Abstract: In order to solve the problem of poor separation effect caused by low tin grade，large mud content and fine disseminated particle size of raw ore in a tin mine in Yunnan，the beneficiation process test is carried out according to the properties and material composition of tin ore.Through the comparison of the grinding and gravity separation processes under the two conditions of desliming and non-desliming of the raw ore，it is determined that the process of grinding and gravity separation after desliming is adopted for the raw ore，and some tin minerals are effectively recovered.In order to further improve the recovery rate of tin， flotation tests under different conditions are carried out on the gravity separation medium ore，and the flota⁃ tion conditions are optimized. Finally，the combined process flow of raw ore desliming-rough grinding-mag⁃ netic separation iron removal-shaking table gravity separation-medium ore regrinding-flotation is deter⁃ mined.Under the optimum process parameters and flotation reagent system，the sorting index of comprehen⁃ sive concentrate tin grade of 48.67% and the total tin recovery of 71.58% are obtained through the whole pro⁃ cess closed-circuit test.

Key words: tin ore, gravity separation, flotation, efficient recovery