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read moreAug 23, 2018 · to maintain the position of the ball in the mill, the condition c ≥ p should be satisfied, if the angle becomes 90 o . where d is in meters. generally, the mill speed is maintained at 70 to 75% of the critical speed.
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get priceFor instance a 90cm diameter ball mill with a critical speed of 44 rpm has an optimal speed of 31 to 33 rpm.
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