Abstract:The recovery of fine-grained cassiterite from a sulfide lead tailing mine in yunnan province was studied using the method of gravity and floating separation. This ore is seriously muddied. Firstly, the centrifugal concentrator is used to remove the fine-grained slime. Desliming eliminates the adverse effects of the slime on the subsequent flotation and increases the milling grade of tin ore. Centrifugal beneficiation can enrich the tin grade more than 5 times, and the operating recovery reaches 87.4%. Centrifugal concentrate is used to reverse flotation desulfurization. Sodium carbonate was used as a pH adjuster and dispersant, BY-9 + P86 was used as a combined collector, and CMC was used as a depressant of gangue minerals to carry out positive flotation of the desulfurized concentrate. At last, the closed - circuit experiment result is that the tin concentrate grade and recovery are 18.5% and 65%, respectively. The results show that the combination of gravity and flotation methord has a good effect on the separation of fine cassiterite by centrifugal concentrator.