云南东川某低品位难选硫化铜矿的浮选回收

Recovery of a Low-grade Refractory Copper Sulfide Ore by Flotation in Dongchuan,Yunnan Province

云南东川某铜矿含Cu 0.65%,其中次生硫化铜占有率达85.6%,铜氧化率9.6%;矿石中黄铁矿含量较高,铜硫分离难度较大,并含有较多的易泥化脉石矿物,属低品位难选硫化铜矿。针对该矿石的性质特点,对其进行了浮选回收研究,结果表明:以Ca O作p H值调整剂和铜硫分离时的抑制剂、Na2Si O3作分散剂和抑制剂,磨矿细度选择80%-74μm较为合适,Na2S用量600 g/t时可达到较好的沉淀、分散与活化效果,捕收剂优选为PAC,其最佳用量为120 g/t。在最佳条件下,采用"一粗-二精-二扫"的闭路流程,获得了较好的技术指标,最终精矿Cu品位和回收率分别达20.12%和90.39%。

A certain copper ore in Dongchuan, Yunnan province, with the copper content of only 0. 65 %, the distri-bution rate of secondary copper sulfide reaching as high as 85.6% and the copper oxidation rate of 9.6% , havingthe high content of pyrite which could lead to a difficulty in copper-sulfur separation, containing some easily-sliminggangue minerals, belongs to the low-grade refractory copper sulfide ore. Flotation recovery study based on the ore＇sproperties shows that, grinding fineness is more appropriate to be chosen as-74 μm 80%, Na2S, at the mount of 600g/t, has the better multi-function including precipitation, dispersion and activation, PAC should be chosen as collec-tor with optimal amount of 120 g/t when CaO is chose as pH regulator and depressant of copper-sulfur separation.Meanwhile,NazSiO3is used as depressant and dispersant. Finally, by adopting the closed-circuit flowsheet of oneroughing two cleaning two scavenging＇, the better technical index that copper grade and recovery of the final concen-trate can reach up to 20. 12% and 90. 39% respectively,was obtained under the optimum condition.