Process for producing molten pig iron with melting cyclone

Details Process for producing molten pig iron with melting cyclone Process for producing molten pig iron with melting cyclone

1996-02-05

1998-09-01

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75500, 75501, 75502, C21B 1314

Patent

active

058005927

ABSTRACT:
A process for producing molten pig iron uses direct reduction of iron ore in a pre-reduction stage followed by a final reduction stage.
In the pre-reduction stage iron ore is pre-reduced in a melting cyclone by means of a reducing process gas originating from the final reduction stage. A post-combustion occurs in the reducing process gas in the melting cyclone so that said iron ore in said melting cyclone is at least partly melted. The partly melted iron ore passes downwardly into a metallurgical vessel situated beneath the cyclone in which the final reduction takes place by supply of coal and oxygen, thereby forming a reducing process gas. A partial post-combustion occurs in the reducing process gas in the metallurgical vessel by means of said oxygen supplied thereto. The post-combustion ratio of the gas on exiting the metallurgical vessel is not more than 0.55. The coal is supplied directly into the slag layer so that said partial post-combustion in said metallurgical vessel is at least partly effected in the slag layer.

REFERENCES:
patent: 4849015 (1989-07-01), Fassbinder et al.
patent: 5228901 (1993-07-01), Taylor et al.
patent: 5567225 (1996-10-01), Bernard et al.
van Langen et al. La Revue de M'etallurgie CIT90 Mar. 1993 No. 3 Paris FR pp. 363-368.
Oeters et al. Stahl und Eisen No. 16 Aug. 14, 1989 Dusseldorf DE.

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