If large-scale grinding mills want to control the fineness of the finished product, the powder separator is a very critical component. The separator of the vertical roller mill is mainly composed of shell, cage rotor, wind guide blade, transmission device, and other components. The existence of this device not only affects the quality of the finished product but also can greatly increase the output of the mill system. The classifier can be summarized as "dispersion", "classification" and "collection" three steps. "Dispersion" means that the material entering the classifier should be thrown away as much as possible, and a certain spatial distance should be formed between the material particles. Therefore, the structure of the material distribution plate, the speed of the material distribution, the size of the material distribution space, the moisture content of the material, and the material flow rate all directly affect the dispersion rate of the material. "Classification" means that after the materials are dispersed, in the limited time of staying in the powder separation room, the various forms of separation functions of the airflow should be fully utilized to separate the coarse and fine particles of the materials as much as possible and send them to their respective outlets. "Collection" is the ability to capture coarse and fine powder, which is related to the collection method and the structure of the collection part. Therefore, the gas flow rate, gas flow velocity, gas flow method, gas-solid intersection and flow field distribution, and the number and structure of the powder selection chamber have a great influence on the classification efficiency.

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