Abstract: Dolong mine in Yunnan Hualian Zinc and Indiun Co.Ltd contains zinc,tin,copper,indium,silver,iron,sulfur and other useful minerals.Its mineral resources are abundant and the tin metal reserves have been exceeded more than two hundred thousand tons.However,due to the complex nature of the ore and a variety of useful minerals embedded in a smaller particle size,in particular,the cassiterite belongs to the fine-grained embedded and the-37μm grain size content of more than 70% and is difficult to choose.Over the years,the company through continuous technological transformation and innovation,worked out a set of fine cassiterite recovery for the whole shaker reelection process,and the comprehensive recovery rate of cassiterite is 45%.The low recovery rate of cassiterite is mainly due to the poor recovery of the fine-grained cassiterite at-37 μm,and the recovery rate of grain size is only 10 ~ 20%.Especially,the recovery rate of-10μrn fine-grained cassiterite is close to zero.In response to this situation,the company organized a systematic study of the process of mineralogical research and experimental studies,proposed for different sizes of cassiterite using different equipment and processes for coarse and fine sorting,namely for-37μm finegrained cassiterite,the use of predictive desliming + cassiterite flotation + shaker combination process;+ 37μm coarse grained cassiterite,the use of spiral chute + shaking the joint process.The process of coarse particle gravity separation + fine flotation not only improved the sorting conditions of the gravity process,and improved the recovery rate of coarsegrained cassiterite,but also gave full play to the advantages and characteristics of the flotation of the fine cassiterite,greatly improving the recovery rate of fine cassiterite,the total recovery rate of cassiterite by single shaking process 45% to the current more than 55%.