C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
134/35
C02F 1/00 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C02F 9/00 (2006.01)
Patent
CA 1072412
Abstract of the Disclosure The present invention is directed to a process for removing and optionally recovering hexavalent chromium from chromium waste water. The invention involves the use of a treatment mixture comprising the combination of barium carbonate and/or barium hydrate, plus one or more certain specified acetates. The process involves contacting the chrome waste water to be treated with the treatment mixture at an acetic pH not e .g 6.0, and usually from 4.0 to 6.0, followed by filtration through an acid-resistant filter. The chromium removed by this filter in the form of barium chromate can be regenerated into chromic acid by backwashing the filter into an agitated tank and treating to produce chromic acid and barium sulfate. The thus-generated chromic acid can then be returned to the chrome plating tank for re- use after passing through a filter to remove the barium sulfate. -1-
255874
Cunningham Ross
Feltz Edward J.
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