High classification efficiency means that the qualified particle size can be discharged timely and efficiently, while low classification efficiency means that most qualified particle size products cannot be discharged and returned to vertical roller mill for regrinding, which is easy to cause over grinding.

In production, two-stage classification or improved classification equipment can be used To Improve Classification Efficiency and vertical roller mill grinding efficiency accordingly.

In the grinding process, there are many factors affecting the grinding efficiency of vertical roller mill. Many factors can only be analyzed and judged qualitatively, and it is difficult to make quantitative analysis.