#### AMIT 135 Lesson 7 Ball Mills & Circuits Mining Mill

It has been recognized that the grindability of an ore in a ball mill is a function of both feed and mill parameters Work index W i; Largest particle size and size distribution; Density of solids and slurry; Mill diameter; Rotational speed; Rowland and Kjos 1980 defined the largest ball size needed based on these parameters dâ† B = [ Fâ† 80 / k â† Ï â† s