Abstract: To further improve the utilization level of the existing resource of Shizhuyuan Chaishao Lead-Zinc Mine, pilot test was made on its lead-zinc ore by adopting a process consisting of one-stage closed-circuit grinding (a grind of 77% -0.074mm), preferential flotation of lead by one roughing and one cleaning and then zinc flotation of also one roughing and one cleaning, with pilot cyclonic-static microbubble flotation columns.As a result, a lead concentrate grading 62.79% at  lead recovery of 89.81% and a zinc concentrate grading 52.24% at a zince recovery of 90.46% were obtained.In this way, not only the original process consisting two roughings-three cleanings-two scavengings for lead preferential flotation and one roughing-three cleanings-three scavengings for zinc flotation was simpliefied but the lead concentrate grade and recovery were improved by 12.58 and 0.88 percentage points respectively, and the zince concentrate grade and recovery by 1.98 and 8.95percentage points respectively.

Key words: Cyclonic-static microbubble flotation column, Flotation machine, Lead-zinc ore, Prefernetial flotation