Abstract: There is 8.78% antimony and 1.40% arsenic in a arsenic-bearing antimony ore from Russian.Antimony mainly exists in form of the stibnite，and arsenic mainly in form of arsenopyrite.Arsenopyrite are fine disseminated，a small amount of stibnite exists in arsenopyrite cracks，making it difficult to have stibnite efficient separation.In order to provide technical basis for beneficiation of the ore，flotation experiments was conducted on the ore.Results indicated that:with the grinding fineness of 75% -0.074 mm，using lead nitrate as antimony activator，humic sodium as arsenic inhibitor，butyl xanthate as collector，via one roughing-three cleaning-one scavenging closed circuit process，antimony concentrate with 59.22% antimony，0.73% arsenic，and antimony recovery of 84.58% is obtained.The test results provide technique basis for the concentration process determination of the ore.

Key words: Arsenic-bearing antimony ore, Flotation, Lead nitrate, Sodium humate, Butyl xanthate