Chromium recovery process
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United States of America Patent
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-
Apr 17, 1990
Issued Date -
N/A
app pub date -
Oct 26, 1988
filing date -
Apr 16, 1987
priority date (Note) -
Expired
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Abstract
Waste materials containing chromium, such as the sludge resulting from neutralization of chromic acid bleed streams from metal cleaning and plating operations, are (1) rendered innocuous for land fill purposes by heating to temperatures of at least about 700.degree. C. to stabilize the materials for safe disposal and (2) activated by heating to temperatures of about 400.degree. to 500.degree. and the chromium content in the resulting calcine can be recovered by thermite reduction.
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