Method for recovering gold from refractory ores
A process for pretreating refractory ores improves the recovery of gold from such ores upon subsequent cyanidation. After comminuting the ore and forming an aqueous slurry, the ore is subjected to pressurized oxidation at an elevated temperature. By adjusting the pH to below about 1.85 and maintaining the pressure and temperature above 300 psig and 160.degree. C., respectively, very high recovery of gold can be achieved. Additionally, by maintaining a preselected soluble iron concentration in the slurry, the oxidation of the ore is promoted and proceeds at a more rapid rate.
Description
Patent History
Patent number: T104001
Type: Grant
Filed: Sep 26, 1983
Date of Patent: Mar 6, 1984
Inventors: Richard S. Kunter (Lakewood, CO), John R. Turney (Arvada, CO)
Application Number: 6/536,222
Type: Grant
Filed: Sep 26, 1983
Date of Patent: Mar 6, 1984
Inventors: Richard S. Kunter (Lakewood, CO), John R. Turney (Arvada, CO)
Application Number: 6/536,222
Classifications
Current U.S. Class:
75/118R;
With A Cyanide Compound (423/29);
204/119
International Classification: C01G 700;
International Classification: C01G 700;
