Rejuvenation of waste silver-laden solutions

Details Rejuvenation of waste silver-laden solutions Rejuvenation of waste silver-laden solutions

1975-12-24

1977-02-15

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75109, 75121, 96 61R, C22B 1104, C22B 3432

Patent

active

040080773

ABSTRACT:
A method is provided for recovering metallic silver from used silver-laden solutions, such as spent photographic fix, stop baths, stabilizers, electrolytic fix tailings, and waste silver-plating drag out and rinse solutions. The silver-laden solutions are treated with mechanically worked narrow aluminum foil strips, threads or chaff, substantially completely covered with a few microns thick imperfect layer of aluminum oxide. The resulting silver-free solution may then be chelated with a suitable chelating agent to provide a rejuvenated solution, which may be repeatedly used and restored.
The method provides high silver recovery efficiency, and little maintenance, while providing the capability or repetitive use of various solutions employed in photographic development, where silver is obtained.

REFERENCES:
patent: 1624172 (1927-04-01), Levy
patent: 2214765 (1940-09-01), Holzwarth
patent: 2290206 (1942-07-01), Pool
patent: 2507175 (1950-05-01), Pool
patent: 3660079 (1972-05-01), Govani

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