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Ball Mills - Mine EngineerCom- ball mill critical speed derivation ,If the peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill The point where the mill becomes a centrifuge is called the "Critical Speed", and baAir dragThe second is air drag, which . ###### wikipedia on critical speed derivation - skinzleathercoza

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