When the other conditions remain unchanged, the ball mill grinding media movement in the cylinder depends on the speed of the Ore Milling Equipment. Medium movement state is different, grinding effect is not the same. When the rotational speed of the ball mill is low, the medium is mainly flatter-down, the impact is smaller, the grinding effect is mainly grinding, the ball mill production capacity is low, suitable for fine grinding; when the speed is high, the medium throws the movement mode The proportion of increased, the impact of strong, grinding to the impact of the main, stripping stripping, is conducive to crushing coarse grain materials, ball mill production capacity. The filling rate of the ball mill is different, and the required speed is not the same when the useful power reaches the maximum value. The higher the filling rate, in order to ensure that the innermost ball can also be in the throwing movement, requiring the roller ball mill speed higher, in order to make the maximum useful power, so that the ball mill has the greatest productivity.
According to the theory of medium motion, the suitable working speed of the ball mill is 76% and 88% of the critical speed respectively. The speed of the ball mill in our country is between 75% and 80%, which is slightly lower than the theoretical calculation. In the actual production, the ball mill the appropriate speed through the long-term production comparison test to determine. In contrast, not only to see the level of production capacity of the mill, but also depends on power consumption, steel consumption and economic benefits.
The results of the long-term industrial scale comparison of the 1100 series of 3200mm × 3100mm ball mill in China are as follows: the ball mill speed is changed from 18r / min (rotational rate of 74.3%) under the condition that the filling rate is 44% ~ 48% ) Increased to 19.8r / min (transfer rate of 81.72%), the whole plant annual processing increased by 45,800 tons of ore, but because of the annual power consumption increased by 6.574 million kw / h, liner more consumption of 388.48t, Concentrate costs increased by 0.38, resulting in the whole plant due to Ore Milling Equipment speed increase and less profit 567,900 yuan. That is, the increase in production is not income.
Of course, if you encounter the ball mill production capacity can not reach the design output quota, the appropriate increase in the speed of the ball mill, is still considered to improve the processing capacity of the concentrator one of the effective measures. But the ball mill speed increases, the vibration and wear and tear, we must pay attention to strengthen management and maintenance. On the contrary, if the ball mill production capacity is surplus, it should be appropriate to reduce its speed to reduce energy consumption and steel consumption, reduce grinding costs.
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