Calculation of grinding breakage rate based on discrete  element method in ball mills

XV Lixue, SUN Yi, LIANG Man, MAO Yalang

（Key Laboratory of Special Purpose Equipment and Advanced Processing Technology of Ministry
of Education, Zhejiang University of Technology, Hangzhou 310032, China）

Abstract: In order to solve the problem of　breakage rate formulas poor practical utility in ball mills, the affect of the property of particles and the collision energy distribution to breakage rate was analyzed. A discrete element method of breakage rate formula based on ball mills impact grinding model was presented. The collision energy distribution was obtained through DEM simulation and the parameters in breakage rate formula was determined. Then the breakage formula under the experimental condition was obtained. The results show that the breakage rate from the derived formula fits well with the one from empirical formula. The derived breakage rate formula provides an effective method of more accurately quantitative description of grinding process in a ball mill.

Key words: ball mill; breakage rate; discrete element method; collision distribution