Chlorination process for recovering gold values from gold alloys

Details Chlorination process for recovering gold values from gold alloys Chlorination process for recovering gold values from gold alloys

1989-02-13

1991-04-02

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75423, C22B 1106

Patent

active

050045008

ABSTRACT:
A process for the recovery of precious metal values as essentially pure gold from gold alloys in the form of thin strips 0.05 to 0.25 inch thick having a gold content of up to 80% gold comprising chlorinating the strips at a temperature of 300 to 700 degrees Centigrade to form a metallic gold/metal chloride mixture and removing the metal chlorides from the gold in the mixture using an aqueous wash. When silver is part of the alloying metal, essentially pure silver is recovered by first washing the metallic gold/metal chloride mixture with hydrochloric acid and then with ammonium hydroxide and recovering the silver from the ammonium hydroxide.

REFERENCES:
patent: 3998926 (1976-12-01), Oliver et al.
patent: 4086084 (1978-04-01), Oliver et al.
patent: 4145187 (1979-03-01), Oliver et al.

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