Starting from the properties of the ore cassiterite multi-metal sulfide ore. The ore characteristics of No. 91 rich ore body in Dachang tin mine in Guangxi were discussed. The problems existing in the previous principles and processes used in the trial and production of No. 91 rich ore body were analyzed. Furthermore, the new beneficiation process “heavy (Taiwan)-float-heavy†process was studied. The process solves the contradiction between the recovery of the cassiterite and the sulphide ore in the grinding degree, and the separation index of tin and zinc has been greatly improved; the production has been applied for many years, the production is stable, the technical index is good, and the technology has been obtained. Significant economic benefits.
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