Cement Machinery Parts Ball Mill Parts Cast Steel
From graph, Fig. 3, 12, mill having 6 ft 8 in. inside diameter will have 4400 lb of balls per ft of mill length. Assume material in voids weighs 10 of ball charge. W=4400 x 1.10=4840. From graph, Fig 5, at 40 mill volume, C R=0.510. A mill of 7 ft shell diameter and 2 in. liners has an inside radius R of 3.33 ft. C=(3.33) (0.51) = 1.70 ft. a=51.For overflow ball mills, the charge should not exceed 45 of the mill volume . For grate discharge mills, the charge should occupy about 50 of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,.