氧压渣非氰体系浸金及其机理

Gold leaching of high pressure acid leaching residue using a non-cyanide system and its mechanism

以氧压渣为原料,考察酸性硫脲体系和碱性多硫化物体系碳浸法浸金效果,对浸出过程矿相行为进行分析。结果表明:碱性多硫化物体系较酸性硫脲体系金浸出率高30%,碱性多硫化物体系包裹金得到释放和暴露,利于金的高效浸出。在碱性多硫化物体系下考察各因素对金浸出率的影响并确定最优浸出条件,在最优条件下,金的浸出率达85%以上。开展深度浸金研究,超声波强化金浸出率达89.77%,超细磨金浸出率达91.95%。

Using oxygen pressure leaching residue as raw material,the leaching behavior of carbon leaching in acidic thiourea system and alkaline polysulfide system was investigated,and the mineralogical change during leaching was analyzed.The results show that the gold leaching rate using the alkaline polysulfide system is 30% higher than that of acidic thiourea system,and gold is exposed and released in alkaline polysulfide system,which is conducive to the efficient leaching of gold.The influences of various factors on the gold leaching rate were investigated in the alkaline polysulfide system,and the optimum leaching conditions were determined.Under the optimal conditions,the gold leaching rate is over 85%.A study on enhanced gold impregnation is carried out,the ultrasonic gold leaching rate reaches 89.77%,the leaching rate of ultrafine ground gold reaches 91.95%.