Effect of Slurry Solids Concentration and Ball Loading on 02/03/2014· The ball mill utilized in the sampling survey has an inside diameter of m and length of m and is run in open circuit Under normal operating conditions the mill ball loading is 30% of total mill volume mill rotational speed is 75% of critical speed slurry solids concentration is 75% solids feed rate is 330 tph Experimental Program Procedures The literature [5 10] presents