Before sand making, the more fine powder contained in the material, the more influence the sand making, because these fine powder are easy to adhere and affect the transportation. Therefore, the material with a large amount of fine powder should be screened in advance, and the fine powder should be screened out from the material as far as possible, so as not to affect the normal operation of vertical roller mill.
If the water content is high, the material is easy to adhere when grinding in the vertical roller mill, and it is also easy to block in the process of feeding and conveying, resulting in the reduction of sand making capacity.
To solve this problem, first of all, the humidity of materials should be strictly controlled when selecting materials. If the humidity of materials is too high, sunshine or air drying can be used to reduce the percentage of moisture in materials.