#### feed size of coal to coal ball mill - Birthing Naturally

ball mill for mm feed size,coal mine south africa. Calculate and Select Ball Mill Ball Size for Optimum Grinding Based on his work, this formula can be derived for ball diameter sizing and selection: Dm = 6 (log dk) * d^0.5 where Dm = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm.