#### Solved The critical speed of the ball mill is less than 45% Chegg

The ball mill is the equipment used to blend the material or grind the material in fine power by usi... The critical speed of the ball mill is less than 45% of operating speed. Now calculate the operating speed of the ball mill which has diameter of 900 mm. Diameter of ball is 80 mm. a) 47 rpm b) 68 rpm c) 32 rpm d) 21 pm.