Practical advanced & comprehensive guide for ball mill design .May 23, 2017 . 4.1 1.1 Mill Speed; 4.2 1.1 Mill L/D and Chamber Lengths. 4.2.1 1.1.1 L/D; 4.2.2 1.1.1 Chamber Lengths; 4.2.3 1.1.2 FLS Combidan Design Philosophy. 4.3 1.1 Quality criteria in mill and at mill exit. 4.3.1 1.1.1 CEMENT Ball Mill; 4.3.2 1.1.1 RAW ball mill. 4.4 1.2 Ball charge filling level. 4.4.1 1.2.1 LAFARGE.selection criteria of vrm and ball mill,VRM vs Ball Mill for Cement Grinding - Page 1 of 1 - International .VRM has less flexibility in controlling particle size distribution. Overall ball miil is good option for Cement mill but only has limitations for higher capacity, as two ball mill to be installed for One VRM, but in case of breakdown one ball mill can be in operation. Trust this clear your clarifications on equipment selection for cment.