Patent ID: 6171365
Filing Date: 2001-01-09
Classification: C21B,Y02P,Y10S

Abstract:
Method for producing liquid pig iron (16) or liquid steel pre-products and sponge metal from charging substances comprising iron ore (4) and optionally fluxes (5), comprising directly reducing the charging substances to sponge iron in at least one first reduction zone (2), melting the sponge iron in a melt-down gasifying zone (15) under the supply of carbon carriers (10) and oxygen-containing gas, thereby producing a CO-- and H.sub.2 -containing reducing gas, feeding said reducing gas to the first reduction zone (2) reacting it and withdrawing it as a top gas, subjecting the withdrawn top gas to a scrubbing operation in a first scrubber (8) to remove water containing sludges, further subjecting the top gas to CO.sub.2 elimination and optionally to heating and supplying it to at least one further reduction zone (27) for the direct reduction of metal ore (26), as a reducing gas that is at least largely free from CO.sub.2 and after reaction with the metal ore (26) withdrawing it as an export gas and purifying it in a second scrubber (31) to further remove water containing sludges, the sludges obtained in scrubbing the top gas from the first reduction zone (2) being dewatered and charged into the melter gasifier (15), and the sludges obtained in the scrubbing of the export gas of the further reduction zone (27) being dewatered and fed into the first direct reduction zone (2).