The rotational speed, the ore quantity and the concentration of the ball mill are the main operating parameters of the grinding process and have a direct influence on the grinding results. The results of the self-grinding parameters of the vertical coaxial centrifugal mill with pyrite as raw material show that:

The speed of the Ore Milling Equipment and the amount of ore feed have a significant effect on the grinding effect. According to the actual situation to determine the four main mill speed were: 250rpm, 300rpm, 350rpm and 400rpm, the amount of ore with the mill to adjust the speed of change, through the four major mill speed test found, The cumulative yield of the product increases with the decrease in the amount of ore feed, but as the amount of ore is gradually reduced, the increase in negative cumulative yield is slowed down. Indicating that the same mill speed, with the gradual reduction of the amount of ore to the product, the average particle size is gradually reduced in the product, the proportion of 38 microns below the larger part of the mill that fine grinding and ultra-fine Grinding effect is obvious, with the mill speed increases, the mill's processing capacity to improve rapidly, while the average product size is also rapidly reduced, confirmed to improve the mill speed can greatly improve the grinding efficiency of the mention of learning.

The grinding concentration has a certain effect on the grinding effect. When the grinding concentration of 55%, the product of a grain of the smallest negative cumulative yield, grinding effect is relatively poor, and grinding concentration of 60% -70% of the product size is closer, when the grinding When the ore concentration is 70%, the viscosity of the pulp is large, which will cause the discharge to be not smooth. Therefore, it is appropriate to select the grinding concentration of 60% to 65%.

The results show that the Ore Milling Equipment efficiency increases with the increase of the rotational speed, and the higher the rotational speed is, the more favorable the fine grinding is. The results show that the grinding efficiency increases with the increase of the rotational speed. The A similar conclusion can be drawn at each different rotational speed, that is, the new yield of the grinding product decreases with increasing ore feed, but the gradient gradually increases. When the amount of ore is small, the product -400 mesh content is high, is conducive to ultra-fine grinding; when the larger amount of ore, the product of the distribution of the particle size is relatively uniform.

The grinding dynamics of vertical coaxial centrifugal mill with different grinding speed is studied. It is found that the formula of the grinding kinetic equation of the grinding product can be obtained by derivation. Of the method, can be obtained at different mill speed when the specific grinding dynamics equation, which can be obtained at any time, any size of the grinding product distribution rate.

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## Analysis of Grinding Effect of Ball Mill

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