关键词: 复杂铜精矿, 黝铜矿, 微波活化, 预处理, 加压浸出

Abstract: 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%(w) 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.

Key words: complex copper concentrate, tetrahedrite, microwave activation, pretreatment, pressure leaching