Chromate recovery process

Details Chromate recovery process Chromate recovery process

1979-12-12

1982-03-09

Metz, Andrew

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423 53, 423 61, 423596, C02F 146, C01G 3702

Patent

active

043187889

ABSTRACT:
A process for recovering and recycling chromium from chromium-iron hydroxide sludge for use in cooling tower make up water and plating solution is disclosed. The process comprises separating chromium from the sludge by selectively oxidizing the trivalent chromium precipitate to soluble hexavalent chromium with a strong oxidizing agent such as chlorine gas, in alkaline medium. The hexavalent chromium ions then enter solution and are thereafter separated from the iron hydroxide precipitate as the sludge is dewatered.

REFERENCES:
patent: 802205 (1905-10-01), Gibbs
patent: 3926754 (1975-12-01), Lee
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patent: 4014766 (1977-03-01), Watanabe et al.
patent: 4036726 (1977-07-01), Gale et al.
patent: 4123339 (1978-10-01), Gale et al.
patent: 4171248 (1979-10-01), Carlin
patent: 4188272 (1980-02-01), Moring
"Inorganic Chemistry", Ephraim, 4th ed., rev. 1943, p. 473.

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