Recovery of precious metals from acid solutions by N-containing

Details Recovery of precious metals from acid solutions by N-containing Recovery of precious metals from acid solutions by N-containing

1993-10-22

1995-05-02

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423DIG14, C22B 324

Patent

active

054115736

ABSTRACT:
The present invention is directed to a process for reducing the oxidation state of a metal by contacting an acidic solution of the metal with an electroactive polymer, and accumulating and recovering the metal. More particularly, the invention is directed to a method for recovering precious metals like gold, platinum, palladium, and gold-platinum alloys from acidic solution by contacting the solution with an electroactive polymer like polyaniline or polypyrrole.

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patent: 4857159 (1989-08-01), Davis
patent: 5131943 (1992-07-01), Allison
E. T. Kang et al., "The Intrinsic Redox States in Polypyrrole . . . ", Surface & Interface Analysis, vol. 19, pp. 33-37 (1992).
Gloria J. McDougall et al., "Activated Carbons and Gold--A Literature Survey", Minerals Sci. Engng, vol. 19, No. 2, pp. 84-99, Apr. 2, 1980.

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