## crushing efficiency formula of a ball mill

formula amp 39 s to calculate efficiency of ball mill - . Crushing Efficiency Formula Of A Ball Mill. Ubc mine331 lecture notes - sagmilling. nov 11, 2015 . devices is (largely) reflective of the efficiency of the grinding device. .. the ef4 formula requires both the rod mill and ball mill work index (rod mill wi is . from a primary crusher product size, f80, to a ball mill cyclone overflow.