Home News What is the reason for the lower and lower output of ball mills?

What is the reason for the lower and lower output of ball mills?

2021-09-14 08:22 Author:Lynn

When the ball mill is just put into production, the output will remain normal, but after a period of operation, the output may become lower. Then what is the reason for the lower and lower output of the ball mill? I believe you can get the answer by reading this article.

800 tons graphite ball mill in Vietnam

Reasons for the lower and lower output of ball mills:

1. “Full grinding” is the chief culprit affecting the output of ball mills

When the output of your ball mill is getting lower and lower, you should first consider whether there is “full grinding”, which is the culprit that affects the output of the ball mill.

The reasons for “full grinding” are: too much feed; the hardness of the grinding material becomes harder and the particle size becomes larger; the water content of the grinding material is too large; the steel ball grading is unreasonable; Blockage.

The solution to the “full grinding” problem: reduce the amount of feed; when the size or hardness of the grinding material changes, make corresponding adjustments in time; adjust the water content of the grinding material; reasonably configure the ratio of large, medium and small steel balls; clean up Blockage of the partition board or grate seam; increase the ventilation of the ball mill cylinder.

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2. The working time of the ball mill is too long

The length of the ball milling time directly affects the product composition and purity, and the ball milling time also has a significant effect on the particle size. In the initial stage, with the extension of time, the particle size decreases briskly, but after the ball milling for a certain period of time, even if the ball milling time continues to be extended, the particle size value of the product does not decrease too much. Different samples have different better ball milling times. On the other hand, the longer the milling time, the more serious the pollution will be, which will affect the purity of the product.

Boussova Iron Ore Ball Mill

3. Failure to add steel balls in time

The grinding effect of the ball mill and the level of output are restricted by the steel balls of the ball mill, but with the grinding and impact in the cylinder, the steel balls will wear out, so it is necessary to add steel balls in time to ensure the ball mill to a greater extent. Consistency of output. For the question of ball mill steel ball grading, please refer to the article: How to correctly add steel balls when the ball mill is activated.

4. The temperature in the cylinder rises

When the ball mill is in operation, the temperature rises, the effective strain of the ball mill to form nanomaterials is reduced, and the crystal grain size increases, which significantly affects the mechanical properties of the powder made into bulk materials. Moreover, whether the product of ball milling is solid solution, intermetallic compound, nanocrystal, or amorphous phase, diffusion is involved, and diffusion is affected by the grinding temperature, so temperature is also an important factor affecting the output of the ball mill.

5. The material moisture content is too high

Due to the large moisture content of the material, the uniformity of the feeding is affected and the feeding time is prolonged. Secondly, because the wet material is fed too much, it may cause the phenomenon of paste ball and paste liner in the mill, and even “full grinding” will be forced to stop the grinding process. Generally speaking, for every 1% increase in the comprehensive moisture of the material entering the mill, the output of the ball mill will decrease by 8%-10%; when the moisture is greater than 5%, the ball mill basically cannot perform grinding operations.

6. Addition ratio of grinding aid

The national standard stipulates that grinding aids are allowed to be added in the cement production process, but the mixing amount shall not exceed 1%. Additions exceeding this standard are unreasonable. In addition, most grinding aids are substances with strong surface activity and are not suitable All materials should be added reasonably according to the nature of the materials.

To sum up, if the output of your ball mill is getting lower and lower, first check whether the “full grinding” phenomenon occurs. If not, then check in order according to the several reasons listed below for you to find the crux of the problem. Solve the problem of low output completely from the root cause, so that your ball mill can resume production as soon as possible, and bring you greater economic benefits.