Research on enhanced thiourea leaching of gold from roasting sand by super leaching
Using roasting sand as raw material,the acid washing pretreatment process was first carried out to achieve the removal of arsenic,while removing other impurities and reducing the consumption of thiourea.The effect of sulfuric acid concentration on the leaching rate of arsenic,iron,copper and zinc was investigated,and the acid washing ore phase behavior was analyzed;at the same time,a comparative study was conducted on the leaching of gold using super leaching and conventional acid thiourea systems.The results show that acid washing pretreatment can effectively remove harmful element arsenic.Under optimal conditions,the leaching efficiency of arsenic,iron,copper and zinc are 96.3%,0.5%,22.7%and 7.6%,respectively;super leaching can reduce particle size,enhance reaction kinetics,achieve deep dissociation of encapsulated gold,and effectively improve the leaching efficiency of gold.The leaching efficiency of gold in the conventional acidic thiourea system is only 54.6%,and the leaching efficiency of gold after 10 min of reaction using the super leaching process reaches 84.6%,which can achieve efficient gold leaching.
NETL
NSTL
万方数据
维普
