Ball Mill Liner Wear Solution

Ball Mill Liner Wear Solution

Ball mill liner wear too fast, maintenance costs soared? There are three reasons and corresponding solutions. Ball mills are widely used in building materials, mining, metallurgy, and other industries. Linings are an important part of ball mills. In the operation of the ball mill, it is very easy to cause the wear and damage of the liner, thereby affecting the service life of the ball mill. This paper analyzes the cause of wear of the ball mill liner and proposes corresponding solutions. Hopefully it will help you.

Analysis of Wear of Ball Mill Liner

1. Wear between liner and ball

The working principle of the ball mill is to use the rotation of the cylinder, and according to the actual needs of the operation, the steel ball is lifted to a certain height and then dropped by a parabola to impact the material in the cylinder, so that the material and the liner are fully frictioned. Therefore, in the continuous work, the steel ball and the liner will have serious wear phenomenon, which is directly related to the hardness of the material.

In addition, the wear phenomenon of the liner is also related to the abrasion resistance of the steel ball. During the sliding of the steel ball, the friction between the liner and the steel ball increases, and the friction increases with the hardness of the steel ball. Increasing it will not only result in damage to the liner, but also cause a safety accident, resulting in equipment damage and even life safety of the workers.

At the same time, the wear condition of the liner is also directly related to the number of steel balls. The more steel balls in the ball mill, the higher the degree of wear of the liner, so the dialectical relationship between the number of steel balls and the operating efficiency needs to be taken care of. Otherwise it will cause the liner to break, affecting the continuity of the milling work.

Ball Mill Liner Wear Solution Ball Mill Liner Wear Solution

In addition, in practical applications, it is found that the size of the steel ball and the height of the lift will also have a different effect on the liner. The larger the diameter of the steel ball, the greater the height of the lifted ball, the greater the initial velocity, and the steel ball The greater the impact force generated by the tumbling, the greater the wear caused by the larger steel balls than the smaller diameter steel balls.

Relevant workers need to properly coordinate the number and size of steel balls, balance the relationship between efficiency and safety, and avoid lining cracking and slurry leakage.

2. The lining material and heat treatment process are unreasonable

Liner material and heat treatment process directly determine the mechanical properties of the liner, will have a significant impact on the wear of the liner; if the liner material is not properly selected, heat treatment process is not reasonable, will significantly reduce the liner fatigue strength and use Lifetime, it can not meet the requirements of ball mill grinding operations, and even plastic deformation from the drum and other issues.

Heat treatment of the lining plate is an important way to reduce the wear of the lining plate of the ball mill. Therefore, a suitable heat treatment process should be selected according to the material of the lining plate. However, in actual work, the relevant staff lacked understanding of the material of the lining plate. Therefore, in the heat treatment work, the insufficient processing of the lining plate not only did not play a reinforcing role, but also made the strength of the lining plate lower. When the ball, material impact, there will be plastic deformation phenomenon.

The unreasonable heat treatment process will also affect the yield strength of the liner and cause the ball mill bolt to break under the action of the huge shear force.

3. Effect of ball mill operation

Once the ball mill is in an abnormal operating state, it will also adversely affect the use of the liner. In general, the ball and material in the ball mill are mixed together. Therefore, when the steel ball is hit in the parabolic state, the material will play a certain buffering effect and gradually grind the material.

When the equipment is running at low load, the steel ball will directly impact the liner, causing serious wear of the liner and even fracture. Relevant workers should pay attention to this issue and ensure the normal operation of the ball mill.

Ball mill liner wear and tear measures

1. Reasonable choice of steel balls and linings

Reasonable choice of steel ball and liner is an important way to reduce the wear of the liner. Therefore, the relevant staff needs to start with the size and quantity of the ball, the hardness ratio between the ball mill liner and the steel ball, and fundamentally reduce the loss of the liner during the operation of the ball mill.

In general, the hardness ratio of the ball mill lining plate to the steel ball is controlled to be about 1:0.8. Secondly, it is necessary to control the ratio of slag and ball in the ball mill. In general, the slag is about twice as much as the ball, once Disproportionately, it is easy to cause the ball mill to run at a low load, which causes the steel ball to directly impact the liner and cause the liner to break.

Relevant workers also need to control the hardness of the lining material and the rigid ball. These two aspects need to be in accordance with regulations, and do a reasonable match with the steel ball and the lining. For example, if the hardness of the steel ball is HRC37, then the liner The hardness should be HRC43, depending on the material and hardness of the liner, a reasonable selection of liner heat treatment process.

2. Using new material liner

With the advancement of technology, new material liners have also begun to be used in ball mills. For example, composite liners made of rubber and hard alloy steel are ideal solutions to the conflict between the toughness and stiffness of the liner and reduce the liner. Impact force during operation. Compared with common liners, the heat resistance and strength of composite liners have been greatly improved, especially in terms of service life, composite liners double the role of traditional liners, greatly improving the economic efficiency of the company. In addition, the composite liner has low noise, light weight, and is easy to promote, but it lacks practice, but it has broad market prospects. It has great room for development in terms of dealing with aging of liners and wear of liners.

3. Control the running status of the ball mill

Controlling the running status of the ball mill is also an important measure to deal with the wear of the liner. When the ball mill is running at a low load, it is necessary to adjust the influx of the ball mill in time to increase the grindability coefficient of the mine.

In the installation of the lining board, it is necessary to dig out the unmatched parts so that the lining board is fully integrated into the working system of the ball mill. After the lining board is installed, the relevant staff must carry out repeated debugging and carry out detailed Record to ensure that the internal fixation bolts of the ball mill have a certain pre-tightening force to prevent the bolts from loosening during the operation of the ball mill.

In addition, timely replacement of the liner is also required. In general, as long as the operation is proper, it takes 12 months to replace the lining board, do a sufficient inspection work, and actively adjust the position of the lining board according to the actual situation, to a certain extent, can reduce the loss of the lining board.

To sum up, in order to deal with problems such as wear of ball mill linings, it is necessary to analyze the causes of lining wear and propose corresponding measures. For example, reasonable selection of balls and linings, control of the operation of the ball mill, use of new material linings, etc., thereby reducing unnecessary losses during operation. Welcome message to communicate your problems.

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