Abstract:A method to precisely control the grinding fineness according to the grade ratio of silver to tin was put forward to solve the polarization of grinding particle size composition and the contradiction between the fine grinding of silver minerals and the coarse grinding of cassiterite in Yinman plant. In addition, a prediction model fitted to the grinding fineness and mineral liberation degree in the function of the grade ratio of silver to tin is used to solve the above problems. The non-linear fitting parameters show that a finer grinding fineness should be used to promote the monomers dissociation of sulfide minerals when treat the ore with high grade ratio of silver to tin. In addition, a relatively coarser grinding fineness should be adopted to reduce the over crushing of cassiterite when treat the ore with low grade ratio of silver to tin. Compared with the indexes before adjustment, the recovery rates of copper, silver, zinc, and tin can be increased by 6.44%, 11.08%, 16.37%, and 9.80%, respectively, achieving the prediction of grinding fineness and the efficient comprehensive utilization of the mainly valuable elements.