Apparatus for recovery of silver from spent, waste, acidic proce

Details Apparatus for recovery of silver from spent, waste, acidic proce Apparatus for recovery of silver from spent, waste, acidic proce

1987-12-01

1989-08-08

Fisher, Richard V.

Metallurgical apparatus

Means for treating ores or for extracting metals

By means precipitating metal from solution

75118R, 2101981, C22B 1303, C22B 1512

Patent

active

048545520

ABSTRACT:
Apparatus for recovery of silver from spent, waste acidic silver halide photographic processing fluid, e.g., fixer solution, comprising passing the fluid through finely divided iron e.g., steel wool, contained in a vessel in the presence of a metal salt of copper or cadmium, e.g., copper(II)sulfate, copper chloride dihydrate, cadmium sulfate, etc. The ratio of iron to metal salt is 25 to 1 to 4 to 1.

REFERENCES:
patent: 2214765 (1940-09-01), Holzwarth
patent: 3043432 (1962-07-01), Megesi
patent: 3369801 (1968-02-01), Hartman
patent: 3705716 (1972-12-01), Hendrickson
patent: 3792845 (1974-02-01), Larson et al.
patent: 4213600 (1980-07-01), Thompson, Jr.
patent: 4303441 (1981-12-01), Lamisse
patent: 4441697 (1984-04-01), Peterson et al.

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