How to control the wear of grinding media during the grinding process of basket mill?

1. Choose the right grinding media material
Select grinding media according to the hardness of the material and the grinding requirements. If the hardness of the material is low, you can choose grinding media with slightly lower hardness but better wear resistance, such as high-quality glass beads. Although the hardness of glass beads is lower than that of zirconia beads, the wear caused by them is relatively small for soft materials and can meet the grinding requirements. For materials with higher hardness, such as ores or ceramic raw materials, grinding media with high hardness and strong wear resistance, such as zirconia beads, should be selected. Zirconia beads have good wear resistance and can reduce their own wear when grinding hard materials.
2. Optimize the size and filling rate of grinding media
Size control: The size of the grinding media should match the particle size of the material and the working parameters of the basket mill. Oversized grinding media have a large mass and inertia during the grinding process, and the impact force when colliding with each other and the basket is strong, which is easy to cause wear. Oversized grinding media may increase the friction frequency with other parts due to excessive movement in the basket. Generally speaking, try to choose a moderate size of grinding media while meeting the grinding effect. For example, for materials with smaller particle sizes, do not overuse large-sized grinding beads for grinding.
Filling rate adjustment: A suitable grinding media filling rate can reduce wear. If the filling rate is too high, the collisions between the grinding media and the basket will be too frequent, which will accelerate wear; if the filling rate is too low, the grinding media will have too much space to move in the basket, the movement trajectory will be unstable, and the friction with the basket wall may also increase. Generally, it is more appropriate to keep the grinding media filling rate at 50% - 70% of the basket volume. Within this range, fine-tuning can be made according to the properties of the material and the grinding requirements.
3. Reasonable control of equipment operating parameters
Speed ​​control: The speed of the basket mill has a significant effect on the wear of the grinding media. If the speed is too high, the centrifugal force obtained by the grinding media is too large, and its movement speed is fast, and the collision and friction intensity between each other and the basket wall increases, resulting in increased wear. Therefore, a suitable speed should be determined based on the hardness of the material, the characteristics of the grinding media and the grinding requirements. For example, for materials with lower hardness and softer grinding media, appropriately reducing the speed can effectively reduce wear while ensuring a certain grinding efficiency.
Grinding time control: Too long grinding time will cause the grinding media to be in a state of collision and friction for a long time, thereby increasing wear. The appropriate grinding time should be determined through experiments, and grinding should be stopped in time after the target grinding fineness is reached. The particle size of the material can be regularly detected using a particle size analyzer. When the material reaches the target particle size range, the grinding process is ended to avoid unnecessary wear.
4. Ensure the quality and pretreatment of materials
Material quality control: If the material contains impurities, especially impurities with higher hardness (such as metal particles, sand particles, etc.), it will aggravate the wear of the grinding media during the grinding process. Therefore, the material should be strictly screened and filtered before feeding to remove these impurities. For example, when grinding pigments, ensure that no foreign matter such as metal chips is mixed into the pigment raw materials.
Material pretreatment: For some materials with strong agglomeration, pre-dispersion treatment can make the material better contact with the grinding medium during the grinding process, avoiding the grinding medium from being worn due to excessive local force. For example, for nanomaterials that are easy to agglomerate, they can be pretreated by ultrasonic dispersion and other methods before grinding.
5. Regularly inspect and maintain equipment
Check the state of grinding media: Regularly inspect the wear of grinding media, and judge the degree of wear by observing the appearance of grinding media (such as whether there is any breakage, degree of surface wear, etc.) and measuring its size change. For grinding media with severe wear, replace them in time to ensure the grinding effect and reduce the additional wear of other grinding media. For example, when it is found that the diameter of the grinding beads is worn by more than 10% - 20% of the original diameter (the specific value is determined according to the actual situation), replacement should be considered.
Inspection and maintenance of equipment components: Check whether the inner wall of the basket is smooth. If there is wear or unevenness, it will affect the movement trajectory of the grinding medium and increase wear. Perform regular maintenance on the basket, such as repairing worn parts or replacing the basket. At the same time, check the operation of the drive device (such as motor, transmission parts, etc.) to ensure smooth operation of the equipment and reduce the wear of the grinding media caused by equipment vibration and other reasons.