### Tubular Ball Mills

The mill was expected to produce a product of 80% passing 150 μm The feed rate to the mill was 300 t/h The ball mill grindability test at 65 mesh showed 12 kWh/t The internal diameter of the ball mill was 5 03 m and the length-to-diameter ratio was 0 77 The steel balls occupied 18% of the mill The total load occupied 45% of the mill volume

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