关键词: 次生硫化铜矿, 石墨, 阶段磨浮, 中矿再磨再选

Abstract: 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.

Key words: Secondary copper sulfide, Graphite, Stage grinding-flotation, Regrinding and reflotation of middling