Method of producing iron carbide

Details Method of producing iron carbide Method of producing iron carbide

1996-01-18

1997-11-04

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75444, 423439, C22B 514, C01B 3130

Patent

active

056834896

ABSTRACT:
A method for producing iron carbide by bringing iron ore into contact with a reducing gas containing hydrogen and a carbon compound at a specified reaction temperature to reduce and carburize the iron ore with the participation of a sulfur component, the method includes measuring the reaction temperature, partial pressure P(H.sub.2) of the hydrogen and partial pressure P(H.sub.2 S) of hydrogen sulfide contained in the reducing gas, calculating sulfur activity as in the reducing gas from equation (1) shown below, and adjusting the partial pressure P(H.sub.2 S) of the hydrogen sulfide in the reducing gas to obtain as=1.0 to 2.0. at reaction temperatures of 550.degree. C. and above but less than 650.degree. C., as=0.7 to 2.0 at 650.degree. C., and as=0.05 to 1.0 at over 650.degree. C. and up to 950.degree. C.:

REFERENCES:
patent: 5137566 (1992-08-01), Stephens, Jr.
ISIJ International, vol. 32, No. 9, pp. 961-971, Sep. 1992, Shoji Hayashi, et al., "Factors Affecting the Sticking of Fine Iron Ores During Fluidized Bed Reduction".

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