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For example using well established relationships between power draw and mill diameter and speed 50 mm (2 inches) of liner wear results in about 14 percent power increase (at constant loading and rotational speed) for a 2.4 meter (8 foot) diameter mill as opposed to only 6

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Fig. 2 shows the variation of the average torque and power with mill speed for the ball mill described above with a fill level of 50 . The torque increases slowly until the peak is attained around N=80 .As the amount of cataracting increases the balance of the charge improves and the torque required to maintain the asymmetric charge position declines steadily.

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For rod ball or pebble mills the peak is usually near Vp = .50 while actual observations as low as V= .42 have bean made in some ball mills (Rowland 1973). See Figure 2. Power draw is not significantly affected by the presence of the slurry in the mill.

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Ball-Mill Base with Ventilated Motor-Cover Installed Ball-Mill Base with Ventilated Motor-Cover Removed The Ball-Mill Drive System Looking inside the mill s motor compartment you can now see the motor with a small fan and pulley on its shaft. That small pulley is connected by a drive belt to a large pulley which is mounted on the unit s drive

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With particular reference to mill size it is apparent that a change in diameter in a large mill is relatively far less significant than the same change in diameter for a small one. For example using well established relationships between power draw and mill diameter and speed 50 mm (2 inches) of liner wear results in about 14 percent power increase (at constant loading and rotational speed

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The model is equally applicable to ball- semi-autogenous and autogenous mills and contains a description of the power draw of both the cylindrical section and the cone-ends.

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