Method for producing iron carbide

Details Method for producing iron carbide Method for producing iron carbide

1997-06-16

1999-12-21

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

423439, 75444, C22B 514, C01B 3130

Patent

active

060043733

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 high reaction temperature and at a reaction pressure of the atmospheric pressure or more 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 a.sub.s 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 a.sub.s =1.0 to 2.0 at reaction temperatures of 550.degree. C. and above but less than 650.degree. C., a.sub.s =0.7 to 2.0 at 650.degree. C., and a.sub.s =0.05 to 1.0 at over 650.degree. C. and up to 950.degree. C.: (1) a.sub.s =(P(H.sub.2 S)/P(H.sub.2))/(P(H.sub.2 S)/P(H.sub.2)).sub.E where (P(H.sub.2 S)/P(H.sub.2)) represents the ratio between the partial pressures of H.sub.2 S and H.sub.2 in the reducing gas and (P(H.sub.2 S)/P(H.sub.2)).sub.E is the ratio between the partial pressures of H.sub.2 S and H.sub.2 in a condition where the reaction of Equation (2) below is in equilibrium: (2) FeS(s)+H.sub.2 (g)=Fe(s)+H.sub.2 S(g) where (s) and (g) represent solid and gaseous phases, respectively. The method includes controlling the reaction pressure to the atmospheric pressure or more in accordance with the oxidizing gas contained in a reducing gas at a reaction temperature of 650.degree. C. or more.

REFERENCES:
patent: 5137566 (1992-08-01), Stephens, Jr. et al.
patent: 5683489 (1997-11-01), Hayashi et al.
Shoji Hayashi, et al., ISIJ International, vol. 32, 1992, No. 9, pp. 962-971, "Factors Affecting the Sticking of Fine Iron Ores During Fluidized Bed Reduction" Jun.

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