Powder, influenced by the centripetal force, is absorbed up into the discharge nozzle (6),
together with air, and thick particles, influenced by the centrifugal force, can't pass through the classifier
so they go back to the grinding zone (8) to be grinded again. In order to make the particle size smaller,
rotational frequency of the air classifier should be increased. At this time, in order to prevent the phenomenon of
bottle-neck in the pulverizer, the speed of feeding a handling material into the pulverizer should be lowered
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