Abstract: There are 5.67% lead and 8.50% zinc in a mixed lead and zinc ore in Xinjiang.The ore has a high oxidation rate,and lead sulfide accounted for 76.01% of total lead,zinc sulfide accounted for 61.66% of total zinc.The useful minerals have complex dissemination,which liberate difficultly.To determine the appropriate beneficiation process,full bulk flotation and partial bulk flotation principle flow test were carried out.The results show that the index of partial bulk flotation is better than that of full bulk flotation process.The lead and zinc bulk concentrate with grade of 22.04% lead and 23.85% zinc,recovery of 71.56% lead and 52.39% zinc were obtained, via grinding (-0.074 mm 70%)one roughingtwo cleaningstwo scavenging closed flotation process.

Key words: Bulk flotation, Sulfide ore, Flotation