Abstract:

The gold particle size of Sandaogou gold ore is fine and it is wrapped by sulfide minerals,it has a close relationship with arsenic,the gold leaching rate of arsenic-bearing gold concentratecanide is only 15%,and it is difficult to recovery use.Using bacterial oxidation-cyanide gold extraction process,under the experimental conditions of ore sizes is -0.040 mm accounting 95.00%(-0.075 mm,accounting for 99.50%),temperature of 42 ℃,the slurry pH value between 1.2 and 1.5,pulp density 15%,the bacterial oxidation time is 12 to 13 days,the gold leaching rate reach 95.00%～95.47%（Danyin）,94.20%～94.62%（Sandaogou） and 95.04%～95.11%（Danyin and Sandaogou accounting 50% respectively）,and the silver leaching rate reach 76%（Danyin）,74.21%（Sandaogou） and 75.11%（Danyin and Sandaogou accounting 50% respectively）,respectively,the indicator is more ideal,and we better resolve the refractory problem of arsenic-bearing gold concentrate.

Key words: Arsenic-bearing gold concentrate, Bacterial oxidation, Cyanide leaching, Gold extraction rate, Liaoning Province