Introduction: A vertical mill is mainly used as a device for ultrafine powder production. The particle size of the materials produced by this equipment is a concern for users. So, how can a vertical mill ensure the fineness of the finished materials produced? Today we will discuss this issue.

　　When processing materials in the production line, the vertical mill adopts the principle of layer grinding, which can ensure that the finished materials have good particle shape. The vertical mill equipment is mainly used to produce materials that meet market demand, so the fineness ratio of the produced materials is more important. Generally speaking, the crushed materials are brought into the powder selection machine for fineness classification by the circulating airflow at the inlet. This process is the key to ensuring high-quality ultrafine powder production. From this description, it can be seen that the airflow and wind speed of the vertical mill equipment play a crucial role in determining the particle size of the finished product after production.

　　Strictly speaking, in the process of material production, the vertical grinding equipment generally crushes the materials under the drive of the quantitative system wind speed. The materials with the required particle size enter the collector with the airflow to become finished mineral powder. The materials with particle size that do not meet the requirements will fall into the grinding chamber of the vertical mill again under the action of gravity for secondary powder selection, thereby ensuring the uniform particle size of the produced finished product.

　　Therefore, adjusting the wind speed and air volume of the vertical mill is a key factor in determining the production rate of qualified materials. This is a problem that manufacturers attach great importance to in the production process. The adjustment of the air volume of the vertical mill system in the grinding production line is generally achieved through two methods: on the one hand, by controlling the particle size of the material, and on the other hand, by adjusting the wind speed of the circulating airflow and the thickness of the material layer.

　　The operating principle of the circulating airflow inside the vertical mill is different from that of the air velocity at the discharge port. In order to improve production efficiency, the air velocity in the discharge port pipeline is generally controlled at 20m/s or above.

　　In addition to the wind speed mentioned above, there are many factors that affect the fineness of finished materials. From the current situation of China's grinding industry, the ultrafine grinding process of raw materials by vertical mills is the current material processing solution in China. The application of this equipment in production lines can reduce slag discharge, lower energy consumption, and higher qualification rate, greatly improving production efficiency.