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A ball mill with a gape diameter of 2.0 m and a ball diameter of 50 mm is used to grind 3.5 metric tons

A ball mill with a gape diameter of 2.0 m and a ball diameter of 50 mm is used to grind 3.5 metric tons of granite. What is the critical speed of that mill? Ncrit 60 2g 2 D-d

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