Electrolytic recovery of silver from photographic bleach-fix bat

Details Electrolytic recovery of silver from photographic bleach-fix bat Electrolytic recovery of silver from photographic bleach-fix bat

1979-04-23

1980-07-08

Williams, Howard S.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 204109, 137 93, 430400, 430460, C25C 706, C25C 120, G05D 1108, G03C 538

Patent

active

042116309

ABSTRACT:
This invention relates to the recovering of metallic silver from photographical bleach-fix baths. An electric current is passed through a bleach-fix solution containing silver ions and ferric ions, which solution has been brought to a predetermined redox potential by the addition of a reducing agent. The cathode is of the type wherein reduced silver ions can deposit thereon as metallic silver. The redox potential of the electrolyte solution is continuously monitored and a reducing agent is added automatically when the redox potential rises above a predetermined level. When the redox potential drops below a predetermined level the addition of the reducing agent is automatically stopped.

REFERENCES:
patent: 3431187 (1969-03-01), Lancy
patent: 3879203 (1975-04-01), Schranz et al.
patent: 4036715 (1977-07-01), Baden et al.
patent: 4139431 (1979-02-01), Scheidegger et al.

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