Methods of treatment of chromite ore processing residue
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United States of America Patent
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Jun 5, 2012
Grant Date -
Apr 8, 2010
app pub date -
Dec 10, 2009
filing date -
Oct 16, 2006
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Abstract
Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite processing wastes with sulfide ion; and, contacting the chromite processing wastes with ferrous sulfide.
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