The most suitable number of work rotations in production is:

n = (0.76 - 0.88) × critical number n. Transfer / minute.

The actual production proves that when the filling rate of the grinding medium is 54%, the turning rate is set to 88% of the critical number of revolutions and the grinding productivity is higher than 76%; for the fine grinding (when the ore size is less than 3 mm, the grinding When the mineral product is below 0.1 mm, if the conversion rate is set to 88% of the critical number of revolutions, it is obviously high, which affects the quality and should be slightly lower.

78. Under what conditions can high-frequency grinding be used?

In the current production, the grinding machine's rotation rate is less than 76% of the critical number of revolutions, called low-speed grinding; when the revolution rate is higher than the critical number of revolutions of 88%, it is called high-speed grinding; the rotation rate is greater than 100 % is called supercritical revolution grinding.

The production practice proves that the ball mill with smooth lining has a medium filling rate of 30-40%, and at the same time appropriately reduces the grinding concentration, so that the ball mill rotation rate is increased to 100-104% of the critical number of revolutions. Under normal circumstances, the processing capacity can increase by 10-30%. Only when some of the above conditions are met can the high-rotation grinding be used, but it will also bring about the harm of reducing the fineness of grinding, so it is impossible to unilaterally pursue a high-speed grinding machine.

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