Production method of molten pig iron or intermediate steel product and facility for implementing the production method

摘要

In a method for producing liquid pig iron or liquid steel pre-products from charging substances comprising iron ore, preferably in lumps or pellets, and optionally fluxes. The charging substances are directly reduced to sponge iron in a reduction zone (12) and the sponge iron is melted in a melt-down gasifying zone (8) under the supply of carbon carriers and oxygen-containing gas. CO-and H2-containing gas is introduced into the reduction zone (12) and is reacted there. An export gas is withdrawn and conducted to a consumer (20). The export gas is subjected to CO2 removal or partial combustion and the resulting gas with CO2 is introduced back into the reduction process. This is done to keep down the carbon carriers having high portion of Cfix as well as consumption of O2. A highly CO2-containing gas having a CO2 content far in excess of the CO2 content of the export gas, preferably exceeding 40%, and having a CO content that is far below the CO content of the export gas is introduced into the melt-down gasifying zone (8).