Abstract: In order to comprehensively recycle and utilize the tailings resources of sulfide ore in Da ⁃ tun concentrator of Yunnan Tin Company，the exploration tests of gravity separation，magnetic separa⁃ tion，flotation and combined separation process were carried out systematically.The chemical composi⁃ tion，mineral composition and particle size distribution of the samples were analyzed.It was found that the tin content of the tailings was 0.12%，the iron content was 5.84%，and the particle size distribution was uniform.The test results show that the enrichment effect of single gravity separation，magnetic separation and centrifuge process on tin is not ideal.The combined process of desliming-flotation-magnetic separa ⁃ tion increases the tin grade of the flotation rough concentrate to 1.15%after desliming，and the recovery rate reaches 25.77%.The tin concentrate with tin grade of 2.15%and comprehensive recovery of 38.63% is obtained by further cleaning and closed-circuit test of the whole process.The effective recovery of cassit⁃ erite is realized.

Key words: sulfide ore tailings, desliming flotation, combined process