Process for the recovery of noble metals from ore-concentrates

Details Process for the recovery of noble metals from ore-concentrates Process for the recovery of noble metals from ore-concentrates

1986-09-23

1988-11-22

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 2, 75 97A, 75101R, 75106, 75108, 75115, 423 29, 423 34, 423 41, 423 42, 423 45, 423 87, 204109, C22B 1104

Patent

active

047863234

ABSTRACT:
A process for the hydrometallurgical recovery of gold and silver by direct oxidizing sulphuric acid-digestion of arsenopyrite-concentrates (FeAsS.sub.2) containing carbonaceous materials with a silicate gangue, and/or a silicate and pyrite gangue whereby arsenic and iron are fully solubilized and the noble metals are quantitatively enriched in the silicate-residue. The concentrate is subjected to mechano-chemical stress to produce structural deformations before being digested in the presence of oxygen. After decarbonization of the residue, gold and silver can be recovered by cyanide leaching without losses due to adsorption. A bulk process for preparing gold and silver rich concentrates is also disclosed.

REFERENCES:
patent: 4571263 (1986-02-01), Weir et al.
patent: 4571264 (1986-02-01), Weir et al.
patent: 4610724 (1986-09-01), Weir et al.
patent: 4615731 (1986-10-01), Thomas et al.
Ullmanns Enxyklopadie der Technischen Chemie, Verlag Chemie, Weinheim/Bergstr., 1974.
Pawlek, F., Metallhuttenkunde, Verlag Walter de Gruyter, Berlin, New York, 1983, p. 639.
Gerlach, J. et al., Einfluss des Gitteraufbaus von Metallverbindungen auf ihre Laugbarkeit, Erzmetall, 1972, p. 450.
Gold Recovery from Arsenopyrite by the Arseno Process, Western Miner, Mar. 1983, p. 21.
Gock, E., Measures for Reducing the Energy Requirement During Vibration Grinding, Jan. 20, 1979.

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