Electrochemical restoration of cyanide solutions

Details Electrochemical restoration of cyanide solutions Electrochemical restoration of cyanide solutions

1985-12-19

1987-03-24

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204106, 204112, 204114, 204120, 204130, 252 794, C25C 100, C25C 112

Patent

active

046523510

ABSTRACT:
Metal stripping solutions of alkaline cyanide and organic acid stripping agents used to strip metal coatings from steel or other substrates are restored for reuse. The process is a membrane electrochemical process wherein an electric current is passed through an electrochemical cell having a membrane separating the metal strip solution from oxygen formed at the cell anode while the strip solution is restored by removal of stripped metals on the cell cathode as electroplatings. The process restores spent strip solution without producing a toxic waste and reduces potential hazards of handling and shipping. The stripped metals are recovered as metals for use in electroplating and other processes.

REFERENCES:
patent: 1954664 (1934-04-01), Cain
patent: 3463710 (1969-08-01), Lower
patent: 4051001 (1977-09-01), Inoue et al.
patent: 4378270 (1983-03-01), Brasch
patent: 4468305 (1984-08-01), Hillis
patent: 4490224 (1984-12-01), Warheit
patent: 4545877 (1985-10-01), Hillis
Girish D. Parikh et al., Western Electric Eng., vol. 16, No. 2, pp. 3-8, Apr. 1972.

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