Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1987-03-03
1988-05-17
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204228, 204237, 204277, C25C 120
Patent
active
047448741
ABSTRACT:
The invention provides an electrolyte cell which is used for the electrodeposition of silver from a fixer medium (used as the electrolyte) which has previously been used and has to be re-used for developing photographic films, X-ray plates and the like processes wherein silver is extruded by the treatment process. While the silver electrodeposition is taking place, air is bubbled through the electrolyte to prevent copper sulfate and the additives in the electrolyte from settling out and aggregating which shortens the life of the fixer medium. The electric potential which is applied to the electrodes is such as to give a much smaller electrolyzing current i.e. up to 1 amp compared to the more usual electrolyzing currents of 10 amp or more.
REFERENCES:
patent: 1345846 (1920-07-01), Greenawalt
patent: 1954316 (1934-04-01), Hickman et al.
patent: 3003942 (1961-10-01), Cedrone
patent: 4128464 (1978-12-01), Idota
patent: 4139431 (1979-02-01), Scheidegger et al.
patent: 4212722 (1980-07-01), Avedesian et al.
Kaufmann, R., and Mohier, F., "Method for Electrolytically Recovering Metal Dissolved in an Electrolyte," Research Disclosure, Feb. 1981, No. 20212 Havant Hampshire, Great Britain, pp. 88-89.
Andrews R. L.
Fixersave Limited
Goldberg Richard M.
Jackson David A.
Renda Barbara L.
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