Hello, adding steel balls depends on the grinding quality of ball mill. In general, it is better to control the ball loading of conventional ball mills at about 40-50%. The reasonable state can be checked by observing the ball mill barrel, and the steel ball in the barrel should be lower than the horizontal line of the barrel, which can not only effectively ensure that the steel ball in the ball mill can fall freely, but also improve the impact force of the steel ball in the ball mill and effectively complete the material grinding. The number of steel balls added every day is between 25 and 35. About 30 on average.