Process for reducing fine-grain iron oxide materials with a gas

Details Process for reducing fine-grain iron oxide materials with a gas Process for reducing fine-grain iron oxide materials with a gas

1993-09-24

1995-01-17

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

266172, C22B 514, C21B 1314

Patent

active

053822773

ABSTRACT:
A process is described in which iron oxide-containing materials are reduced by a treatment with a gas underpressure in series-connected fluidized bed reactors, wherein hydrocarbons are cracked to produce the fresh reducing gas, reducing gas is fed to the first fluidized bed reactor as a fluidizing gas, the gaseous effluent from the first fluidized bed reactor is dedusted and is then fed as a fluidizing gas to at least one further fluidized bed reactor is dedusted and is subsequently treated in a scrubber-cooler to remove substantially all H.sub.2 O and residual dust, purified gas is recycled as recycle gas to the first fluidized bed reactor and the iron oxide-containing materials are preheated and are subsequently fed to the last fluidized bed reactor. The hydrocarbons are cracked by an approximately stoichiometric steam stoichiometric steam reforming. The freshly produced reducing gas is fed to one or more fluidized bed reactors.

REFERENCES:
patent: 5082251 (1992-01-01), Whipp
patent: 5185032 (1993-02-01), Whipp

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