Patent ID: 8016910

Claim:
A method for producing liquid pig iron or liquid steel intermediate products from fine-particled material containing iron oxide, the method comprising: prereducing the fine-particled material containing iron oxide in at least one prereduction stage with the aid of a reduction gas, subsequently reducing the fine-particled material containing iron oxide to sponge iron in a final reduction stage; melting the sponge iron in a melt-down gasification zone, along with supplying carbon carriers and oxygen-containing gas, such that a CO- and H 2 -containing reduction gas is generated, introducing the reduction gas into the final reduction stage, converting the gas there, drawing off the gas and subsequently introducing the drawn off gas into at least one prereduction stage, converting the gas there and drawing off the gas; introducing a quantity fraction of the fine-particled material containing iron oxide into a melt-down gasification zone via the at least one prereduction stage, and one final reduction stage, and introducing a further quantity fraction of the fine-particled material containing iron oxide into the melt-down gasification zone directly or together with the carbon carriers and the oxygen-containing gas; subjecting the reduction gas emerging from the melt-down gasification zone to a hot dedusting to yield a processed reduction gas and subsequently supplying the processed reduction gas to the final reduction stage and to all the prereduction stages with an increased specific reduction gas quantity; and after the hot dedusting, setting the processed reduction gas at a higher temperature than is necessary for the finish reduction of the fine-particled material containing iron oxide in the final reduction stage, wherein the setting of the reduction gas temperature for the final reduction stage is by a metered addition of processed blast furnace gas drawn off from the at least one prereduction stage.