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    Final Report: Processes for Recovery and Recycling of Chromium From Spent Chromium Oxide Fluorination Catalysts

    Type of evidence: 

    Author names: 

    Darrell Coons


    US EPA



    The purpose of this Phase I project was to develop a process for recovery of chromium from spent chromium(III) oxide fluorination catalysts and similar waste or byproduct streams. The spent catalysts contain 40-64% chromium, primarily in the forms of chromium(III) oxide, Cr2O3, and chromium(III) fluoride, CrF3. They are hazardous solid wastes, for which no known processes for chromium recovery had previously existed. Little has been reported on the chemistry of chromium(III) fluoride. Work in our laboratories has shown that the spent catalysts are extremely inert to chemical attack by...