Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1976-11-01
1978-09-05
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 38, 75 40, 75 48, 75 60, C21C 552
Patent
active
041116879
ABSTRACT:
A process and apparatus for the production of intermediate hot metal suitable for further refining into steel is disclosed.
The basic process includes the steps of heating a charge of ore in a reducing furnace having a reducing atmosphere therein comprising a mixture of reconditioned and recycled top gas from the reducing furnace and off-gas rich in hydrogen and carbon monoxide produced by a cupola melting unit to reduce the ore to iron, partially carburizing the reduced iron in the reducing furnace with carbon-containing off-gas produced by the cupola melting unit, and melting the reduced and carburized iron together with scrap, slag forming additives and fluxes in a cupola melting unit having a reducing atmosphere therein produced by the combustion of a rich fuel/oxidant mixture to form a molten slag and molten iron suitable for the further refining to produce steel. The process contemplates the further refining of the molten iron from the cupola in an electric steelmaking furnace or an oxygen steelmaking converter. In an alternative form of the process, the reduced and carburized iron is cooled within or outside the reducing furnace to form prereduced metal pellets suitable for use as a part of the burden in a melting unit.
The apparatus comprises a refractory lined cupola melting unit portion equipped with burners capable of burning a rich fuel/oxidant mixture to produce a reducing atmosphere within the melting unit and off-gas rich in gaseuos reductants, a direct reducing unit portion communicating with the upper end of the melting unit to receive the melting unit off-gas recirculating and conditioning means to recycle at least a portion of the top gas from the upper region of the reducing unit portion to the lower region of the reducing unit portion, means for introducing ore into the direct reduction unit portion of the apparatus, and means for introducing additives and fluxes into the melting unit portion of the apparatus.
REFERENCES:
patent: 2182009 (1939-12-01), Wiberg
patent: 3301661 (1967-01-01), McGlynn et al.
patent: 3356488 (1967-12-01), Walsh
patent: 3936296 (1976-02-01), Campbell
Andrews M. J.
Consolidated Natural Gas Service Company, Inc.
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