Process for producing iron from fine-grained iron ores

Details Process for producing iron from fine-grained iron ores Process for producing iron from fine-grained iron ores

1987-08-26

1989-07-25

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 38, 75 40, 266160, C22B 514

Patent

active

048510408

ABSTRACT:
A process of producing iron from fine-grained iron ore by direct reduction, which includes adding oxygen, sponge iron and at least one of coal fines and low-temperature carbonized coal to an iron bath in a melt gasifier to produce a reducing gas, regulating the temperature of the reducing gas by blowing coal fines into it to produce a cooled reducing gas and a low-temperature carbonized coal, separating the low-temperature carbonized coal from the cooled reducing gas in order to use the separated low-temperature carbonized coal in the melt gasifier, preheating a fine-grained iron ore with a used reducing gas containing carbon monoxide to a temperature from 450.degree. to 700.degree. C., and reducing the preheated fine-grained iron ore with the cooled reducing gas at a temperature from 700.degree. to 1100.degree. C. in at least one fluidized bed to produce sponge iron and used reducing gas containing carbon monoxide, wherein the step of preheating the fine-grained iron ore results in decomposition of at least part of the carbon monoxide contained in the used reducing gas, producing a carbon layer on the preheated fine-grained iron ore, and also producing an exhaust gas and additional heat.

REFERENCES:
patent: 3936296 (1976-02-01), Campbell
patent: 4007034 (1977-02-01), Hartwig et al.
patent: 4045214 (1977-08-01), Wetzel et al.
patent: 4215101 (1980-07-01), Kriegel et al.
Wicke, Hedden and Luth, "Reduktion von Feinerzen in zwei Stufen . . . ", Stahl und Eisen, 2/5/1959, pp. 129-134.

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