The Experimental Study on Gold Extraction from the Refractory Gold Ore
The refractory gold ore are important raw materials for gold extraction.This article investigates the mineral properties of a refractory gold ore,the Au direct leaching test and the roasting-acid leaching pre-treatment followed by Au leaching test.It is found that Au in the raw ore contains both mineral and physical inclusions.The direct leaching test of Au studied the effects of factors such as ore fineness,type of leaching agent,and leaching time.Under the optimal test conditions,the leaching rate of Au is 48.27％.The roasting-acid leaching pretreatment test studied the effects of factors such as roasting temperature,roasting time,acid leaching solution concentration,acid leaching slurry concentration,and acid leaching time on the pretreatment effect.The optimal pretreatment conditions are obtained as roasting temperature of 675 ℃,roasting time of 1 hour,acid leaching solution of 15％sulfuric acid,acid leaching slurry concentration of 25％,and acid leaching time of 2 hours.The Au leaching rate of the pre-treated ore can reach 84.18％,providing a basis for subsequent industrial design..
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