Abstract: A ZnSn polymetallic zinc sulfide ore,Zn,Sn,Fe,S content are 6.04%,1.05%,29.33%,19.08%.Zinc mainly exists in the form of marmatite,sphalerite,tin mainly exists in the form of cassiterite.Iron mainly exists in the form of pyrite,pyrrhotite,etc,which closely related to metal mineral symbiosis,parcel phenomenon common to each other.In order not to affect the subsequent tin separation,the flotation process of zinc was studied.The results showed that: when the fineness of ore is -0.074 mm accounts for 80%,the process of predesulfurization and ZnS floatation reseparation was adopted,and copper sulfate was selected as zinc mineral activator,butyl xanthate as collector,pinol oil as foaming agent,and lime as pyrite inhibitor.After one stage desulfurization,two roughing one scavenging ZnS mixed floatation,one roughing two scavenging ZnS separation,and ZnS separation tailings and ZnS mixed flotation scavenging concentrate,and separation of zinc and sulfur after 2 times of selection.Finally,the grade of Zn in zinc concentrate was 47.06% and the recovery rate was 90.76%.The test index is good.

Key words: Cassiterite polymetallic ore, Marmatite, Cassiterite, Desulfurization, Mixed flotation, ZnS separation