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In equation 8 14 D is the diameter inside the mill liners and Le is the effective length of the mill including the conical ends c is the specific gravity of the charge and

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attritors and ball mills how they work Union Process May 9 2000 A useful and simple equation describing the grinding momentum is M RPM TIP SPEED fpm Ball Mill 1/2 and larger 10-50 Attritor The theoretical critical speed of a ball mill is the speed at which the centrifugal force is Get Price

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derivation of critical speed of ball mill- crusher And Mill ball mill ball mill knowleage ball mill grinder-Shanghai The ball mill rotating speed is called critical speed when the outmost layer balls just rotate with the barrel and dont fall

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The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution The following shows how the size or select the matching mill required to draw this power is calculated from known tables 'the old fashion way'

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