Electrical removal of chromium from chlorate solutions

Details Electrical removal of chromium from chlorate solutions Electrical removal of chromium from chlorate solutions

1988-02-01

1989-05-30

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 95, 204130, C25C 110

Patent

active

048348481

ABSTRACT:
Dichromate values, or other soluble hexavalent chromium values, are removed from cell liquor or other aqueous media containing the same by cathodically reducing the same to trivalent chromium, which deposits on the cathode as chromium hydroxide. The cathode has a high surface area three-dimensional structure which exposes the electrolyte to electrolysis for a relatively long period of time. An electrode potential of about 0 volts vs. SCE is applied to the cathode. Once the electroconductive sites on the cathode become exhausted, the cathode is regenerated chemically or electrochemically for reuse in further dichromate removal.

REFERENCES:
patent: 3679557 (1972-07-01), Gilby et al.
patent: 3909381 (1975-09-01), Ehrsam
patent: 4188272 (1980-02-01), Moring
patent: 4256557 (1981-03-01), Soboroff et al.
patent: 4318789 (1982-03-01), Marcantonio
patent: 4376099 (1983-03-01), Yamamoto et al.
patent: 4699701 (1987-10-01), Lipsztajn

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