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379 lines
205 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
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<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="C22B" definition-exists="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>PRODUCTION AND REFINING OF METALS </text><reference><text>electrolytic <class-ref scheme="cpc">C25</class-ref></text></reference></title-part><title-part><text>PRETREATMENT OF RAW MATERIALS</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In this subclass, groups for obtaining metals include obtaining the metals by non-metallurgical processes, and obtaining metal compounds by metallurgical processes, <CPC-specific-note>as far as specifically indicated in the relevant groups</CPC-specific-note> . Thus, for example, group <class-ref scheme="cpc">C22B11/00</class-ref> covers the production of silver by reduction of ammoniacal silver oxide in solution, and group <class-ref scheme="cpc">C22B17/00</class-ref> includes the production of cadmium oxide by a metallurgical process. Furthermore, although compounds of arsenic and antimony are classified in <class-ref scheme="cpc">C01G</class-ref>, production of the elements themselves is included in <class-ref scheme="cpc">C22B</class-ref>, as well as the production of their compounds by metallurgical processes. </note-paragraph></note><note type="warning"><note-paragraph warning-type="ipc-not-used">The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups: <table><row><entry><class-ref scheme="ipc">C22B9/187</class-ref> - <class-ref scheme="ipc">C22B9/193</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">C22B9/18</class-ref></entry></row><row><entry><class-ref scheme="ipc">C22B9/21</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">C22B9/20</class-ref></entry></row><row><entry><class-ref scheme="ipc">C22B15/02</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">C22B15/0032</class-ref></entry></row><row><entry><class-ref scheme="ipc">C22B15/04</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">C22B15/0036</class-ref></entry></row><row><entry><class-ref scheme="ipc">C22B15/06</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">C22B15/0041</class-ref>, <class-ref scheme="cpc">C22B15/0043</class-ref></entry></row><row><entry><class-ref scheme="ipc">C22B15/14</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">C22B15/006</class-ref></entry></row></table></note-paragraph><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="C22B1/00" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B1/00" definition-exists="true" ipc-concordant="C22B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B1/00</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Preliminary treatment of ores or scrap</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B1/005" definition-exists="false" ipc-concordant="C22B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>C22B1/005</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>Preliminary treatment of scrap </text><reference><text><class-ref scheme="cpc">C22B1/02</class-ref> - <class-ref scheme="cpc">C22B1/26</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B1/02" definition-exists="false" ipc-concordant="C22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Roasting processes </text><reference><text><class-ref scheme="cpc">C22B1/16</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B1/04" definition-exists="false" ipc-concordant="C22B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Blast roasting</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B1/06" definition-exists="false" ipc-concordant="C22B1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sulfating roasting</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B1/08" definition-exists="false" ipc-concordant="C22B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Chloridising roasting</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B1/10" definition-exists="false" ipc-concordant="C22B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in fluidised form</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B1/11" definition-exists="false" ipc-concordant="C22B1/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Removing sulfur, phosphorus or arsenic other than by roasting</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B1/14" definition-exists="false" ipc-concordant="C22B1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Agglomerating</text></title-part><title-part><text>Briquetting</text></title-part><title-part><text>Binding</text></title-part><title-part><text>Granulating</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B1/16" definition-exists="false" ipc-concordant="C22B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sintering</text></title-part><title-part><text>Agglomerating</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/18" definition-exists="false" ipc-concordant="C22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in sinter pots</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/20" definition-exists="false" ipc-concordant="C22B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in sintering machines with movable grates</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B1/205" definition-exists="false" ipc-concordant="C22B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>regulation of the sintering process</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/212" definition-exists="false" ipc-concordant="C22B1/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/212</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in tunnel furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/214" definition-exists="false" ipc-concordant="C22B1/214" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/214</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in shaft furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/216" definition-exists="false" ipc-concordant="C22B1/216" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/216</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in rotary furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/22" definition-exists="false" ipc-concordant="C22B1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in other sintering apparatus</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B1/24" definition-exists="false" ipc-concordant="C22B1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B1/24</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Binding</text></title-part><title-part><text>Briquetting </text><CPC-specific-text><text>; Granulating</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/2406" definition-exists="false" ipc-concordant="C22B1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/2406</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>pelletizing</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/2413" definition-exists="false" ipc-concordant="C22B1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/2413</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>enduration of pellets</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/242" definition-exists="false" ipc-concordant="C22B1/242" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/242</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with binders</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B1/243" definition-exists="false" ipc-concordant="C22B1/243" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/243</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>inorganic</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B1/244" definition-exists="false" ipc-concordant="C22B1/244" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/244</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>organic</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B1/245" definition-exists="false" ipc-concordant="C22B1/245" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/245</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with carbonaceous material for the production of coked agglomerates</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B1/248" definition-exists="false" ipc-concordant="C22B1/248" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/248</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of metal scrap or alloys</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B1/26" definition-exists="false" ipc-concordant="C22B1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B1/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cooling of roasted, sintered, or agglomerated ores</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B3/00" definition-exists="true" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Extraction of metal compounds from ores or concentrates by wet processes</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> When classifying in this group, the nature of any metal which is considered to represent information of interest for search may also be classified in the main groups only of <class-ref scheme="cpc">C22B11/00</class-ref> - <class-ref scheme="cpc">C22B25/00</class-ref>, in group <class-ref scheme="cpc">C22B19/34</class-ref> or in any of groups <class-ref scheme="cpc">C22B26/00</class-ref> - <class-ref scheme="cpc">C22B61/00</class-ref>. This can for example, be the case when it is considered of interest to enable searching for extraction of specific metals or their compounds. Such non-obligatory classification should be given as "additional information".</note-paragraph><note-paragraph><CPC-specific-note>This group <u>covers</u> methods directed to the extraction of three or more metals. For the recovery of one or two metals, see the other groups of this subclass concerning these metals</CPC-specific-note></note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B3/02" definition-exists="false" ipc-concordant="C22B3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Apparatus therefor</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B3/04" definition-exists="false" ipc-concordant="C22B3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by leaching </text><reference><text><class-ref scheme="cpc">C22B3/18</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/045" definition-exists="false" ipc-concordant="C22B3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching using electrochemical processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/06" definition-exists="false" ipc-concordant="C22B3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B3/06</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in inorganic acid solutions </text><CPC-specific-text><text>, e.g. with acids generated <u>in situ</u>; in inorganic salt solutions other than ammonium salt solutions</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/065" definition-exists="false" ipc-concordant="C22B3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Nitric acids or salts thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/08" definition-exists="false" ipc-concordant="C22B3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B3/08</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Sulfuric acid </text><CPC-specific-text><text>, other sulfurated acids or salts thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/10" definition-exists="false" ipc-concordant="C22B3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B3/10</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Hydrochloric acid </text><CPC-specific-text><text>, other halogenated acids or salts thereof</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/12" definition-exists="false" ipc-concordant="C22B3/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in inorganic alkaline solutions</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/14" definition-exists="false" ipc-concordant="C22B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>containing ammonia or ammonium salts</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/16" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in organic solutions</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/1608" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with acyclic or carbocyclic agents</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/1616" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1616</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with acyclic or carbocyclic agents of a single type</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/1625" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1625</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with amines </text><reference><text>amino acids <class-ref scheme="cpc">C22B3/165</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/1633" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1633</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with oximes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/1641" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1641</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with ketones or aldehydes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/165" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with organic acids</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/1658" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1658</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with acyclic or carbocyclic agents of different types in admixture, e.g. with organic acids added to oximes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/1666" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1666</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with heterocyclic compounds</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/1675" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1675</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with a mixture of organic agents wherein one agent at least is a heterocyclic compounds </text><reference><text><class-ref scheme="cpc">C22B3/1683</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/1683" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1683</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with organo-metallic compounds</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/1691" definition-exists="false" ipc-concordant="C22B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/1691</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching with a mixture of organic agents wherein at least one agent is an organo-metallic compound</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B3/18" definition-exists="false" ipc-concordant="C22B3/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B3/18</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>with the aid of microorganisms or enzymes, e.g. bacteria or algae</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B3/20" definition-exists="false" ipc-concordant="C22B3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treatment or purification of solutions, e.g. obtained by leaching </text><reference><text><class-ref scheme="cpc">C22B3/18</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/205" definition-exists="false" ipc-concordant="C22B3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using adducts or inclusion complexes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/22" definition-exists="false" ipc-concordant="C22B3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/22</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>by physical processes, e.g. by filtration, by magnetic means </text><CPC-specific-text><text>, or by thermal decomposition</text></CPC-specific-text><text> </text><reference><text>treatment or purification of solutions by liquid-liquid extraction <class-ref scheme="cpc">C22B3/26</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/24" definition-exists="false" ipc-concordant="C22B3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by adsorption on solid substances, e.g. by extraction with solid resins</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">C22B3/24</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">C22B3/42</class-ref>.<br/>Groups <class-ref scheme="cpc">C22B3/24</class-ref> and <class-ref scheme="cpc">C22B3/42</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/26" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/26</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>by liquid-liquid extraction using organic compounds</text></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph>In groups <CPC-specific-note><class-ref scheme="cpc">C22B3/262</class-ref> - <class-ref scheme="cpc">C22B3/41</class-ref>:</CPC-specific-note><subnote type="alpha"><note-paragraph>the last place priority rule is applied, i.e. at each hierarchical level, in the absence of an indication to the contrary, compounds are classified in the last appropriate place;</note-paragraph><note-paragraph>when two or more compounds are used successively, each compound is classified as such;</note-paragraph><note-paragraph>mixtures containing two or more compounds covered individually by the same one of groups <CPC-specific-note><class-ref scheme="cpc">C22B3/262</class-ref> - <class-ref scheme="cpc">C22B3/387</class-ref>,</CPC-specific-note> are classified only in that group.</note-paragraph></subnote></note-paragraph></note><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">C22B3/26</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">C22B3/40</class-ref>.<br/>Groups <class-ref scheme="cpc">C22B3/26</class-ref> and <class-ref scheme="cpc">C22B3/40</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/262" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/262</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>using alcohols or phenols</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/28" definition-exists="false" ipc-concordant="C22B3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/28</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Amines</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/282" definition-exists="false" ipc-concordant="C22B3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/282</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Aliphatic amines</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/284" definition-exists="false" ipc-concordant="C22B3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/284</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Aromatic amines</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/286" definition-exists="false" ipc-concordant="C22B3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/286</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Amino-alcohols</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/288" definition-exists="false" ipc-concordant="C22B3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/288</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Quaternary ammonium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/30" definition-exists="false" ipc-concordant="C22B3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/30</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Oximes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/302" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/302</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Ethers or epoxides</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/304" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/304</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Crown ethers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/306" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/306</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Ketones or aldehydes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/32" definition-exists="false" ipc-concordant="C22B3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/32</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Carboxylic acids</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/322" definition-exists="false" ipc-concordant="C22B3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/322</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Oxalic acids</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/324" definition-exists="false" ipc-concordant="C22B3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/324</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Naphthenic acids</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/326" definition-exists="false" ipc-concordant="C22B3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/326</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Ramified chain carboxylic acids or derivatives thereof, e.g. "versatic" acids</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/33" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/33</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Cyanic acids, derivatives thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/34" definition-exists="false" ipc-concordant="C22B3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/34</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>containing sulfur </text><CPC-specific-text><text>, e.g. sulfonium</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/36" definition-exists="false" ipc-concordant="C22B3/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/36</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Heterocyclic compounds </text><reference><text><class-ref scheme="cpc">C22B3/34</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/362" definition-exists="false" ipc-concordant="C22B3/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/362</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Heterocyclic compounds of a single type</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/364" definition-exists="false" ipc-concordant="C22B3/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/364</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Quinoline</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/37" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/37</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>containing boron, silicon, selenium or tellurium</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/38" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/38</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>containing phosphorus</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/381" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/381</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Phosphines, e.g. compounds with the formula PR<sub>n</sub>H<sub>3-n</sub>, with n = 0-3</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/382" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/382</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Phosphine chalcogenides, e.g. compounds of the formula R<sub>3</sub>P=X with X = O, S, Se or Te</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/383" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/383</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Tervalent phosphorus oxyacids, esters thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/384" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/384</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Pentavalent phosphorus oxyacids, esters thereof</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/3842" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/3842</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Phosphinic acid, e.g. H<sub>2</sub>P(O)(OH)</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/3844" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/3844</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Phosphonic acid, e.g. H<sub>2</sub>P(O)(OH)<sub>2</sub></text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/3846" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/3846</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Phosphoric acid, e.g. (O)P(OH)<sub>3</sub></text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/385" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/385</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Thiophosphoric acids, or esters thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/386" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/386</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Polyphosphoric oxyacids, or derivatives thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/387" definition-exists="false" ipc-concordant="C22B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/387</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Cyclic or polycyclic compounds</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/40" definition-exists="false" ipc-concordant="C22B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/40</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Mixtures</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">C22B3/40</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">C22B3/26</class-ref>.<br/>Groups <class-ref scheme="cpc">C22B3/26</class-ref> and <class-ref scheme="cpc">C22B3/40</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/402" definition-exists="false" ipc-concordant="C22B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/402</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>of acyclic or carbocyclic compounds of different types</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B3/404" definition-exists="false" ipc-concordant="C22B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/404</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>of organic acids and oximes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/406" definition-exists="false" ipc-concordant="C22B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/406</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>at least one compound thereof being a heterocyclic compound</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/408" definition-exists="false" ipc-concordant="C22B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/408</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>using a mixture of phosphorus-based acid derivatives of different types</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B3/409" definition-exists="false" ipc-concordant="C22B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/409</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>at least one compound being an organo-metallic compound</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/41" definition-exists="false" ipc-concordant="C22B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/41</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>using a solution of normally solid organic compounds, e.g. dissolved polymers, sugars, or the like</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/42" definition-exists="false" ipc-concordant="C22B3/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by ion-exchange extraction</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">C22B3/42</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">C22B3/24</class-ref>.<br/>Groups <class-ref scheme="cpc">C22B3/24</class-ref> and <class-ref scheme="cpc">C22B3/42</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B3/44" definition-exists="false" ipc-concordant="C22B3/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B3/44</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>by chemical processes </text><reference><text>treatment or purification of solutions by liquid-liquid extraction <class-ref scheme="cpc">C22B3/26</class-ref>, by ion-exchange extraction <class-ref scheme="cpc">C22B3/42</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B3/46" definition-exists="false" ipc-concordant="C22B3/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B3/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by substitution, e.g. by cementation</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B4/00" definition-exists="true" ipc-concordant="C22B4/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B4/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys </text><reference><text>obtaining iron or steel <class-ref scheme="cpc">C21B</class-ref>, <class-ref scheme="cpc">C21C</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B4/005" definition-exists="false" ipc-concordant="C22B4/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B4/005</classification-symbol><class-title date-revised="2017-08-01"><title-part><CPC-specific-text><text>using plasma jets </text><reference><text>smelting, remelting, refining of metals using a plasma as heat source <class-ref scheme="cpc">C22B9/22</class-ref>; generating or handling plasma in general <class-ref scheme="cpc">H05H1/00</class-ref>; gas-filled discharge tubes for processing materials in general <class-ref scheme="cpc">H01J37/32</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B4/02" definition-exists="false" ipc-concordant="C22B4/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B4/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Light metals </text><CPC-specific-text><reference><text><class-ref scheme="cpc">C22B4/005</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B4/04" definition-exists="false" ipc-concordant="C22B4/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B4/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heavy metals </text><CPC-specific-text><reference><text><class-ref scheme="cpc">C22B4/005</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B4/06" definition-exists="false" ipc-concordant="C22B4/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B4/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Alloys </text><CPC-specific-text><reference><text><class-ref scheme="cpc">C22B4/005</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B4/08" definition-exists="false" ipc-concordant="C22B4/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B4/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Apparatus </text><reference><CPC-specific-text><text><class-ref scheme="cpc">C22B4/005</class-ref> takes precedence; </text></CPC-specific-text><text> electric heating elements <class-ref scheme="cpc">H05B</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B5/00" definition-exists="true" ipc-concordant="C22B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>General methods of reducing to metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B5/02" definition-exists="false" ipc-concordant="C22B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dry methods </text><CPC-specific-text><text>smelting of sulfides or formation of mattes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/04" definition-exists="false" ipc-concordant="C22B5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by aluminium, other metals or silicon</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/06" definition-exists="false" ipc-concordant="C22B5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by carbides or the like</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/08" definition-exists="false" ipc-concordant="C22B5/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by sulfides</text></title-part><title-part><text>Roasting reaction methods</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/10" definition-exists="false" ipc-concordant="C22B5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by solid carbonaceous reducing agents</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/12" definition-exists="false" ipc-concordant="C22B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by gases</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B5/14" definition-exists="false" ipc-concordant="C22B5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>fluidised material</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/16" definition-exists="false" ipc-concordant="C22B5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with volatilisation or condensation of the metal being produced</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/18" definition-exists="false" ipc-concordant="C22B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing step-by-step</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B5/20" definition-exists="false" ipc-concordant="C22B5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B5/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>from metal carbonyls</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B7/00" definition-exists="true" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; </text><CPC-specific-text><text>Methods of a general interest or applied to the winning of more than two metals </text><reference><text>briquetting of scrap <class-ref scheme="cpc">C22B1/248</class-ref>; preliminary treatment of scrap <class-ref scheme="cpc">C22B1/005</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B7/001" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Dry processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B7/002" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by treating with halogens, sulfur or compounds thereof; by carburising, by treating with hydrogen (hydriding)</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B7/003" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>only remelting, e.g. of chips, borings, turnings; apparatus used therefor</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B7/004" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>C22B7/004</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>separating two or more metals by melting out (liquation), i.e. heating above the temperature of the lower melting metal component(s); by fractional crystallisation (controlled freezing)</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B7/005" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Separation by a physical processing technique only, e.g. by mechanical breaking</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B7/006" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Wet processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B7/007" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by acid leaching</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B7/008" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by an alkaline or ammoniacal leaching</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B7/009" definition-exists="false" ipc-concordant="C22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>C22B7/009</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>General processes for recovering metals or metallic compounds from spent catalysts </text><reference><text>for recovering specific metals <class-ref scheme="cpc">C22B11/00</class-ref> - <class-ref scheme="cpc">C22B61/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B7/02" definition-exists="false" ipc-concordant="C22B7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Working-up flue dust</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B7/04" definition-exists="false" ipc-concordant="C22B7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Working-up slag</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B9/00" definition-exists="true" ipc-concordant="C22B9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>General processes of refining or remelting of metals</text></title-part><title-part><text>Apparatus for electroslag or arc remelting of metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/003" definition-exists="false" ipc-concordant="C22B9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by induction</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/006" definition-exists="false" ipc-concordant="C22B9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with use of an inert protective material including the use of an inert gas</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/02" definition-exists="false" ipc-concordant="C22B9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action </text><CPC-specific-text><text>including acoustic waves; </text><reference><text><class-ref scheme="cpc">C22B9/003</class-ref>, <class-ref scheme="cpc">C22B9/006</class-ref>, <class-ref scheme="cpc">C22B9/05</class-ref>, <class-ref scheme="cpc">C22B9/22</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/023" definition-exists="false" ipc-concordant="C22B9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>By filtering </text><reference><text>filtration of aluminium <class-ref scheme="cpc">C22B21/066</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/026" definition-exists="false" ipc-concordant="C22B9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by acoustic waves, e.g. supersonic waves</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/04" definition-exists="false" ipc-concordant="C22B9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining by applying a vacuum</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/05" definition-exists="false" ipc-concordant="C22B9/05" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining by treating with gases, e.g. gas flushing </text><CPC-specific-text><text>also refining by means of a material generating gas <u>in situ</u></text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/055" definition-exists="false" ipc-concordant="C22B9/05" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/055</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>while the metal is circulating, e.g. combined with filtration</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/10" definition-exists="false" ipc-concordant="C22B9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B9/10</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>with refining or fluxing agents</text></title-part><title-part><text>Use of materials therefor, </text><CPC-specific-text><text>e.g. slagging or scorifying agents</text></CPC-specific-text><reference><text><class-ref scheme="cpc">C22B9/18</class-ref> takes precedence</text></reference><CPC-specific-text><reference><text><class-ref scheme="cpc">C22B9/006</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/103" definition-exists="false" ipc-concordant="C22B9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Methods of introduction of solid or liquid refining or fluxing agents</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/106" definition-exists="false" ipc-concordant="C22B9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the refining being obtained by intimately mixing the molten metal with a molten salt or slag</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/14" definition-exists="false" ipc-concordant="C22B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining in the solid state</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B9/16" definition-exists="false" ipc-concordant="C22B9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Remelting metals </text><reference><text>liquating <class-ref scheme="cpc">C22B9/02</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/18" definition-exists="false" ipc-concordant="C22B9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Electroslag remelting </text><CPC-specific-text><reference><text>electroslag casting <class-ref scheme="cpc">B22D23/10</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/20" definition-exists="false" ipc-concordant="C22B9/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arc remelting</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B9/22" definition-exists="false" ipc-concordant="C22B9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B9/22</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>with heating by wave energy or particle radiation </text><CPC-specific-text><reference><text>by acoustic waves <class-ref scheme="cpc">C22B9/026</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B9/221" definition-exists="false" ipc-concordant="C22B9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by electromagnetic waves, e.g. by gas discharge lamps</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B9/223" definition-exists="false" ipc-concordant="C22B9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/223</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by laser beams </text><reference><text>working by laser beam <class-ref scheme="cpc">B23K26/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B9/225" definition-exists="false" ipc-concordant="C22B9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/225</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by microwaves</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B9/226" definition-exists="false" ipc-concordant="C22B9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by electric discharge, e.g. plasma </text><reference><text><class-ref scheme="cpc">C22B9/20</class-ref> takes precedence; apparatus therefor <class-ref scheme="cpc">H01J</class-ref>, <class-ref scheme="cpc">H05B</class-ref>, <class-ref scheme="cpc">H05H</class-ref>; chemical reactions with metals in a plasma <class-ref scheme="cpc">C22B4/005</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B9/228" definition-exists="false" ipc-concordant="C22B9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B9/228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by particle radiation, e.g. electron beams</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B11/00" definition-exists="true" ipc-concordant="C22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining noble metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B11/02" definition-exists="false" ipc-concordant="C22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by dry processes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B11/021" definition-exists="false" ipc-concordant="C22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Recovery of noble metals from waste materials</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B11/023" definition-exists="false" ipc-concordant="C22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B11/025" definition-exists="false" ipc-concordant="C22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from manufactured products, e.g. from printed circuit boards, from photographic films, paper, or baths</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B11/026" definition-exists="false" ipc-concordant="C22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B11/028" definition-exists="false" ipc-concordant="C22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using solid sorbents, e.g. getters or catchment gauzes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B11/04" definition-exists="false" ipc-concordant="C22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B11/04</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>by wet processes </text><reference><text>extraction of metal compounds by leaching in organic solutions <class-ref scheme="cpc">C22B3/16</class-ref>; treatment or purification of solutions by liquid-liquid extraction <class-ref scheme="cpc">C22B3/26</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B11/042" definition-exists="false" ipc-concordant="C22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B11/042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Recovery of noble metals from waste materials</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B11/044" definition-exists="false" ipc-concordant="C22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B11/044</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B11/046" definition-exists="false" ipc-concordant="C22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B11/046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B11/048" definition-exists="false" ipc-concordant="C22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B11/048</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B11/06" definition-exists="false" ipc-concordant="C22B11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B11/06</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Chloridising</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B11/08" definition-exists="false" ipc-concordant="C22B11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by cyaniding</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B11/10" definition-exists="false" ipc-concordant="C22B11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by amalgamating</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B11/12" definition-exists="false" ipc-concordant="C22B11/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B11/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Apparatus therefor</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B13/00" definition-exists="true" ipc-concordant="C22B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining lead</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B13/02" definition-exists="false" ipc-concordant="C22B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by dry processes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B13/025" definition-exists="false" ipc-concordant="C22B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Recovery from waste materials</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B13/04" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B13/04</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>by wet processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B13/045" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Recovery from waste materials</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B13/06" definition-exists="false" ipc-concordant="C22B13/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B13/08" definition-exists="false" ipc-concordant="C22B13/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Separating metals from lead by precipitating, e.g. Parkes process</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B13/10" definition-exists="false" ipc-concordant="C22B13/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B13/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Separating metals from lead by crystallising, e.g. by Pattison process</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B15/00" definition-exists="true" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining copper</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B15/0002" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Preliminary treatment</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0004" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without modification of the copper constituent</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0006" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by dry processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0008" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by wet processes </text><reference><text>by flotation <class-ref scheme="cpc">B03D</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/001" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with modification of the copper constituent</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0013" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0013</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by roasting</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0015" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Oxidizing roasting</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0017" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0017</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sulfating or sulfiding roasting</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0019" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0019</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Chloridizing roasting </text><reference><text>segregation <class-ref scheme="cpc">C22B15/0023</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0021" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by reducing in gaseous or solid state </text><reference><text>slag reduction <class-ref scheme="cpc">C22B15/0054</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0023" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Segregation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B15/0026" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pyrometallurgy</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0028" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Smelting or converting</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/003" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bath smelting or converting</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0032" definition-exists="false" ipc-concordant="C22B15/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0032</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in shaft furnaces, e.g. blast furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0034" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0034</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in rotary furnaces, e.g. kaldo-type furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0036" definition-exists="false" ipc-concordant="C22B15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in reverberatory furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0039" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0039</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in electric furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0041" definition-exists="false" ipc-concordant="C22B15/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0041</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in converters</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B15/0043" definition-exists="false" ipc-concordant="C22B15/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in rotating converters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0045" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in muffles, crucibles, or closed vessels</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0047" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0047</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>flash smelting or converting</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/005" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in a succession of furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0052" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reduction smelting or converting</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0054" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Slag, slime, speiss, or dross treating</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0056" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0056</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Scrap treating</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0058" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0058</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/006" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>working up of molten copper, e.g. refining</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B15/0063" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hydrometallurgy</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0065" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching or slurrying </text><reference><text>with organic compounds <class-ref scheme="cpc">C22B3/16</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0067" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0067</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with acids or salts thereof</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0069" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0069</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing halogen</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0071" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing sulfur</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0073" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing nitrogen</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B15/0076" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cyanide groups</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0078" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with ammoniacal solutions, e.g. ammonium hydroxide</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/008" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with non-acid solutions containing salts of alkali or alkaline earth metals</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0082" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with water</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0084" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B15/0084</classification-symbol><class-title date-revised="2021-05-01"><title-part><CPC-specific-text><text>Treating solutions </text><reference><text>with organic compounds <class-ref scheme="cpc">C22B3/20</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0086" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by physical methods</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B15/0089" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by chemical methods</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0091" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0091</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by cementation</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B15/0093" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by gases, e.g. hydrogen or hydrogen sulfide</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B15/0095" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0095</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Process control or regulation methods</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B15/0097" definition-exists="false" ipc-concordant="C22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B15/0097</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sulfur release abatement</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B17/00" definition-exists="true" ipc-concordant="C22B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B17/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining cadmium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B17/02" definition-exists="false" ipc-concordant="C22B17/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B17/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by dry processes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B17/04" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B17/04</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>by wet processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B17/06" definition-exists="false" ipc-concordant="C22B17/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B17/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B19/00" definition-exists="true" ipc-concordant="C22B19/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining zinc or zinc oxide</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/02" definition-exists="false" ipc-concordant="C22B19/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Preliminary treatment of ores</text></title-part><title-part><text>Preliminary refining of zinc oxide</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/04" definition-exists="false" ipc-concordant="C22B19/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining zinc by distilling</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/06" definition-exists="false" ipc-concordant="C22B19/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in muffle furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/08" definition-exists="false" ipc-concordant="C22B19/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in blast furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/10" definition-exists="false" ipc-concordant="C22B19/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in reverberatory furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/12" definition-exists="false" ipc-concordant="C22B19/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in crucible furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/14" definition-exists="false" ipc-concordant="C22B19/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in vertical retorts</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/16" definition-exists="false" ipc-concordant="C22B19/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Distilling vessels</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B19/18" definition-exists="false" ipc-concordant="C22B19/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Condensers, Receiving vessels</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/20" definition-exists="false" ipc-concordant="C22B19/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining zinc otherwise than by distilling</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/22" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B19/22</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>with leaching with acids</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/24" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B19/24</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>with leaching with alkaline solutions, e.g. ammonia</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/26" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B19/26</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>Refining solutions containing zinc values, e.g. obtained by leaching zinc ores </text><reference><text>treatment or purification of solutions by liquid-liquid extraction, by ion exchange or by adsorption <class-ref scheme="cpc">C22B3/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/28" definition-exists="false" ipc-concordant="C22B19/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>from muffle furnace residues</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/30" definition-exists="false" ipc-concordant="C22B19/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>from metallic residues or scraps</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/32" definition-exists="false" ipc-concordant="C22B19/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining zinc</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B19/34" definition-exists="false" ipc-concordant="C22B19/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining zinc oxide </text><reference><text>purifying zinc oxide <class-ref scheme="cpc">C01G9/02</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/36" definition-exists="false" ipc-concordant="C22B19/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in blast or reverberatory furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B19/38" definition-exists="false" ipc-concordant="C22B19/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B19/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in rotary furnaces</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B21/00" definition-exists="true" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining aluminium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/0007" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Preliminary treatment of ores or scrap or any other metal source </text><reference><text>Bayer processes <class-ref scheme="cpc">C01F</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/0015" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by wet processes </text><reference><text><class-ref scheme="cpc">C22B21/02</class-ref>, <class-ref scheme="cpc">C22B21/04</class-ref> and <class-ref scheme="cpc">C22B21/06</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/0023" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from waste materials</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B21/003" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/0038" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0038</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by other processes </text><reference><text>electrolysis <class-ref scheme="cpc">C25C</class-ref>; <class-ref scheme="cpc">C22B21/02</class-ref> and <class-ref scheme="cpc">C22B21/04</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/0046" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from aluminium halides</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/0053" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from other aluminium compounds</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B21/0061" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using metals, e.g. Hg or Mn</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/0069" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>C22B21/0069</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents </text><reference><text><class-ref scheme="cpc">C22B21/0046</class-ref>, <class-ref scheme="cpc">C22B21/0053</class-ref> and <class-ref scheme="cpc">C22B21/0092</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B21/0076" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/0084" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>melting and handling molten aluminium </text><reference><text><class-ref scheme="cpc">C22B21/02</class-ref>, <class-ref scheme="cpc">C22B21/04</class-ref> and <class-ref scheme="cpc">C22B21/06</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/0092" definition-exists="false" ipc-concordant="C22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Remelting scrap, skimmings or any secondary source aluminium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/02" definition-exists="false" ipc-concordant="C22B21/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with reducing </text><CPC-specific-text><reference><text><class-ref scheme="cpc">C22B21/04</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/04" definition-exists="false" ipc-concordant="C22B21/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with alkali metals </text><CPC-specific-text><text>earth alkali metals included</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B21/06" definition-exists="false" ipc-concordant="C22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>refining </text><CPC-specific-text><reference><text>electrolytic refining <class-ref scheme="cpc">C25C</class-ref>; <class-ref scheme="cpc">C22B21/0046</class-ref>, <class-ref scheme="cpc">C22B21/0061</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/062" definition-exists="false" ipc-concordant="C22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using salt or fluxing agents </text><reference><text><class-ref scheme="cpc">C22B21/064</class-ref>, <class-ref scheme="cpc">C22B21/066</class-ref>, and <class-ref scheme="cpc">C22B21/068</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/064" definition-exists="false" ipc-concordant="C22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using inert or reactive gases </text><reference><text><class-ref scheme="cpc">C22B21/066</class-ref> and <class-ref scheme="cpc">C22B21/068</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/066" definition-exists="false" ipc-concordant="C22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment of circulating aluminium, e.g. by filtration </text><reference><text><class-ref scheme="cpc">C22B21/068</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B21/068" definition-exists="false" ipc-concordant="C22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B21/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>handling in vacuum</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B23/00" definition-exists="true" ipc-concordant="C22B23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining nickel or cobalt</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B23/005" definition-exists="false" ipc-concordant="C22B23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Preliminary treatment of ores, e.g. by roasting or by the Krupp-Renn process</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B23/02" definition-exists="false" ipc-concordant="C22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by dry processes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/021" definition-exists="false" ipc-concordant="C22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by reduction in solid state, e.g. by segregation processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/023" definition-exists="false" ipc-concordant="C22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with formation of ferro-nickel or ferro-cobalt</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/025" definition-exists="false" ipc-concordant="C22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with formation of a matte or by matte refining or converting into nickel or cobalt, e.g. by the Oxford process </text><reference><text>leaching of mattes <class-ref scheme="cpc">C22B23/04</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/026" definition-exists="false" ipc-concordant="C22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/028" definition-exists="false" ipc-concordant="C22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>separation of nickel from cobalt</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B23/04" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B23/04</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>by wet processes </text><reference><text>recovery or separation of nickel or cobalt using organic agents <class-ref scheme="cpc">C22B3/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/0407" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0407</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Leaching processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B23/0415" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0415</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with acids or salt solutions except ammonium salts solutions</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B23/0423" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0423</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Halogenated acids or salts thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B23/043" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sulfurated acids or salts thereof</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B23/0438" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0438</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Nitric acids or salts thereof</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B23/0446" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0446</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with an ammoniacal liquor or with a hydroxide of an alkali or alkaline-earth metal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/0453" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0453</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment or purification of solutions, e.g. obtained by leaching </text><reference><text><class-ref scheme="cpc">C22B23/0407</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B23/0461" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0461</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by chemical methods</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B23/0469" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0469</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by chemical substitution, e.g. by cementation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/0476" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0476</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Separation of nickel from cobalt</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B23/0484" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0484</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in acidic type solutions</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B23/0492" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/0492</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in ammoniacal type solutions</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B23/06" definition-exists="false" ipc-concordant="C22B23/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B23/06</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Refining</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B23/065" definition-exists="false" ipc-concordant="C22B23/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B23/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>carbonyl methods</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B25/00" definition-exists="true" ipc-concordant="C22B25/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B25/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining tin</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B25/02" definition-exists="false" ipc-concordant="C22B25/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B25/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by dry processes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B25/04" definition-exists="false" ipc-concordant="C22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-11-01" status="published"><classification-symbol>C22B25/04</classification-symbol><class-title date-revised="2016-11-01"><title-part><CPC-specific-text><text>by wet processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B25/06" definition-exists="false" ipc-concordant="C22B25/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B25/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>from scrap, especially tin scrap </text><reference><text>by electrolytic procedure <class-ref scheme="cpc">C25C1/14</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B25/08" definition-exists="false" ipc-concordant="C22B25/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B25/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Refining</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B26/00" definition-exists="true" ipc-concordant="C22B26/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B26/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining alkali, alkaline earth metals or magnesium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B26/10" definition-exists="false" ipc-concordant="C22B26/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B26/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining alkali metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B26/12" definition-exists="false" ipc-concordant="C22B26/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B26/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining lithium</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B26/20" definition-exists="false" ipc-concordant="C22B26/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B26/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining alkaline earth metals or magnesium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B26/22" definition-exists="false" ipc-concordant="C22B26/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B26/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining magnesium</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B30/00" definition-exists="true" ipc-concordant="C22B30/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B30/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining antimony, arsenic or bismuth</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B30/02" definition-exists="false" ipc-concordant="C22B30/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B30/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining antimony</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B30/04" definition-exists="false" ipc-concordant="C22B30/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B30/04</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Obtaining arsenic </text><CPC-specific-text><reference><text>extraction of metal compounds by leaching in organic solutions <class-ref scheme="cpc">C22B3/16</class-ref>; treatment or purification of solutions by adsorption on solids <class-ref scheme="cpc">C22B3/24</class-ref>, by liquid-liquid extraction <class-ref scheme="cpc">C22B3/26</class-ref>, by ion-exchange extraction <class-ref scheme="cpc">C22B3/42</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B30/06" definition-exists="false" ipc-concordant="C22B30/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B30/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining bismuth</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B34/00" definition-exists="true" ipc-concordant="C22B34/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining refractory metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B34/10" definition-exists="false" ipc-concordant="C22B34/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining titanium, zirconium or hafnium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/12" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>C22B34/12</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Obtaining titanium </text><CPC-specific-text><text>or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds <u>see</u> <class-ref scheme="cpc">C01G23/00</class-ref> - <class-ref scheme="cpc">C01G23/08</class-ref></text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/1204" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1204</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1209" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by dry processes, e.g. with selective chlorination of iron or with formation of a titanium bearing slag</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1213" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by wet processes, e.g. using leaching methods or flotation techniques</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/1218" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining titanium or titanium compounds from ores or scrap by dry processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1222" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a halogen containing agent</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1227" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an oxygen containing agent</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1231" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1231</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>treatment or purification of titanium containing products obtained by dry processes, e.g. condensation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/1236" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1236</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/124" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/124</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using acidic solutions or liquors</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B34/1245" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1245</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing a halogen ion as active agent</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B34/125" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing a sulfur ion as active agent</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1254" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1254</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using basic solutions or liquors</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1259" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1259</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>treatment or purification of titanium containing solutions or liquors or slurries </text><reference><text><class-ref scheme="cpc">C01G23/001</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/1263" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1263</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining metallic titanium from titanium compounds, e.g. by reduction </text><reference><text><class-ref scheme="cpc">C22B34/129</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1268" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1268</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using alkali or alkaline-earth metals or amalgams</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B34/1272" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1272</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>reduction of titanium halides, e.g. Kroll process</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1277" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1277</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using other metals, e.g. Al, Si, Mn</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1281" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1281</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using carbon containing agents, e.g. C, CO, carbides </text><reference><text><class-ref scheme="cpc">C22B34/1286</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B34/1286" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1286</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using hydrogen containing agents, e.g. H<sub>2</sub>, CaH<sub>2</sub>, hydrocarbons</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/129" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/129</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining metallic titanium from titanium compounds by dissociation, e.g. thermic dissociation of titanium tetraiodide, or by electrolysis or with the use of an electric arc</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/1295" definition-exists="false" ipc-concordant="C22B34/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/1295</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Refining, melting, remelting, working up of titanium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/14" definition-exists="false" ipc-concordant="C22B34/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B34/14</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Obtaining zirconium or hafnium </text><CPC-specific-text><reference><text>treatment or purification of solutions by liquid-liquid extraction, by ion exchange or by adsorption <class-ref scheme="cpc">C22B3/00</class-ref>, <class-ref scheme="cpc">C01G25/003</class-ref>, <class-ref scheme="cpc">C01G27/003</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B34/20" definition-exists="false" ipc-concordant="C22B34/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining niobium, tantalum or vanadium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/22" definition-exists="false" ipc-concordant="C22B34/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining vanadium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/225" definition-exists="false" ipc-concordant="C22B34/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/225</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/24" definition-exists="false" ipc-concordant="C22B34/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining niobium or tantalum</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B34/30" definition-exists="false" ipc-concordant="C22B34/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining chromium, molybdenum or tungsten</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/32" definition-exists="false" ipc-concordant="C22B34/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining chromium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/325" definition-exists="false" ipc-concordant="C22B34/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/325</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/34" definition-exists="true" ipc-concordant="C22B34/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B34/34</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Obtaining molybdenum </text><CPC-specific-text><reference><text>treatment or purification of solutions by adsorption on solids <class-ref scheme="cpc">C22B3/24</class-ref>, by liquid-liquid extraction <class-ref scheme="cpc">C22B3/26</class-ref>, by ion-exchange extraction <class-ref scheme="cpc">C22B3/42</class-ref>; preparation of molybdenum involving liquid-liquid extraction, adsorption or ion-exchange <class-ref scheme="cpc">C01G39/003</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/345" definition-exists="false" ipc-concordant="C22B34/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B34/36" definition-exists="false" ipc-concordant="C22B34/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining tungsten</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B34/365" definition-exists="false" ipc-concordant="C22B34/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B34/365</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B35/00" definition-exists="false" ipc-concordant="C22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B35/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining beryllium</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B41/00" definition-exists="false" ipc-concordant="C22B41/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B41/00</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Obtaining germanium </text><CPC-specific-text><reference><text>treatment or purification of solutions by adsorption on solids <class-ref scheme="cpc">C22B3/24</class-ref>, by liquid-liquid extraction <class-ref scheme="cpc">C22B3/26</class-ref>, by ion-exchange extraction <class-ref scheme="cpc">C22B3/42</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B43/00" definition-exists="false" ipc-concordant="C22B43/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B43/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining mercury</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B47/00" definition-exists="true" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining manganese</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B47/0009" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from spent catalysts</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B47/0018" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treating ocean floor nodules</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B47/0027" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Preliminary treatment</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B47/0036" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by dry processes, e.g. smelting</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B47/0045" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by wet processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B47/0054" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>leaching processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B47/0063" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with acids or salt solutions </text><reference><text><class-ref scheme="cpc">C22B47/0072</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B47/0072" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with an ammoniacal liquor or with a hydroxide of an alkali or alkaline-earth metal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B47/0081" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/0081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment or purification of solutions, e.g. obtained by leaching </text><reference><text><class-ref scheme="cpc">C22B47/0054</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B47/009" definition-exists="false" ipc-concordant="C22B47/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B47/009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>refining, e.g. separation of metals obtained by the above methods</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B58/00" definition-exists="false" ipc-concordant="C22B58/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-05-01" status="published"><classification-symbol>C22B58/00</classification-symbol><class-title date-revised="2021-05-01"><title-part><text>Obtaining gallium or indium </text><CPC-specific-text><reference><text>treatment or purification of solutions by liquid-liquid extraction, by ion-exchange or by adsorption <class-ref scheme="cpc">C22B3/20</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B59/00" definition-exists="false" ipc-concordant="C22B59/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B59/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining rare earth metals</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B60/00" definition-exists="true" ipc-concordant="C22B60/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining metals of atomic number 87 or higher, i.e. radioactive metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C22B60/02" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining thorium, uranium, or other actinides</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B60/0204" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0204</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining uranium</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B60/0208" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0208</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>preliminary treatment of ores or scrap</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B60/0213" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by dry processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B60/0217" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0217</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by wet processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B60/0221" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by leaching</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B60/0226" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using acidic solutions or liquors</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/023" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>halogenated ion as active agent</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/0234" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0234</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>sulfurated ion as active agent</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/0239" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0239</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>nitric acid containing ion as active agent</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/0243" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0243</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>phosphorated ion as active agent</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B60/0247" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0247</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using basic solutions or liquors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C22B60/0252" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0252</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>treatment or purification of solutions or of liquors or of slurries </text><reference><text><class-ref scheme="cpc">C22B60/0221</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B60/0256" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C22B60/0256</classification-symbol><class-title date-revised="2017-08-01"><title-part><CPC-specific-text><text>using biological agents, e.g. microorganisms or algae</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B60/026" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>liquid-liquid extraction with or without dissolution in organic solvents</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B60/0265" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0265</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>extraction by solid resins</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/0269" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0269</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Extraction by activated carbon containing adsorbents</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/0273" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0273</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Extraction by titanium containing adsorbents, e.g. by hydrous titanium oxide </text><reference><text><class-ref scheme="cpc">C22B60/0269</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C22B60/0278" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>C22B60/0278</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>by chemical methods </text><reference><text><class-ref scheme="cpc">C22B60/0256</class-ref>, <class-ref scheme="cpc">C22B60/026</class-ref>, <class-ref scheme="cpc">C22B60/0265</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C22B60/0282" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0282</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Solutions containing P ions, e.g. treatment of solutions resulting from the leaching of phosphate ores or recovery of uranium from wet-process phosphoric acid</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C22B60/0286" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0286</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>refining, melting, remelting, working up uranium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B60/0291" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0291</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining thorium</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B60/0295" definition-exists="false" ipc-concordant="C22B60/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/0295</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining other actinides except plutonium</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C22B60/04" definition-exists="false" ipc-concordant="C22B60/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B60/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining plutonium</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C22B61/00" definition-exists="true" ipc-concordant="C22B61/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C22B61/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Obtaining metals not elsewhere provided for in this subclass </text><reference><text>iron <class-ref scheme="cpc">C21</class-ref></text></reference></title-part></class-title></classification-item></classification-item></classification-item></class-scheme> |