### Design Method of Ball Mill by Sumitomo Chemical Co., Ltd ...

Design Method of Ball Mill by Discrete Element Method ... son's ratio do not have a large effect on the ball motion.9) There is correlation between the coefficient of friction and grinding, and with gibbsite powder, it has been reported to be roughly 0.3–0.8,8) so we used 0.8 here. 2. Impact Energy of Balls Using the discrete element method, it is possible to obtain the collision frequency ...