The main function of the ball in the ball mill is to crush and grind minerals, so the proportion of balls in the ball mill is to meet the purpose of crushing and grinding minerals. The crushing effect directly affects the grinding efficiency, and ultimately affects the overflow output of the ball mill. The gradation of ball loading is directly related to the crushing effect. The ball loading gradation includes the size of the ball loaded, the proportion of the balls of various specifications, the series of ball diameters, etc. These parameters are mainly affected by factors such as the specifications of the ball mill, the internal structure of the ball mill, and product fineness requirements, and at the same time, the characteristics of the materials entering the mill should be considered.
First, the ball must have enough impact force, so that the ball has enough energy to crush the grinding material, which is directly related to the maximum diameter of the steel ball.
Second, there must be enough times of impact before the sphere can crush the material, which is mainly affected by the average sphere diameter of the sphere and the filling rate of the sphere. When the loading amount is certain and sufficient impact force is ensured, the number of impacts on minerals can be increased by reducing the diameter of the spheres and increasing the number of spheres, and the crushing efficiency can be improved.
Third, in order to ensure that the material has sufficient grinding time in the mill, the spheres should have a certain ability to control the flow rate of the material to ensure that the material is fully pulverized.
two-level ball rule
Use two spheres of different specifications for grading, and the diameters of the two spheres are quite different. The main reason is that the small balls are filled between the large balls, which can significantly increase the bulk density of the steel balls. Its main function is to improve the impact capacity and impact times of the mill. In addition, the higher bulk density can make the material obtain sufficient grinding effect.
In the two-stage ball distribution rule, the main function of the large ball is to impact and crush the material, and the small ball is to fill the gap of the large ball to improve the bulk density of the ball, control the flow rate of the material, and increase the grinding capacity; the second is to play the role of energy transfer. , transfer the impact energy of the big ball to the material; the third is to expel the coarse-grained material in the gap and place it in the impact area of the big ball.
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Post time: Jun-06-2022