Abstract: There are many kinds of minerals in a lead-zinc polymetallic ore in Guangxi.The grade of Pb,Sb,Zn,S and Ag is 2.75%,2.33%,12.24%,28.27% and 96.08 g/t,respectively.It is belongs to a high-grade complex and refractory tin-associated polymetallic sulphide ore.In order to provide a basis for the determination of ore dressing process,the flotation process was studied.The technological process of prioity separation lead,and zinc flotation from lead tailings is determined.In lead flotation,zinc sulfate + sodium sulfite was used as combined inhibitor to drepress sphalerite,sulfuric acid as activator,LW-01 as collector,via one roughing two cleaning two scavenging jamesonite flotation.Lead tailings using lime + y-As as inhibitor to depress pyrite and arsenopyrite,copper sulfate as activator,butyl xanthate as collector,via one roughing two cleaning two scavenging zinc flotation.Through closed circuit test,the lead-antimony concentrate with lead grade 26.93%,antimony grade 23.35%,zinc grade 5.45%,silver grade 960 g/t,lead recovery 87.91%,antimony recovery 87.82%,silver recovery 86.98%,zinc concentrate with zinc grade 48.67% and zinc recovery 94.22% can be obtained.

Key words: Separation of Pb and Zn, Priority flotation, Combined inhibitor, Jamesonite, New collector