Abstract: Took a lead zinc mixed concentrate of Sichuan which containing lead 0.85% and zinc 6.53% as the research target, through contrast tests of 4 different kind of ore dressing technology process, got it's feasible of process of lead dressing first then zinc sulfide zinc oxide mixed dressing, lead concentrate of grade 51.16% and recovery rate 64.84% and zinc concentrate of grade 50.03% and recovery rate 90.23% were obtained in closed-circuit test, products were all meet the quality demanding of YB114-81 fifth class.

Key words: Lead and zinc sulfide ores, Lead oxide and zinc oxide ores, Lead-zinc ore, Flotation