C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
C21B 13/14 (2006.01) C21B 13/00 (2006.01)
Patent
CA 2116749
-26- In a. first fluidized bed vessel containing an expanded fluidized beck iron oxide-containing materials are reduced under weakly reducing conditions with solid carbonaceous reducing agents to or to less than the feO state. In a second fluidized bed vessel containing an expanding fluidized bed the gas-solids suspension discharged from the first fluidized bed vessel is treated with a highly reducing fluidizing gas whereby the material is reduced in part to iron metal. From the gas-solids/suspension discharged from the second fluidized bed vessel the carbonized carbonaceous material is separated and is recycled to the first fluidized bed vessel. The exhaust gas from which the carbonized carbonaceous material has been removed is purified and CO2 is removed therefrom and the exhaust gas is subsequently fed as a fluidizing gas to the second fluidized bed vessel. A reduced material which has a degree of metallization from 50 to 80 % and the remainder of the carbonized carbonaceous material are discharged from the second fluidized bed vessel and in a melting reactor are completely reduced and melted. The has evolved from the molten material is afterburnt directly above the molten material by a blowing of oxygen-containing gases onto the surface of -27- the molten material and the heat which is thus generated is substantially transferred to the molten material. A succeeding second of afterburning results in a complete afterburning of the gas. The material discharged from the lower portion of the second fluidized bed vessel may be reduced further in a third fluidized bed vessel up to a degree of metal- lization of 95%.
Bresser Wolfgang
Hirsch Martin
Kosters Bernd
Rose Fritz
Metallgesellschaft Aktiengesellschaft
Robic
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