Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Timothy Clark Heffernan0
Gary Joel Meyer0
Steven A. Chisick0
Thomas P. McCullough0
Date of Patent
March 2, 2010
0Patent Application Number
115786210
Date Filed
September 7, 2005
0Patent Primary Examiner
Patent 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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