Mechanism of oxidation and leaching for copper-bearing gold ores.

The Cu-bearing gold ores were extracted from Cu leaching residues at an oxygen partial pressure of 0.45 MPa and a temperature of 110 degrees C and subjected to oxidation in an autoclave. Extraction rates of 96.55% of Au and 90.3% of Cu were obtained. The effects of the acidity of the leaching system, temperature and NaCl concentration on the oxidation and leaching processes were analysed. The results showed that oxidation and dissolution of the sulphide ores occurred in the order pyrrhotite, sulphide, chalcopyrite and pyrite. High acidity and NaCl concentrations were favorable for the production of sulphur, the hydrolysis of Fe3+ and the leaching of Cu, and the Au extraction rate was significantly improved.
The Cu-bearing gold ores were extracted from Cu leaching residues at an oxygen partial pressure of 0.45 MPa and a temperature of 110 degrees C and subjected to oxidation in an autoclave. Extraction rates of 96.55% of Au and 90.3% of Cu were obtained. The effects of the acidity of the leaching system, temperature and NaCl concentration on the oxidation and leaching processes were analysed. The results showed that oxidation and dissolution of the sulphide ores occurred in the order pyrrhotite, sulphide, chalcopyrite and pyrite. High acidity and NaCl concentrations were favorable for the production of sulphur, the hydrolysis of Fe3+ and the leaching of Cu, and the Au extraction rate was significantly improved.