ZSI_Reconnect_China/PATSTAT/CPC_data/CPCSchemeXML202302/cpc-scheme-C21B.xml

<?xml version="1.0" encoding="UTF-8"?>
<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="C21B" definition-exists="true" date-revised="2019-01-01" status="published"><classification-symbol>C21B</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>MANUFACTURE OF IRON OR STEEL </text><reference><text>preliminary treatment of ferrous ores or scrap <class-ref scheme="cpc">C22B1/00</class-ref>; electric heating <class-ref scheme="cpc">H05B</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This subclass <u>covers</u>:  <subnote type="bullet"><note-paragraph>the production of iron or steel from source materials, e.g. the production of pig-iron; </note-paragraph><note-paragraph>apparatus specially adapted therefor, e.g. blast furnaces or air heaters.  </note-paragraph></subnote></note-paragraph></note><note type="warning"><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>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="C21B3/00" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/00</classification-symbol>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B3/00" definition-exists="false" ipc-concordant="C21B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>General features in the manufacture of pig-iron </text><reference><text>mixers for pig-iron <class-ref scheme="cpc">C21C1/06</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B3/02" definition-exists="true" ipc-concordant="C21B3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by applying additives, e.g. fluxing agents</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B3/04" definition-exists="true" ipc-concordant="C21B3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Recovery of by-products, e.g. slag</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B3/06" definition-exists="true" ipc-concordant="C21B3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treatment of liquid slag </text><reference><text>slag wool <class-ref scheme="cpc">C03B</class-ref>; slag stones <class-ref scheme="cpc">C04B</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B3/08" definition-exists="true" ipc-concordant="C21B3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cooling slag</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B3/10" definition-exists="false" ipc-concordant="C21B3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Slag pots</text></title-part><title-part><text>Slag cars</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B5/00" definition-exists="true" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making pig-iron in the blast furnace</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/001" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injecting additional fuel or reducing agents</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B5/002" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Heated electrically (plasma)</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B5/003" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injection of pulverulent coal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B5/004" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injection of slurries</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B5/005" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B2005/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Selection or treatment of the reducing gases</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/006" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Automatically controlling the process</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/007" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Conditions of the cokes or characterised by the cokes used</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/008" definition-exists="false" ipc-concordant="C21B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Composition or distribution of the charge</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/02" definition-exists="false" ipc-concordant="C21B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B5/023" definition-exists="false" ipc-concordant="C21B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injection of the additives into the melting part</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B5/026" definition-exists="false" ipc-concordant="C21B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of plastic material</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/04" definition-exists="false" ipc-concordant="C21B5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making slag of special composition</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B5/06" definition-exists="true" ipc-concordant="C21B5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21B5/06</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>using top gas in the blast furnace process </text><reference><text>in coke ovens <class-ref scheme="cpc">C10B</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B7/00" definition-exists="true" ipc-concordant="C21B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Blast furnaces </text><reference><text>lifts associated with blast furnaces <class-ref scheme="cpc">B66B9/06</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/002" definition-exists="false" ipc-concordant="C21B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Evacuating and treating of exhaust gases</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/005" definition-exists="false" ipc-concordant="C21B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bleeder valves or slides</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/007" definition-exists="false" ipc-concordant="C21B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling or regulating of the top pressure</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/02" definition-exists="false" ipc-concordant="C21B7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Internal forms</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/04" definition-exists="true" ipc-concordant="C21B7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with special refractories </text><reference><text>refractory materials <class-ref scheme="cpc">C04B</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/06" definition-exists="true" ipc-concordant="C21B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Linings for furnaces</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/08" definition-exists="false" ipc-concordant="C21B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Top armourings</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/10" definition-exists="true" ipc-concordant="C21B7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cooling</text></title-part><title-part><text>Devices therefor</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/103" definition-exists="false" ipc-concordant="C21B7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Detection of leakages of the cooling liquid</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/106" definition-exists="false" ipc-concordant="C21B7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cooling of the furnace bottom</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/12" definition-exists="true" ipc-concordant="C21B7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Opening or sealing the tap holes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/125" definition-exists="false" ipc-concordant="C21B7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Refractory plugging mass</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/14" definition-exists="true" ipc-concordant="C21B7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Discharging devices, e.g. for slag</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/16" definition-exists="true" ipc-concordant="C21B7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Tuy&#233;res</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/163" definition-exists="false" ipc-concordant="C21B7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/163</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Blowpipe assembly</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/166" definition-exists="false" ipc-concordant="C21B7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/166</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tuyere replacement apparatus</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/18" definition-exists="false" ipc-concordant="C21B7/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bell-and-hopper arrangements</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B7/20" definition-exists="true" ipc-concordant="C21B7/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>C21B7/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with appliances for distributing the burden</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B7/205" definition-exists="false" ipc-concordant="C21B7/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>C21B7/205</classification-symbol><class-title date-revised="2018-08-01"><title-part><CPC-specific-text><text>Details concerning the gear-box driving the charge distribution system</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/22" definition-exists="true" ipc-concordant="C21B7/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dust arresters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B7/24" definition-exists="true" ipc-concordant="C21B7/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B7/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Test rods or other checking devices</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B9/00" definition-exists="false" ipc-concordant="C21B9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stoves for heating the blast in blast furnaces</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B9/02" definition-exists="false" ipc-concordant="C21B9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Brick hot-blast stoves</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B9/04" definition-exists="false" ipc-concordant="C21B9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with combustion shaft</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B9/06" definition-exists="false" ipc-concordant="C21B9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Linings</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B9/08" definition-exists="false" ipc-concordant="C21B9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Iron hot-blast stoves</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B9/10" definition-exists="false" ipc-concordant="C21B9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Other details, e.g. blast mains</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B9/12" definition-exists="false" ipc-concordant="C21B9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hot-blast valves or slides for blast furnaces </text><reference><text>valves in general <class-ref scheme="cpc">F16K</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B9/14" definition-exists="false" ipc-concordant="C21B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Preheating the combustion air</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B9/16" definition-exists="false" ipc-concordant="C21B9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cooling or drying the hot-blast</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B11/00" definition-exists="false" ipc-concordant="C21B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making pig-iron other than in blast furnaces</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B11/02" definition-exists="false" ipc-concordant="C21B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in low shaft furnaces </text><CPC-specific-text><text>or shaft furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B11/06" definition-exists="false" ipc-concordant="C21B11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B11/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in rotary kilns</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B11/08" definition-exists="false" ipc-concordant="C21B11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in hearth-type furnaces</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B11/10" definition-exists="false" ipc-concordant="C21B11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B11/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in electric furnaces</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B13/00" definition-exists="true" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making spongy iron or liquid steel, by direct processes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/0006" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtaining iron or steel in a molten state</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/0013" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0013</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>introduction of iron oxide into a bath of molten iron containing a carbon reductant</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B13/002" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reduction of iron ores by passing through a heated column of carbon</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/0026" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>introduction of iron oxide in the flame of a burner or a hot gas stream</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/0033" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0033</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>In fluidised bed furnaces or apparatus containing a dispersion of the material</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/004" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in a continuous way by reduction from ores</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/0046" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>making metallised agglomerates or iron oxide</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/0053" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>On a massing grate</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/006" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Starting from ores containing non ferrous metallic oxides</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/0066" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Preliminary conditioning of the solid carbonaceous reductant</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/0073" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Selection or treatment of the reducing gases</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/008" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Use of special additives or fluxing agents</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/0086" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Conditioning, transformation of reduced iron ores</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/0093" definition-exists="false" ipc-concordant="C21B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/0093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protecting against oxidation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/02" definition-exists="false" ipc-concordant="C21B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>C21B13/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in shaft furnaces</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/023" definition-exists="false" ipc-concordant="C21B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>wherein iron or steel is obtained in a molten state</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21B13/026" definition-exists="false" ipc-concordant="C21B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>heated electrically</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/029" definition-exists="false" ipc-concordant="C21B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>C21B13/029</classification-symbol><class-title date-revised="2017-05-01"><title-part><CPC-specific-text><text>Introducing coolant gas in the shaft furnaces</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/04" definition-exists="false" ipc-concordant="C21B13/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in retorts</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/06" definition-exists="false" ipc-concordant="C21B13/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in multi-storied furnaces</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/08" definition-exists="false" ipc-concordant="C21B13/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in rotary furnaces</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/085" definition-exists="false" ipc-concordant="C21B13/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>wherein iron or steel is obtained in a molten state</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/10" definition-exists="true" ipc-concordant="C21B13/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in hearth-type furnaces</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/105" definition-exists="false" ipc-concordant="C21B13/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rotary hearth-type furnaces</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/12" definition-exists="true" ipc-concordant="C21B13/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in electric furnaces</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/125" definition-exists="false" ipc-concordant="C21B13/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>By using plasma</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B13/14" definition-exists="true" ipc-concordant="C21B13/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multi-stage processes </text><CPC-specific-text><text>processes carried out in different vessels or furnaces</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/143" definition-exists="false" ipc-concordant="C21B13/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injection of partially reduced ore into a molten bath</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21B13/146" definition-exists="false" ipc-concordant="C21B13/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B13/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multi-step reduction without melting</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21B15/00" definition-exists="true" ipc-concordant="C21B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Other processes for the manufacture of iron from iron compounds </text><reference><text>general methods of reducing to metal <class-ref scheme="cpc">C22B5/00</class-ref>; by electrolysis <class-ref scheme="cpc">C25C1/06</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B15/003" definition-exists="false" ipc-concordant="C21B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B15/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>By using nuclear energy</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B15/006" definition-exists="false" ipc-concordant="C21B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B15/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>By a chloride process</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B15/02" definition-exists="false" ipc-concordant="C21B15/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B15/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Metallothermic processes, e.g. thermit reduction</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21B15/04" definition-exists="false" ipc-concordant="C21B15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B15/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>from iron carbonyl</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="C21B100/00" date-revised="2013-01-01" status="published"><classification-symbol>C21B2100/00</classification-symbol>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21B100/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>C21B2100/00</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Handling of exhaust gases produced during the manufacture of iron or steel</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B100/20" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>C21B2100/20</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Increasing the gas reduction potential of recycled exhaust gases</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/22" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/22</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>by reforming</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/24" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/24</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>by shift reactions</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/26" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/26</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>by adding additional fuel in recirculation pipes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/28" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/28</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>by separation</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B100/284" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/284</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>of nitrogen</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/42" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/42</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Sulphur removal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/44" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/44</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Removing particles, e.g. by scrubbing, dedusting</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B100/60" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>C21B2100/60</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Process control or energy utilisation in the manufacture of iron or steel</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/62" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/62</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/64" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/64</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Controlling the physical properties of the gas, e.g. pressure or temperature</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B100/66" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2100/66</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Heat exchange</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B100/80" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>C21B2100/80</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Interaction of exhaust gases produced during the manufacture of iron or steel with other processes</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21B200/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>C21B2200/00</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Recycling of non-gaseous waste material</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21B300/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B2300/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Process aspects</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B300/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B2300/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Particular sequence of the process steps</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B300/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21B2300/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modeling of the process, e.g. for control purposes</text></title-part><title-part><text>CII</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21B400/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>C21B2400/00</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Treatment of slags originating from iron or steel processes</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B400/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/02</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Physical or chemical treatment of slags</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/022" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/022</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Methods of cooling or quenching molten slag</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B400/024" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/024</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>with the direct use of steam or liquid coolants, e.g. water</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B400/026" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/026</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>using air, inert gases or removable conductive bodies</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B400/028" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/028</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>with the permanent addition of cooled slag or other solids</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/03</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Removing sulfur</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/032" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/032</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Separating slag from liquid, e.g. from water, after quenching</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/034" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/034</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Stirring or agitating by pressurised fluids or by moving apparatus</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B400/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/04</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Specific shape of slag after cooling</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/042</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Sheets</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/044" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/044</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Briquettes or moulded bodies other than sheets</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21B400/05" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/05</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Apparatus features</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/052" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/052</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>including rotating parts</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B400/056" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/056</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Drums whereby slag is poured on or in between</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B400/058" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/058</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Rotating beds on which slag is cooled</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/06" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/06</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Conveyors on which slag is cooled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/062" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/062</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/064" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/064</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Thermally-conductive removable bodies, e.g. balls</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21B400/066" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/066</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Receptacle features where the slag is treated</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="C21B400/074" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>C21B2400/074</classification-symbol><class-title date-revised="2018-08-01"><title-part><text>Tower structures for cooling, being confined but not sealed</text></title-part></class-title></classification-item>
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