新疆某含石墨高钙次生硫化铜矿石选矿试验

新疆某含石墨高钙型次生硫化铜矿石铜品位为1.95%，次生硫化铜占总铜的92.82%，主要铜矿物为斑铜矿、辉铜矿、蓝辉铜矿、铜蓝，其他金属矿物有黄铁矿等；脉石矿物以方解石、石英、云母、高岭石等为主，并含有少量片状石墨。铜矿物主要呈浸染状、团粒状、不连续脉状、细脉状产出，粒径主要为0.037～0.15 mm，与黄铁矿、石墨等脉石矿物嵌布关系密切。为了确定该矿石的合适开发利用工艺，进行了选矿试验研究。结果表明，矿石在磨矿细度为-0.074 mm占85%的情况下进行1粗3精2扫流程处理，获得了铜品位为23.83%、铜回收率为75.06%的铜精矿1；精选尾矿合并进行1粗2扫浮选，精选尾矿合并粗选的粗精矿再磨至-0.038 mm占97%后进行3次中矿精选，获得了铜品位为13.01%、铜回收率为14.08%的铜精矿2，综合铜精矿铜品位为21.07%、回收率为89.14%的铜精矿，较好地实现了铜矿物的分离回收。

Beneficiation Experiments on Graphite-containing Secondary Copper Sulfide with High Calcium in Xinjiang

The grade of Cu in the graphite-containing secondary copper sulfide with high calcium from Xinjiang is 1.95%，and the content of secondary copper sulfide is 92.82% of the total Cu.The main copper minerals are bornite，chalcocite，digenite，and covellite.The other metallic minerals are pyrite.The main gangue minerals are calcite，quartz，mica，kaolinite，etc with a small amount of platy graphite.The copper minerals with the diameter of 0.037~0.15 mm mainly occurs in disseminated， granular， discrete vain-like，and veinlets forms，and are embedded tightly with pyrite，graphite and other gangues.The beneficiation experiment was conducted to determine the suitable process.The results showed that the copper concentrate 1 with copper content of 23.83%， recovery rate of 75.06% was obtained by the process of one roughing，three cleaning and two scavenging under the grinding fineness of -0.074 mm accounting for 85%.The copper concentrate 2 with copper content of 13.01% and recovery rate of 14.08% was obtained by the process of one roughing and two scavenging flotation of cleaning tailings，three cleaning of middlings after regrinding fineness of -0.038 mm accounting for 97% of the combination of cleaning tailings with coarse concentrate.Finally，total copper concentrate with copper grade of 21.07%，and recovery rate of 89.14% was achieved with proper separation and recovery of copper minerals.