A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering. It works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell. How to improve the working efficiency of ball mill? The technical staff from Henan Baichy Machinery will tell you the answers.
1. Control the feeding granularity
Control the feeding material size between 15-25mm(The diameter of the ball mill is different for different feeding material size ). too fine material will cause that there are too many fine feeding material to reach the friction between material and material during the grinding process. Too coarse feeding material will cause a longer time for the steel ball to crush the material,and it will also increase the wear of the steel ball and the liner board and increase the maintenance cost of the mill.
2. Uniform feeding
The feeding methods of ball mill is also very important, to achieve uniform feeding, too less feeding will cause that there is no material layer, which will result in the steel ball impact with each other, it will also cause a waste of power resources. Too much feeding will reduce the motion efficiency of the steel ball, which will cause the Qualified material cannot be discharged, the output is reduced accordingly. Therefore, the material should be evenly fed during the feeding process.
3. Improve the material of the lining board and increase the effective volume of the cylinder
Increase the effective volume of the ball mill can improve the mill efficiency. Large thickness and weight of the ordinary alloy liner board will reduce the effective volume of the mill and increase the power consumption, which will reduce the production efficiency of the ball mill. So the material of the liner board is very important, ZGMn13 (high manganese steel ) liner board with reasonable thickness is the right choice, it is wear resistance, surface hardness up to HV500, equivalent to about HRC45, this can increase the wear resistance of the liner board and can also increase the effective volume of the cylinder, so as to improve the working efficiency of the ball mill.
4. Control filling rate and mill speed
The processing capacity of the ball mill increases with the increase of the filling rate of the ball. Increasing the filling rate increases the probability of the crushing ore of the steel ball and the self grinding of the ore.The filling rate of the wet grid type ball mill is generally 40-50%,The filling rate of the overflow ball mill is generally 35-40%, The filling rate of the dry grid type ball mill is generally 25-35%.
5. Choose the right ball matching ratio
The diameter of the ball is different with different grinding conditions, The diameter of steel ball is generally divided into 120, 100, 80, 60, 40mm, etc.If there are many large pieces of material in the mill, the ratio of large diameter should be more when selecting steel balls. If there are many small materials in the mill, small diameter should be more when selecting steel balls. Because the large diameter steel ball is mainly for crushing material, the small diameter steel ball is mainly for fine grinding the material.
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