关键词: 次生硫化铜矿石, 快速浮选, 粗精矿再磨, 铜硫分离

Abstract: 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.

Key words: Secondary copper sulphide ore, Instant flotation, Rough concentrate regrinding, Copper and sulphur separation