Method of reducing iron ore

Details Method of reducing iron ore Method of reducing iron ore

1985-07-08

1987-05-26

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C21B 1302

Patent

active

046682848

ABSTRACT:
A process for the gaseous reduction of iron ore to sponge iron in a vertical shaft, moving bed reactor wherein a hot gaseous mixture of hydrogen and a carbon monoxide is used to reduce the ore. It has been found unnecessary to use the external catalytic reformer of prior art processes to reform the methane and other hydrocarbon constituents of the natural gas commonly used as a source of gaseous reductants. By establishing a reducing gas recycle loop to which make-up natural gas and steam are fed in the proper proportions, the product sponge iron in the reactor can be used to catalyze hydrocarbon reformation, provided that the carbon content of the recycled gas is maintained low by removing carbon dioxide therefrom. Where pure methane is employed, steam/methane molar ratios within the preferred range of 1.4:1 to 2.2:1 are used.

REFERENCES:
patent: 4528030 (1985-07-01), Martinez-Vera et al.

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