2 x FLS Ball Mills excl. MotorDrive For SaleReAssignment Mill Details Type of Mill FLS Ball Mills set of 2 Mill Dimensions 7925 x 12344 mm 26x406 Diam x L Default Mill Speed 11.41 RPM Mill Speed 10.65 to 12.17 RPM Liners MetalRubber Excluded Mill Drive Motor Type Wrap Around GMD Mill Drive Motor Size 16,400 kW 21,993 hp.8.3.2.2 Ball mills The ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1–1.5 times the shell diameter Figure 8.11 The feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20–40 water by weight.