Abnormal overflow concentration and fineness. During operation, the operator of the LUM ultrafine vertical mill also needs to check the overflow concentration and fineness of the cyclone regularly.Increasing overflow concentration or "overflowing roughness" is usually caused by increased ore concentration and clogging of the underflow port.If it is found that "overflow is running thick", first check whether the underflow port is blocked, and then check the feed concentration, and then adjust it according to the specific situation. If the underflow port is blocked, open the underflow port to clear the blockage.