The addition ratio of the ball mill steel ball size shall be determined according to factors such as the diameter of the ball mill, the hardness of the ore, the particle size of the ball mill, the hardness (mass) of the steel ball, and the speed of the ball mill. When the model of the ball mill is determined, the speed of the ball mill is also determined. The hardness of the ore is measurable. The ore particle size of the ball mill is determined by changing the size of the grid screen. Generally, the newly installed ball mill has a running-in process. During the running-in process, the amount of steel balls is added for the first time, accounting for 80% of the maximum ball loading capacity of the ball mill. Φ100㎜, Φ80㎜, Φ60㎜, Φ40㎜). The added weight of the steel ball is based on the quality of the steel ball and the quality of the steel ball, which determines the amount of ore added per ton. It is best to use new wear-resistant steel balls. The best (good quality) steel ball addition is calculated based on the amount of ore processed per ton (that is, 0.8㎏ per ton of ore is added). General steel balls need to handle 1 ton of ore (1㎏—1.2㎏). The ratio of the ball mill steel ball depends on the effective length of your mill, whether it is equipped with a roller press, how large the feed size is, what liners and structures are used, the expected fineness of the screen and the ratio table, how many chrome balls are used, and the speed Comprehensive judgment of how many factors. The general steel ball gradation is 120mm 100mm 80mm 40mm, if you use high chromium ball, you must ask the manufacturer to add rare earth during production. The problem of the ball mill steel ball addition during the running-in process. Why is the ball mill steel ball amount added only 80% during the ball mill running-in process? After the ball mill is installed, the size and gear of the ball mill need to mesh, and the processing capacity should be gradually increased. After running for two or three days, check the meshing of the large and small gears. When everything is normal, open the manhole cover of the ball mill and add the remaining 20% ​​steel balls a second time. The addition of small steel balls is only the first time to add balls. Because the normal friction between the steel ball and the steel ball, the steel ball and the ore, the steel ball and the ball mill liner during normal operation of the ball mill will increase the wear, making the large ball small and the middle ball small. Therefore, under normal circumstances, there is no need to add a small ball. In the case of adding small balls, there is no monomer dissociation in the useful mineral particle size. When the fineness of the mill can not meet the flotation requirements, an appropriate amount of small balls can be added. The steel ball in the ball mill is constantly worn during operation. In order to maintain the ball load filling ratio and the reasonable ratio of the ball and maintain the stable operation of the ball mill, it is necessary to perform reasonable ball refilling and low wear and tear.