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The "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface.

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The critical speed of the mill, &c, is defined as the speed at which a single ball will . Rod and ball mills in Mular AL and Bhappu R B Editors Mineral Processing

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The "Critical Speed" for a grinding mill is defined as the rotational speed where This is the rotational speed where balls will not fall away from the mill's shell.

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