Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1978-08-17
1980-01-29
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204195R, 204195F, C25C 120, C25C 700, C25C 702
Patent
active
041860675
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: 3051631 (1962-08-01), Harbin, Jr. et al.
patent: 3179581 (1965-04-01), Lewin et al.
patent: 3649509 (1972-03-01), Morawetz et al.
patent: 4036715 (1977-07-01), Baden et al.
Blake Colin C.
Payne Ivan C.
Andrews R. L.
Ciba-Geigy Aktiengesellschaft
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