The ore dressing workers strive to find the most suitable working speed for grinding and swaying, in order to obtain the best grinding efficiency, and put forward various different viewpoints. Only two kinds are introduced:
The former is only the outermost ball in the best working state, the other layers of the ball grinding effect is not good; the latter is only the middle layer ball is in the best working state, the grinding effect of the ball outside the middle layer and inside the ball is not it is good. The working speed calculated by these two formulas is lower than the critical speed.
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