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| SECTION C– CHEMISTRY; METALLURGY |
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| C 21 | METALLURGY OF IRON |
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| C 21 B | MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C 22 B 1/00; electric heating H 05 B) |
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| Notes |
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| (1) | This subclass covers: |
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| – | the production of iron or steel from source materials, e.g. the production of pig-iron; |
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| – | apparatus specially adapted therefor, e.g. blast furnaces, air heaters (furnaces in general F 27). |
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| (2) | Processes using enzymes or micro-organisms in order to: |
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| (i) | liberate, separate or purify a pre-existing compound or composition, or to |
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| (ii) | treat textiles or clean solid surfaces of materials |
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| are further classified in subclass C 12 S. [5] |
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3/ | 00 | General features in the manufacture of pig-iron (mixers for pig-iron C 21 C 1/06) |
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3/ | 02 | . | by applying additives, e.g. fluxing agents |
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3/ | 04 | . | Recovery of by-products, e.g. slag |
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3/ | 06 | . | . | Treatment of liquid slag (slag wool C 03 B; slag stones C 04 B) |
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3/ | 08 | . | . | . | Cooling slag |
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3/ | 10 | . | . | . | Slag pots; Slag cars |
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5/ | 00 | Making pig-iron in the blast furnace |
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5/ | 02 | . | Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals |
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5/ | 04 | . | Making slag of special composition |
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5/ | 06 | . | using top gas in the blast furnace process (in coke ovens C 10 B) |
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7/ | 00 | Blast furnaces (lifts associated with blast furnaces B 66 B 9/06) |
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7/ | 02 | . | Internal forms |
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7/ | 04 | . | with special refractories (refractory materials C 04 B) |
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7/ | 06 | . | . | Linings for furnaces |
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7/ | 08 | . | Top armourings |
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7/ | 10 | . | Cooling; Devices therefor |
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7/ | 12 | . | Opening or sealing the tap holes |
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7/ | 14 | . | Discharging devices, e.g. for slag |
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7/ | 16 | . | Tuyères |
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7/ | 18 | . | Bell-and-hopper arrangements |
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7/ | 20 | . | . | with appliances for distributing the burden |
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7/ | 22 | . | Dust arresters |
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7/ | 24 | . | Test rods or other checking devices |
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9/ | 00 | Stoves for heating the blast in blast furnaces |
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9/ | 02 | . | Brick hot-blast stoves |
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9/ | 04 | . | . | with combustion shaft |
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9/ | 06 | . | . | Linings |
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9/ | 08 | . | Iron hot-blast stoves |
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9/ | 10 | . | Other details, e.g. blast mains |
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9/ | 12 | . | . | Hot-blast valves or slides for blast furnaces (valves in general F 16 K) |
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9/ | 14 | . | Preheating the combustion air |
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9/ | 16 | . | Cooling or drying the hot-blast |
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11/ | 00 | Making pig-iron other than in blast furnaces |
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11/ | 02 | . | in low shaft furnaces |
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11/ | 06 | . | in rotary kilns |
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11/ | 08 | . | in hearth-type furnaces |
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11/ | 10 | . | in electric furnaces |
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13/ | 00 | Making spongy iron or liquid steel, by direct processes |
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13/ | 02 | . | in shaft furnaces |
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13/ | 04 | . | in retorts |
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13/ | 06 | . | in multi-storied furnaces |
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13/ | 08 | . | in rotary furnaces |
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13/ | 10 | . | in hearth-type furnaces |
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13/ | 12 | . | in electric furnaces |
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13/ | 14 | . | Multi-stage processes |
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15/ | 00 | Other processes for the manufacture of iron from iron compounds (general methods of reducing to metal C 22 B 5/00; by electrolysis C 25 C 1/06) |
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15/ | 02 | . | Metallothermic processes, e.g. thermit reduction |
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15/ | 04 | . | from iron carbonyl |
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