Experimental Research on Extracting Technologies of Gold from a Refractory Ore Containing Sulphur and Arsenic

Under the conditions of using conventional cyanide leaching and thiourea leaching technologies,the leaching rates of gold from flotation concentrate of the refractory ore containing sulphur and arsenic are both low.The leaching rates of gold are 31.52% and 33.71%,respectively.To this end,the experimental research on biooxidation pretreatment was performed.The conditions used in the thiourea leaching of gold were explored,and the research on leaching gold with thiourea promoted by magnetic field was carried out.The results showed that by using the combined technology of biooxidation pretreatment and thiourea leaching of gold intenified by magnetic field,the leaching rate of gold reached 90.06%.