Copper electrowinning and Cr.sup.+6 reduction in spent etchants

Details Copper electrowinning and Cr.sup.+6 reduction in spent etchants Copper electrowinning and Cr.sup.+6 reduction in spent etchants

1979-10-16

1981-03-17

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 52R, 204 97, 204130, C25C 112, C25C 702, C02C 512

Patent

active

042565570

ABSTRACT:
Exhausted Cr.sup.+6 oxidizing solutions containing Cu.sup.+2 values are electrolyzed by placing an exhausted Cr.sup.+6 etching or oxidizing solution containing copper ion and Cr.sup.+3 ions in an electrolytic cell containing at least one pair of carbon particle electrodes, and forcefully flowing the exhausted solution through the electrodes and simultaneously impressing a direct current across the electrodes such that at the cathode divalent copper is reduced to copper metal and Cr.sup.+6 values are reduced to trivalent chromium and at the anode water is oxidized to oxygen.

REFERENCES:
patent: 883170 (1908-03-01), Christy
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patent: 3804733 (1974-04-01), Bennion et al.
patent: 3896013 (1975-07-01), Zievers
patent: 3915822 (1975-10-01), Veltman
patent: 3919062 (1975-11-01), Lundquist, Jr. et al.
patent: 3966571 (1976-06-01), Gagnon et al.

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