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Figure 3-7: Influence of % of critical speed top and % of mill filling bottom on Figure 4-13: Power draw of the ball mill J=30% φc=75% and db=25 mm .

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SAG mills of comparable size but containing say 10% ball charge in addition to the rocks normally operate between 70 and 75% of the critical speed.

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information on ball mills. where the mill becomes a centrifuge is called the "Critical Speed" and ball mills usually operate at 65% to 75% of the critical speed.

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