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• Centrifugal force keeps the ball in contact with the mill wall. • Due to centrifugal force, if the speed of rotation of mill is faster, the balls are carried to more distance. • Centrifuging: In case of too high speed, balls stick to mill wall and are not released Critical speed

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2. Calculate the efficiency based on combined effectiveness. 4) Calculate the power required to crush 50 tons/hr. of Bauxite if 80% of feed passes 3 in. screen and 80% of product passes 0.5 in. screen. The work index is 8.78. 5) What speed of rotation in revolution per minute would you recommend for a ball mill 1200 mm in diameter with 75 mm balls?

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ball mills. The ball charge in each mill is approximately 22 tons. Equa1 weights of 2 and 2 1/2 inch forged steel balls are used for charge make up. Each ball mill is driven by a 400 hp, 4160 volt, motor geared through a pinon shaft to the ball mill. Operation of the ball mills is maintained at 20 rpm or 83% of critical speed. The ball discharge

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