Composition and method for stripping gold and silver

Details Composition and method for stripping gold and silver Composition and method for stripping gold and silver

1974-09-19

1976-01-27

Drummond, Douglas J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

156 18, 156 19, 252 791, 75107, 75118R, C09K 1300, C23F 304

Patent

active

039350053

ABSTRACT:
A dry powder composition for stripping gold and silver contains 78.0-95.0 percent of a soluble cyanide compound, 0.01-5.0 percent of a soluble lithium compound, 0.01-0.5 percent of a soluble lead or bismuth compound as an auxiliary agent, and 5.0-22.0 percent of a water soluble ring-substituted nitrobenzene acid compound. The nitrobenzene acid compounds are selected from the group consisting of the alkali metal and ammonium salts of methyl-nitrobenzoic acid, chloro-nitrobenzoic acid and amino nitrobenzoic acid and of chloro-nitrobenzenesulfonamides. In using the composition, 7.5-60.0 grams per liter of the dry powder composition is dissolved inwater and the resultant aqueous solution is maintained at a temperature of 18.degree.-55.degree. Centigrade. The solution may be replenished as the stripping rate decreases by addition of further amounts of the dry powder composition.

REFERENCES:
patent: 2100865 (1937-11-01), Mills et al.
patent: 3242090 (1966-03-01), Grunwald
patent: 3649250 (1972-03-01), Dorenfeld et al.
patent: 3816317 (1974-06-01), MacArthur et al.
patent: 3819494 (1974-06-01), Fountain
patent: 3846124 (1974-11-01), Guay
Kirk-Othmer Encyclopedia of Chemical Technology, 2nd Ed., Vol. 6, p. 599, (New York, N.Y.).

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