Abstract: According to the ore properties of a low grade copper-lead-zinc ore from Shaanxi, the paper adopted the principle flowsheet of copper-lead part-bulk flotation，with the Zn inhibitors T₈₀ and collector ester-12 for copper-lead flotation and Pb depressant T₈₁ developed by Northwest Research Institute of mining and metallurgy as key reagents. Through study on ore mineral processing experiment，the results show that the process of one roughing three cleaning one scavenging for copper-lead mix-flotation, one roughing one cleaning one scavenging for copper-lead separation, one roughing two cleaning one scavenging for zinc flotation and middlings returned in order to the flowsheet is adopted to treat the ore. The copper concentrate with Cu grade and recovery of 28.96% and 63.71%, associated Ag grade and recovery of 980.84 g/t and 17.95%,Lead concentrate with Pb grade and recovery of 45.37% and 81.87%, and associated Ag grade and recovery of 689.96 g/t and 36.05%, and Zinc concentrate with Zn grade and recovery of 50.44% and 89.36% were separately achieved.

Key words: Copper-lead-zinc sulfide ore, Copper-lead bulk flotation, Copper-lead separation, T₈₀, T₈₁