Life silver recovery system

Details Life silver recovery system Life silver recovery system

1988-02-01

1989-11-21

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75108, 75109, 210719, 210723, C22B 1104

Patent

active

048819735

ABSTRACT:
A process is described which improves the life of a silver recovery unit which employs finely divided iron and a minor amounts of a copper or cadmium salt therein by raising the pH of waste acidic photographic processing stream containing silver to be recovered. This pH increase may be accomplished using waste developer stream. An additional use of a chelating agent has been found to be beneficial.

REFERENCES:
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patent: 3792845 (1974-02-01), Larson et al.
patent: 4035181 (1977-07-01), Fisch
patent: 4110109 (1978-08-01), Golben
patent: 4213600 (1980-07-01), Thompson, Jr.
patent: 4303441 (1981-12-01), Lamisse
patent: 4441697 (1984-04-01), Peterson et al.
patent: 4740244 (1988-04-01), Williams

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