Process for chromium removal using an inorganic sulfur compound

Details Process for chromium removal using an inorganic sulfur compound Process for chromium removal using an inorganic sulfur compound

C - Chemistry, Metallurgy

02

F

C02F 1/62 (2006.01) C01B 11/14 (2006.01) C01G 37/02 (2006.01) C25B 1/26 (2006.01)

Patent

CA 2100948

A method has been devised for removing chromium ions from a chromium ion containing liquid and recovering chromium oxide in an usable form by (a) adjusting the temperature of the liquid to an optimal temperature to maximize reduction and simultaneous precipitation of the chromium oxide; (b) adding a reducing agent to the liquid to form a mixture, where the reducing agent is at least one inorganic sulfur compound selected from the group of sulfur compounds where sulfur is in the 4+ oxidation state; (c) adjusting the pH of the mixture to a pH between 5 and 7; (d) optionally further adjusting the pH of the mixture to a pH between above 7 to 12; and (e) separating the chromium from the mixture.

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