Silver recovery device

Details Silver recovery device Silver recovery device

1990-11-14

1992-07-28

Valentine, Donald R.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204234, 204237, 204236, 210143, 2101951, 210269, 210284, 210287, C25D 2112, C25D 2118, B01D 2130, C02F 900

Patent

active

051338467

ABSTRACT:
Silver is recovered from the rinse water from a photographic film processing unit by means of a silver recovery device in which the rinse water is passed through at least one bed of ion exchange resin particles maintained in fluidized condition by the water flow. A plurality of such beds are preferably connected in series with rinse water being recirculated until fresh rinse water causes overflow to the next bed and finally to a collection vessel. Fluidization is interrupted periodically to create quiescent periods which aid in removal from the resin particles of accumulated gelatin from the processed film.

REFERENCES:
patent: 3761381 (1973-09-01), Yagishita
patent: 4612115 (1986-09-01), Titoff
patent: 4800005 (1989-01-01), Rosenfield et al.
patent: 4855046 (1989-08-01), Meehan

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