Patent ID: 6293991
Filing Date: 2001-09-25
Classification: C21B,Y02P,Y10S

Abstract:
Method of producing molten pig iron or molten steel pre-products from charging substances of iron ore comprising:directly reducing the charging substances to sponge iron in a reduction zone;charging the sponge iron into a melt-down gasifying zone;melting the sponge iron in the melt-down gasifying zone under the supply of carbon carriers and an oxygen-containing gas, whereby a CO- and H.sub.2 -containing reducing gas is generated;withdrawing the generated reducing gas from the melt-down gasifying zone;introducing the withdrawn reducing gas into the reduction zone to be reacted with the sponge iron;withdrawing the reacted reducing gas from the reduction zone as a topgas;scrubbing the topgas to separate sludges therefrom;at least partially agglomerating the sludges; andrecirculating the agglomerated sludges into the reduction zone.