Method for precious metal recovery

Details Method for precious metal recovery Method for precious metal recovery

1976-11-26

1978-03-14

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75108, 75118R, 75118P, 75121, C22B 1104, C22B 4300

Patent

active

040789187

ABSTRACT:
A recovery process for reclaiming precious metals from industrial process residues, such as silver chloride resulting from salt analysis of meats in a packing plant, or alternatively, from industrial waste photographic papers or the like. The process comprises pretreating the material with an oxidizing agent capable of substantially completely oxidizing organic contaminants, reacting the material with ammonium hydroxide to form a soluble amine complex, and reacting the amine complex with ascorbic acid or a salt form of ascorbic acid to provide precious metal in elemental form. The preferred process is for reclaiming silver.

REFERENCES:
patent: 3231503 (1966-01-01), Lane
patent: 3458308 (1969-07-01), Muller
patent: 3725047 (1973-04-01), Schneider
patent: 3847598 (1974-11-01), Coulter et al.
patent: 3956088 (1976-05-01), Fassell et al.

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