Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1988-06-27
1989-11-14
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
266 80, 266155, C21B 1302
Patent
active
048804592
ABSTRACT:
This invention relates to a method and apparatus for reducing iron oxide to metallic iron, utilizing a continuous process employing a reducing gas with high hydrogen and carbon monoxide content made by a catalytically reforming mixture of hydrocarbons, reacted off-gases from the reduction process and steam generated from waste heat from the process and or flue gases. Carbon dioxide and water vapor present in the reacted off-gas is utilized as a hydrocarbon reforming oxidant. Steam generated from waste heat from process and/or waste flue gas is also used as a hydrocarbon reforming oxidant. The steam injected into the process gas stream is also used to control the hydrogen-carbon monoxide ratio required for efficient reduction of iron oxide to metallic iron. After catalytic reforming, the hydrogen to carbon monoxide ratio of the reformed reducing gas is monitored, and a signal is generated by the monitoring means, which controls the addition of steam to the heated reducing gas prior to its entering the reformer.
REFERENCES:
patent: 3189438 (1965-06-01), von Bogdandy
patent: 4019724 (1977-04-01), Cruse, Jr.
patent: 4370162 (1983-01-01), Dominguez-Ahedo et al.
Andrews Melvyn J.
T.C., Inc.
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