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Modelling the Specific Grinding Energy and Ball Mill Scale-up The proposed model combined with a model giving the ball-mill power draw is used for the ball-mill scale up. Comparisons with the charts or equations the number of mills and their dimensions (diameter length) and are estimated for a particular power draw.

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Mill Critical Speed Determination. 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. This is the rotational speed where balls will not fall away from the mill s shell.

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