Abstract: The flotation tailings of a copperzinc sulfide ore contain relatively highvalue tin elements,and its cassiterite inlay is uneven in particle size.The combined gravityflotation process is used to comprehensively recycle the cassiterite,and a tin concentrate with Sn grade of 20.64% and Sn recovery rate of 6005% is obtained through grading and gravity separation.In order to further improve the utilization of tin resources,the flotation test of gravity middlings and extremely finegrained ore was carried out.Under suitable regrind fineness,the Sn grade of 1.39% was obtained through physical and chemical combined desliming and flotation.The tinrich medium ore with Sn recovery rate of 5.36%,and the combined gravityflotation process finally recovered 65.41% of the tin in the tailings,providing a reference for the comprehensive utilization of tin resources.

Key words: flotation tailings of copperzinc sulfide ore, gravityflotation combination, grading gravity separation, desliming