Process for reduction of hexavalent chromium

Details Process for reduction of hexavalent chromium Process for reduction of hexavalent chromium

1991-09-19

1994-05-31

Cintins, Ivars

Liquid purification or separation

Processes

Chemical treatment

210904, 210913, C02F 170, C02F 900

Patent

active

053166841

ABSTRACT:
Hexavalent chromium is reduced to trivalent chromium by reacting the hexavalent chromium with peroxide in acidic solution. In another aspect of the invention, the hexavalent chromium reduction with peroxide step may take place after the step of the destruction with aldehyde of any cyanide or cyanide compounds present, so that the peroxide may destroy any excess aldehyde remaining after the first step. No materials are added which have to be removed later in the process. In either case, the waste solution may then be treated with sodium hydroxide, or other conventional materials, to precipitate chromium hydroxide and effect removal of the hazardous chromium from the waste stream.

REFERENCES:
patent: 3505217 (1970-04-01), Morico
patent: 3896209 (1975-07-01), Fournier et al.
patent: 4104162 (1978-08-01), Junkermann et al

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