Generally, the grading range is 25% ~ 35%, but the intermediate grading in practical application is mostly 28% ~ 32%. LM vertical roller mill steel ball grade ratio under common economic operation: steel ball diameter mm Φ one hundred Φ eighty Φ sixty Φ forty Φ 20 mass / total filling quantity 7.5% 6.9% 33.5% 30.1% 22 note: when the grindability of materials is poor or the grinding requirements are fine, the filling rate of one bin shall be & gt; 28%。

Unreasonable grinding aid dosage LM vertical roller mill grinding can add a small amount of grinding aid without damaging the product performance, which can not only accelerate the crack propagation in material grinding, reduce the mutual adhesion between fine powders, effectively improve the grinding efficiency, but also improve the energy-saving efficiency of LM vertical roller mill.

However, LM vertical roller mill grinding aid shall be added according to the amount specified in the national standard. In the general cement production process, the addition amount of grinding aid shall not exceed 1%.