复杂硫化铜精矿微波活化预处理-加压浸出工艺

Microwave Activation Pretreatment and Pressure Leaching of Complex Copper Sulfide Concentrate

研究了以黝铜矿为主的复杂硫化铜精矿微波活化预处理-加压浸出工艺.结果表明,该精矿在微波功率82W、每批处理量95g及辐照时间120s条件下预处理后,矿石浸出性能显著改善.预处理过程中未见铅、锌、硫、砷等元素挥发损失.实验确定了微波活化铜精矿加压浸出工艺条件为:浸出温度453K,氧分压0.6MPa,初始硫酸浓度1.23mol/L,液固比5mL/g,浸出时间2.0h,木质素磺酸钙用量为精矿质量的1.25%,搅拌速度500r/min.在此条件下,铜、锌、铁浸出率分别达到86.36%,92.33%和27.64%.加压浸出渣经高温煤油溶解单质硫后返回作浸出配矿使用,可保障有价金属铜锌收率.

The microwave activation-pressure leaching technique of complex copper sulfide concentrate with tetrahedrite as the main mineral is studied.The results show that the leaching of complex copper sulfide concentrate is greatly improved after the microwave activation pretreatment under the following conditions：microwave power of 82 W,batch concentrate weight of 95 g,and handling time of 120 s.No loss of lead,zinc,sulfur and arsenic in the concentrate occurs during the pretreatment.The pressure leaching conditions of activated copper concentrate are further determined as follows：temperature of 453 K,oxygen partial pressure of 0.6 MPa,initial sulfuric acid concentration of 1.23 mol/L,ratio of liquid to solid of 5 mL/g,calcium lignosulphonate dosage of 1.25%（ω） of the concentrate,leaching time of 2.0 h,and agitation speed of 500 r/min.Under these conditions,the extraction rate of copper,zinc and iron is achieved at 86.36%,92.33% and 27.64% respectively.The leaching residues may return to the rationing of leaching materials for high recovery of copper and zinc after the residues are processed by high-temperature kerosene for deprivation of elemental sulfur.