Method for producing molten pig iron or semi-finished steel material and sponge iron and apparatus for implementing the method

摘要

PCT No. PCT/AT95/00198 Sec. 371 Date Jul. 22, 1997 Sec. 102(e) Date Jul. 22, 1997 PCT Filed Oct. 12, 1995 PCT Pub. No. WO96/12044 PCT Pub. Date Apr. 25, 1996In a process for the production of molten pig iron or molten steel pre-products and sponge iron from charging materials consisting of iron ore and, if desired, fluxes, direct reduction of the charging materials to sponge iron is carried out in a fixed-bed reduction zone, the sponge iron is melted in a meltdown gasifying zone under supply of carbon carriers as well as an oxygen-containing gas and a CO- and H2-containing reducing gas is produced which is fed to the reduction zone, is reacted there and is drawn off as an export gas, and the drawn-off export gas is subjected to CO2 elimination and for the production of sponge iron is along with part of the reducing gas formed in the meltdown gasifying zone as an at least largely CO2 free reducing gas conveyed to a further reduction zone for the direct reduction of iron ore. In order to save investment costs incurred for the plant and to increase productivity, part of the reducing gas produced in the meltdown gasifying zone is branched off and fed to the further reduction zone while avoiding CO2 elimination.