Process and apparatus for producing metallized pellets and scrubbing spent reducing gas
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United States of America Patent
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Feb 13, 1990
Issued Date -
N/A
app pub date -
Mar 1, 1988
filing date -
Apr 17, 1986
priority date (Note) -
Expired
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Abstract
An improved method and apparatus for producing metallized iron or other metal by direct reduction of particulate metal oxide is disclosed. Spent reducing gas is recycled from a reduction furnace through a cooler-scrubber and a catalyst-containing stoichiometric gas reformer. In the cooler-scrubber, the spent reducing gas interacts with scrub water. Dust having an affinity for sulfur is recovered from the process and added to the scrub water causing sulfur in the spent reducing gas to form solids which precipitate and are removed as solid waste. Lowering the sulfur content of the spent reducing gas reduces the sulfur contamination of the catalyst and improves the efficiency of the process.
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