How to Load Balls into a Ball Mill

How to Load Balls into a Ball Mill

1. The main function of the steel ball in the ball mill is to impact and crush the material, and also play a certain role in grinding. Therefore, the purpose of grading steel balls is to meet the requirements of these two aspects. The quality of the crushing effect directly affects the grinding efficiency, and ultimately affects the output of the ball mill. Whether the crushing requirements can be met depends on whether the gradation of the steel balls is reasonable, mainly including the size of the steel balls, the series of ball diameters, and the number of balls of various specifications. Proportion etc.

2. To determine these parameters, in addition to considering factors such as the size of the ball mill, the internal structure of the ball mill, and product fineness requirements, the characteristics of the material to be milled (ease of grinding, particle size, etc.) should also be considered.

In order to effectively crush the material, the following principles must be followed when determining the grading:

First of all, the steel ball must have a large enough impact force so that the steel ball of the ball mill has enough energy to crush the granular material, which is directly related to the maximum diameter of the steel ball.

Secondly, the steel ball should have enough impact times on the material, which is related to the filling rate of the steel ball and the average ball diameter. When the filling amount is constant, on the premise of ensuring sufficient impact force, the diameter of the grinding body should be reduced as much as possible, and the number of steel balls should be increased to increase the number of impacts on the material, so as to improve the crushing efficiency.

Finally, the material has enough residence time in the mill to ensure that the material is fully crushed, which requires the steel balls to have a certain ability to control the flow rate of the material.

3. The so-called two-stage ball distribution method is to use steel balls of two different sizes and with a large difference in diameter for grading. The theoretical basis is that the gaps between large balls are filled by small balls to fully increase the packing density of steel balls. In this way, on the one hand, the impact capacity and number of impacts of the mill can be improved, which is in line with the functional characteristics of the grinding body; on the other hand, the higher bulk density can make the material obtain a certain grinding effect. In the two-stage ball distribution, the function of the large ball is mainly to impact and break the material, and the function of the small ball is to fill the gap between the large balls and increase the packing density of the grinding body, so as to control the flow rate of the material and increase the grinding capacity; It plays the role of energy transfer and transfers the impact energy of the big ball to the material; the third is to squeeze out the coarse particle material in the gap and place it in the impact area of the big ball.