Method of and apparatus for reducing iron oxide to metallic iron
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Jun 27, 1988
filing date -
Jun 27, 1988
priority date (Note) -
Expired
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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.
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