Silver reclamation apparatus

Details Silver reclamation apparatus Silver reclamation apparatus

1978-08-07

1980-07-22

Castel, Benoit

Metallurgical apparatus

Means for treating ores or for extracting metals

By means precipitating metal from solution

210266, 210283, 75118P, C22B 1112

Patent

active

042136008

ABSTRACT:
Apparatus for recovering silver from spent photographic processing solutions is disclosed. The silver recovery apparatus includes a cylindrical container in which a plurality of fluid permeable layers of a chemical reduction agent are disposed in interleaved relation with a plurality of fluid permeable layers of a non-reactive filter material. The interleaved combination of the layers defines a fluid permeable flow path through the container. The chemical reduction agent in each reduction layer comprises a metal which is electropositive with respect to silver. In a preferred embodiment, the chemical reduction agent disposed in an adjacent pair of reduction layers comprises first and second metals occupying relatively different positions in the electromotive series, respectively, thereby producing a galvanic effect which enhances the precipitation of silver.

REFERENCES:
patent: 3630505 (1971-12-01), Mackay
patent: 3655175 (1972-04-01), Zeleny et al.
patent: 3660079 (1972-05-01), Govani
patent: 3792845 (1974-02-01), Larson et al.
patent: 3840217 (1974-10-01), Mackay
patent: 4096064 (1978-06-01), du Fresne

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