After choosing the maximum diameter and minimum diameter of steel balls according to technological requirements, material properties, vertical roller mill specifications and various parameters, and then matching grade, using curves, the accumulative percentage of the mass of each corresponding steel balls loaded into the vertical roller mill can be found, the actual percentage of the mass can be calculated, and the loading quality of steel balls at all levels can be obtained.
According to the production practice of production enterprises, the relationship between ball diameter and material size is shown.
Steel balls are gradually worn out in the process of grinding materials. The wear of drop steel ball is related to its impact force. The wear of grinding steel balls is related to the surface area of steel balls. In general, the steel ball in the grinder has both impact and abrasion effects.
Because of the wear of steel balls in the mill production process, in order to keep the mill stable. Steel balls need to be added regularly.
The maximum diameter of additional steel balls is still determined by the method mentioned above. In addition to the addition of additional steel balls, several smaller diameter steel balls should be added according to production experience.
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