The LUM ultrafine vertical mill will cause the phenomenon of "bulging belly", that is, overload. At this time, the sound of the LUM ultrafine vertical mill is dull and weak, and the grinding effect will be lost.

At this time, the ore supply should be reduced or stopped immediately, the overflow concentration should be increased, and the ore supply should be resumed when the mill returns to normal operation.

And if the amount of ore is insufficient, the LUM ultrafine vertical mill will become finer and the amount of sand returned will decrease.

When the amount of ore feed is significantly insufficient, the sound of the impact of the liner and the steel ball will occur, resulting in the loss of the grinding medium and the liner.