The ore is broken every time. The particle size is reduced to a certain extent. The ratio of the maximum particle size of the ore before crushing to the maximum particle size of the ore after crushing is called the crushing ratio.

For example, the maximum particle size of the ore before crushing is 400mm, and the maximum particle size after crushing is 100mm. The crushing ratio is:

i=D/d=400/100=4 (times)

Where: i - crushing ratio, times

D—the maximum particle size of the ore before crushing, in millimeters;

D-the maximum particle size of the ore after crushing, mm;

The crushing ratio indicates that the particle size of the ore is reduced by a certain amount of crushing, which is one of the important indexes of the crusher work.

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