Process for the recovery of gold from a precious metal bearing s

Details Process for the recovery of gold from a precious metal bearing s Process for the recovery of gold from a precious metal bearing s

1986-05-07

1987-06-02

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75101R, 75108, 75114, 75115, 75121, 423 22, 423 27, 423 36, 423 38, 423 41, 423 42, 423 45, 423 46, C22B 1104

Patent

active

046700528

ABSTRACT:
A process for the recovery of gold from a precious metal bearing sludge concentrate is disclosed. The process comprises the steps of leaching the sludge with hydrochloric acid and hydrogen peroxide to solubilize at least gold, palladium and platinum, removing silver from the leach slurry as insoluble silver chloride and selectively precipitating gold from the leach solution remaining after removal of silver by reduction with SO.sub.2 in the presence of sodium ions.

REFERENCES:
patent: 3658510 (1972-04-01), Hoffmann et al.
patent: 4094668 (1978-06-01), Yannopoulos et al.
patent: 4244734 (1981-01-01), Reynolds et al.
patent: 4244735 (1981-01-01), Reynolds et al.
patent: 4337226 (1982-06-01), Peasley
patent: 4389248 (1983-06-01), Iio et al.
patent: 4551213 (1985-11-01), Wilson
T. Okubo, T. Iio and M. Shuto, New Sumitomo Process for Gold Recovery from Copper Anode Slime, pp. 517-536, Proceedings of the AIME Annual Mtg. (1984).

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