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Grinding. Ball Size by Fred C. Bond Selection media is one of the SIZE of grinding efficiency isand capacityprincipal factors affecting of tumbling-type grinding mills.

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This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

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b) Feed Preparation – With more widespread use of coarse ball milling it is increasingly important to present a suitable feed material top-size to the ball mill.

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