Tubular ball mills sciencedirect,jan 01, 2016 the balls occupied 28% of the mill volume. the mill was rotated at 65% of the critical speed. the work index of the ore was 11.3 kwht. estimate the size of the mill required. 7.7. wet overflow ball mill of dimensions 3.05 3.05 was charged with nickel ore of density 4.2 having a value of 2.2 mm. the mass of balls
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