Process for recovery of gold from refractory ores

Details Process for recovery of gold from refractory ores Process for recovery of gold from refractory ores

1990-05-03

1991-12-10

Andrews, Melvin J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 29, C22B 344

Patent

active

050714775

ABSTRACT:
The present invention is directed to an improvement in a process for the recovery of gold from refractory sulfidic auriferous ores which comprises oxidizing a slurry of ore with oxygen gas under pressure in the presence of sulfuric acid, neutralizing the oxidized slurry, cyanidizing the neutralized slurry to leach gold therefrom, and recovering gold from the resultant leachate. In accordance with the improved process, the oxidation of the ore slurry is carried out in a manner whereby, after a startup phase during which oxidation is initiated, the amount of sulfuric acid added to the ore slurry is sufficient to insure the oxidation of that portion of the sulfide sulfur in the ore which will allow recovery, by cyanide leaching, of at least about 80% of the gold in the ore. The oxidized slurry can be neutralized without a washing operation.

REFERENCES:
patent: 4571264 (1986-02-01), Weir et al.
patent: 4605439 (1986-08-01), Weir
patent: 4979987 (1990-12-01), Mason et al.

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