西藏某含金浸染状次生硫化铜矿石浮选回收铜金试验

西藏某浸染状次生硫化铜矿石铜品位为1.86%,原生硫化铜占总铜的15.05%,次生硫化铜占总铜的76.88%,主要铜矿物为斑铜矿、黄铜矿,其他金属矿物有黄铁矿、磁黄铁矿等;脉石矿物以石榴石、辉石、石英等为主。为了确定该矿石中铜、金的适宜回收工艺,进行了选矿试验。结果表明,矿石在磨矿细度为-0.074 mm占70%的情况下进行1粗2精快速浮选,1粗2扫常规浮选,快速精选1尾矿与常规粗选精矿合并再磨至-0.038 mm占80%的情况下进行1粗2精2扫铜硫分离,获得的快速浮选精矿铜品位为27.05%、金品位为8.28 g/t,铜、金回收率分别为60.79%、50.90%;常规浮选铜精矿铜品位为17.06%、金品位为5.02 g/t,铜、金回收率分别为29.81%、23.99%。快速浮选+常规浮选、快速精选1尾矿与常规浮选粗精矿再磨再选工艺流程既能避免铜矿物的过磨,保证铜的回收率,又可得到较高品位的铜精矿,获得较好的铜、金回收指标。

Experiment Research on Flotation Recovery of Copper and Gold from a Gold-bearing Disseminated and Secondary Copper Sulfide Ore from Tibet

The grade of Cu in the disseminated and secondary copper sulfide ore from Tibet is 1.86%. The content of primary copper sulphide is 15.05% and the secondary copper sulphide is 76.88% of the total copper. The main copper minerals are bornite， chalcopyrite， other metal minerals are pyrite， pyrrhotite， etc.； gangue minerals are mainly garnet， pyroxene， and quartz. The beneficiation experiment was conducted to determine the suitable copper and gold recovery process. The results show that the ore is subjected to one roughing， two cleaning instant flotation， one roughing and two scavenging conventional flotation in the case of grinding fineness of -0.074 mm accounting for 70%， the tailings of first stage instant flotation is mixed with conventional rough concentrate， and then reground to -0.038 mm accounting for 80%， and then via copper and sulfur separation of one roughing， two cleaning two scavenging conventional flotation， the obtained instant flotation concentrate with copper grade of 27.05%， gold grade of 8.28 g/t， copper and gold recovery rate are 60.79%， 50.90%； the copper grade of conventional flotation copper concentrate is 17.06%， the gold grade is 5.02 g/t， and the recovery rate of copper and gold are 29.81% and 23.99%. Through instant and conventional flotation， first stage instant flotation tailings and conventional flotation rough concentrate regrinding reselection process， copper minerals are not only avoided over-grinding， copper recovery is ensured， but also higher-grade copper concentrates are obtained， and better recovery indicators of copper and gold are obtained.