Verfahren zur Herstellung von flüssigem Roheisen oder flüssigen Stahlvorprodukten und heiss brikettiertem Eisen

摘要

A process for producing molten pig iron from feed materials formed from iron ores and fluxes and at least partially containing a fines fraction, in which the feed materials are directly reduced in at least one reduction zone (18) to sponge iron, the sponge iron is smelted in a fusion gasification zone (I to IV) with addition of carbon carriers and oxygen-containing gas, and a reduction gas is generated which is introduced into the reduction zone (18), converted therein and taken off as export gas, is to be improved in such a way that the use of fine ore is possible in an economical manner. This is achieved when - predominantly haematitic and/or magnetitic fine ores and/or ore dusts are subjected in a preheating zone (2) to preheating in a fluidised-bed process, - the feed materials thus preheated are largely fully reduced in at least one downstream reduction zone by a fluidised-bed process, - whereupon the feed materials are charged by means of forced conveying into the fluid bed (II, III) of the fusion gasification zone (I to IV) and smelted therein (Figure 1).