27 Mar,2020 UTC+8 Views:
When we buy a ball mill, the manufacturer's manual will have detailed technical parameters, and generally will give a range of output values. Normally, the output will remain normal when the ball mill is just put into production, but after a period of operation, there may be a situation where the output becomes lower. So what is the reason for the lower and lower output of the ball mill?
1. "Full grinding" of ball mill
When the output of the ball mill is getting lower and lower, the first thing to consider is whether there is "full grinding", which is the culprit that affects the output of the ball mill.
The causes of "full grinding" are: too much feed; the hardness of the material entering the grinding becomes harder and the particle size becomes larger; the moisture of the material entering the grinding is too large; the gradation of the steel ball is unreasonable; Clogged.
The solution to the problem of "full grinding": reduce the amount of feed; when the size or hardness of the incoming material changes, make appropriate adjustments in time; adjust the moisture of the incoming material; rationally configure the ratio of large, medium and small steel balls; clean up Blockage of partition board or caster joint; increase the ventilation of the ball mill barrel.
2. The working time of the ball mill is too long
The length of the ball mill directly affects the product composition and purity, and the effect of the ball mill time on the particle size is also obvious. In the initial stage, with the extension of time, the particle size declines rapidly, but after a certain period of ball milling, even if the ball milling time continues to be extended, the size of the product particle size value decline is not too large. Different samples have different optimal ball milling times. On the other hand, the longer the ball milling time, the more serious the pollution, which affects the purity of the product.
3. Failure to add steel balls in time
The quality of the ball mill's ore grinding performance and the level of production are restricted by the ball of the ball mill, but with the grinding and impact of the barrel, the steel ball will wear out, so the steel ball must be replenished in time to ensure the maximum output of the ball mill. Consistency.
4. The temperature in the cylinder increases
When the temperature of the ball mill is increased during operation, the effective strain of the nano-material formed by the ball mill is reduced, and the grain size is increased, which significantly affects the mechanical properties of the powder-made block. Moreover, regardless of whether the final product of the ball mill is a solid solution, an intermetallic compound, a nanocrystal, or an amorphous phase, the diffusion problem is involved, and the diffusion is affected by the grinding temperature, so the temperature is also an important factor affecting the output of the ball mill.
5. The moisture content of the material is too high
Due to the large moisture content of the material, the uniformity of the feed is affected and the feeding time is extended. Secondly, due to the excessive feeding of wet materials, it may cause the phenomenon of grinding the paste ball and paste liner, and even "full grinding" occurs and the grinding process is forced to stop. Generally speaking, for every 1% increase in the integrated moisture content of the grinding material, the output of the ball mill will be reduced by 8% -10%; when the moisture content is greater than 5%, the ball mill is basically unable to perform the grinding operation.
6. The proportion of grinding aid added is unreasonable
The national standard stipulates: grinding aids are allowed to be added in the cement production process, but the addition amount should not exceed 1%. The addition beyond this standard is 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.
If your ball mill's output is getting lower and lower, you can check in sequence according to the above reasons, find the crux of the problem, completely solve the problem of low output from the root cause, and resume production as soon as possible.