**Summary：**When the double warehouse is milled, the length of the first warehouse is 30%-40% of the total length, and the length of the second warehouse is 60%-70% of the total length.

When the double warehouse is milled, the length of the first warehouse is 30%-40% of the total length, and the length of the second warehouse is 60%-70% of the total length. When the Sancang mill is used, the length of the first warehouse is 25 of the total length. %-30%, the length of the first warehouse is 25%-30% of the total length, and the length of the third warehouse is 45%-50% of the total length. For mills that are produced in an open flow, the fine grinding bin should be appropriately increased in length. This is also the case when producing high-strength grades of cement, in order to increase the fine grinding time of the material and to achieve the fineness requirements of the product. In the form of the partition plate in the mill, the number and size of the pupils of the partition plate should be appropriate. If the number of the holes is small, the size is too small, and the effective ventilation area of the partition plate is small, which increases the draft resistance and the material. The flow rate is also affected. If the number of pupils is too large or too large, the strength of the compartment board is insufficient, and it is easy to make the coarser particles enter the next compartment, the load is aggravated, and the joint work is out of balance.

The grinding efficiency of the material in the ball mill equipment is also related to the type, specification, grading and filling rate of the grinding body. Therefore, it must be chosen correctly and reasonably.

The aspect ratio of the ball mill is related to the production mode. For the mill of the open flow production system, to ensure the fineness of the product once, the length to diameter ratio is L/D=3.5-6; for the mill of the circulating flow production system, The flux of large materials should be L/D=2.5-3.5. The number of bins in the mill is generally 2-4 bins, the larger the aspect ratio, the more bins. According to the production practice experience, it is generally determined that the dry process is used to produce the mill;