Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1984-11-02
1986-04-22
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C21B 1302
Patent
active
045840164
ABSTRACT:
A method of operating a vertical moving bed reduction reactor for reducing iron ore to sponge iron and having a reduction zone in the upper portion thereof and a cooling zone in the lower portion thereof to obtain a desired degree of metallization of the reduced ore in said reduction zone and a desired degree of carburization in said cooling zone which comprises supplying to said reactor a predetermined flow of reducing gas comprising carbon monoxide and hydrogen and, varying the ratio of reducing gas flow to said reduction zone to the reducing gas flow to said cooling zone to vary at least one of the amount of metallization attained in said reduction zone and the amount of carburization attained in said cooling zone, maintaining the carbon dioxide concentration in said reduction zone at a value which yields the desired degree of metallization therein and maintaining the carbon dioxide concentration in said cooling zone at a value which yields the desired degree of carburization in said cooling zone.
REFERENCES:
patent: 3853538 (1974-12-01), Nemeth
patent: 4179281 (1979-12-01), Ono et al.
patent: 4224057 (1980-09-01), Martinez-Vera et al.
patent: 4336063 (1982-06-01), Guzman-Bofill et al.
Becerra-Novoa Jorge O.
Cantu-Hernandez Francisco
Martinez-Vera Enrique R.
Andrews Melvyn J.
Hylsa, S.A.
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