Patent Number: 6,251,162

Title: Process for the production of liquid pig iron or liquid intermediate products of steel

Abstract: 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 H.sub.2 -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 An export gas is withdrawn and conducted to a consumer (20).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 CO.sub.2 removal or partial combustion and the resulting gas with CO.sub.2 is introduced back into the reduction process. This is done to keep down the carbon carriers having high portion of C.sub.fix as well as consumption of O.sub.2. A highly CO.sub.2 -containing gas having a CO.sub.2 content far in excess of the CO.sub.2 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).

Inventors: Eichberger; Ernst (Pichl/Wels, AT), Schrey; Gunter (Linz, AT), Reufer; Franz (Dusseldorf, DE), Diehl; Jorg (Linz, AT), Rosenfellner; Gerald (St.Peter/Au, AT)

Assignee: Deutsche Voest-Alpine Industrieanlagenbau GmbH

International Classification: C21B 13/14 (20060101); C21B 011/00 ()

Expiration Date: 06/26/2018