Method for recovering silver from waste solutions containing thi

Details Method for recovering silver from waste solutions containing thi Method for recovering silver from waste solutions containing thi

1986-09-24

1988-07-05

Shah, Mukund J.

Radiation imagery chemistry: process, composition, or product th

Regenerating image processing composition

75118P, 210721, 210737, 210749, 210766, 210912, 423 23, 430399, 430400, C22B 1100, G03C 524

Patent

active

047554533

ABSTRACT:
In a process for recovering silver from spent photographic treatment solution comprises mixing nitric acid with a quantity of the treatment solution to precipitate from the solution silver sulfide. The silver sulfide may be then converted to pure silver. The improvement comprises mixing less than two parts of concentrated nitric acid solution with more than ten parts of the treatment solution to precipitate out of solution silver sulfide. The solution is filtered to remove the silver sulfide precipitate from the solution to yield a solid residue which includes silver sulfide.

REFERENCES:
patent: 2060539 (1928-04-01), Spies
patent: 3537986 (1970-11-01), Watanabe et al.
patent: 3982932 (1976-09-01), Korosi
patent: 4437889 (1984-03-01), Palacios-Mendoza
patent: 4585561 (1986-04-01), Zlokarnik et al.

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