Silver removal

Details Silver removal Silver removal

1995-04-27

1996-07-16

Phasge, Arun S.

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Preparing inorganic compound

205747, 205750, 205751, 205770, 204264, C02F 1463

Patent

active

055363873

ABSTRACT:
Effluent streams from photographic processes contain both silver and thiosulphate ions, and because of the formation of complex anions it is difficult to remove the silver. The silver may be removed using a cell (12) with a cathode (24) exposed to the effluent liquid, and an anode (25) separated from the liquid by a barrier (22) permeable at least to anions. Some silver sulphide is formed electrochemically at the cathode (24); at the anode (25) water is electrolysed and becomes acidic, so the complex anions migrating through the barrier (22) generate silver sulphide chemically. The resulting silver sulphide precipitate is separated from the liquid by a filter (14).

REFERENCES:
patent: 3925175 (1975-12-01), Fisch et al.
patent: 4036715 (1977-07-01), Baden et al.
patent: 4089760 (1978-05-01), Ono

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