Why is the output of ball mill grinding not up to standard
Ball mill grinding output is not up to the standard reason
It is a very common problem that the output of ball mill can not meet the design requirement. Under what circumstances will the output of ball mill fail to reach the standard?
1 unreasonable design of the length of each warehouse of the ball mill
The improper length ratio of each storehouse of the ball mill results in the imbalance of the coarse and fine grinding ability of the ball mill, which leads to the phenomenon that the product is too large or too fine, and then affects the output.
2. Poor ventilation of the ball mill
In the normal operation of the ball mill, due to the repeated impact and friction of the medium in the cylinder, the temperature in the mill increases continuously, resulting in the water vapor produced by the water-bearing material. If the ventilation effect of the ball mill is not good, and the water vapor cannot be discharged in time, the water vapor will stick to the lining plate and steel ball of the ball mill, causing the phenomenon of ball paste or paste grinding.
Therefore, it is necessary to control the ventilation volume of the ball mill. The good ventilation effect in the ball mill can not only bring out qualified fine materials in time, but also effectively reduce the phenomenon of over-grinding and reduce the temperature of the ball mill
3. Unreasonable feeding of ball mill
In the running process of the ball mill, uniform feeding is a necessary condition to ensure the normal operation of the mill.If the ball mill to feed too much, will cause the ball mill grinding capacity is insufficient, leading to saturation phenomenon, so need to strictly in accordance with the feeding standard for feeding.
4. The grinding size of ball mill is too large
The grinding particle size of the ball mill is too large, and the impact and effect of the grinding body is difficult to adapt to, and the first chamber of the ball mill will be broken to increase the amount of steel balls, in order to enhance the impact and grinding ability, this situation is easy to cause unreasonable crushing in one chamber.
Generally, the particle size of the ball mill is controlled at 15mm. For large ball mills, the particle size can be adjusted to 25~30mm due to the strong crushing capacity.
5, Too much water in the ball mill
When the water content of the grinding material into the ball mill is large, the grinding body and the lining plate will adhere to each other, causing paste grinding, blocking the grate plate and causing full grinding.However, a small amount of water can effectively reduce the temperature of the ball mill, reduce static electricity, etc., therefore, the average water into the grinding of the ball mill is generally controlled in <15% is appropriate.
6, ball mill steel ball grade unreasonable
Ball mill steel ball grading is to achieve the impact of different particle size materials and grinding, in order to improve the grinding efficiency, so the ball mill steel ball grading is very important, the general range of grading in 25% to 35%, but the actual application of intermediate distribution in 28% to 32%.
Note: the filling rate of one bin should be >28% when the material's easy to grind performance is poor or the grinding requirement is fine.
7. The temperature of the ball mill material is too high
General grinding material into the mill at high temperature, easy to reduce the milling efficiency, when the temperature of the ball mill is more than 100 ℃, the material of the isolation layer of air between small particles surface membrane will be destroyed, cause adhesion phenomenon.To reduce the temperature inside mill, improve the efficiency of grinding, grinding to powder into a small amount of fog water in the warehouse, the mill within the temperature dropped below 50 ℃.
8. Unreasonable grinding agent
A small amount of grinding AIDS can be added on the premise that the grinding performance of the ball mill is not damaged. It can not only accelerate the crack growth in the material grinding, reduce the bond between fine powder, effectively improve the grinding efficiency, but also improve the efficiency under the energy saving of the ball mill.
However, grinding AIDS for ball mills shall be added in accordance with the national standards. Generally, the amount of grinding AIDS shall not exceed 1% in the process of cement production. For other materials, the proportion of grinding AIDS can be inquired through the national standards.
The above are the common problems that cause the output of ball mill is not up to the standard. In addition, there are many other reasons for the low output of ball mill. One of the ways to improve the output of ball mill is to find and solve the problems timely.In addition, strictly in accordance with the design requirements of the ball mill to complete the work and the ball mill daily maintenance is also an effective way to ensure the grinding output of the ball mill.
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