When the feeding is stopped, grinding aids (such as dry coal and quicklime) can be added to the cylinder. After the grinding sound of the ultrafine vertical mill returns to normal, first feed a small amount of material, and then gradually increase the feeding amount until it is normal. 

Always observe whether the current of the main motor of the ultrafine vertical mill increases. If the current increases, it means that the "full grinding" phenomenon of the ultrafine vertical mill has been eliminated, and the feeding amount can be gradually increased. 

Stop the machine to check the compartment board and grate board. If the above methods do not work, the method of stopping and grinding can be adopted. Empty all the steel balls and materials in the barrel of the ultrafine vertical mill, and at the same time clean the attached materials on the liner and steel balls, then reload the balls and start the operation.