Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1977-08-29
1980-05-27
Wyse, Thomas G.
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
210DIG30, C02C 502
Patent
active
042049733
ABSTRACT:
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 exceeding 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 reuse after passing through a filter to remove the barium sulfate.
REFERENCES:
patent: 3371034 (1968-02-01), Richards
patent: 3575853 (1971-04-01), Gaughan et al.
patent: 3728273 (1973-04-01), Bruen et al.
patent: 3869386 (1975-03-01), Izdebski
patent: 3969246 (1976-07-01), Feltz et al.
Cunningham Ross
Feltz Edward J.
Cunningham John
Wyse Thomas G.
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