Ball Mill Liner Wear Solution

Ball Mill Liner Wear Solution

Ball mill liner wearing too fast, maintenance costs soar? There are three reasons and corresponding solutions. Ball mills are widely used in building materials, mining, metallurgy and other industries. Lining is an important part of a ball mill. In the operation of ball mill, it is easy to cause lining wear and damage, which affects the service life of ball mill. The wear reason of bushing of ball mill is analyzed, and the corresponding solution is put forward. I hope it will help you.

Wear analysis of bushing of ball mill

1. Wear between the liner and the ball

The working principle of the ball mill is to use the rotation of the cylinder, and according to the actual needs of operation, lift the steel ball to a certain height, and then fall down with parabola, impact the material in the cylinder, so that the material and lining are completely friction. Therefore, in the continuous work, the steel ball and the liner will produce the serious wear phenomenon, which is directly related to the hardness of the material.

In addition, the wear phenomenon of lining is also related to the wear resistance of steel ball. During ball sliding, friction between bush and ball increases, and friction increases with ball hardness. Adding it would not only lead to lining damage, but also to safety accidents, resulting in equipment damage and even worker safety.

At the same time, lining wear is also directly related to the number of steel ball. The more the steel balls in the ball mill, the more the lining wear, so it is necessary to pay attention to the dialectic relationship between the number of steel balls and working efficiency. Otherwise, it will lead to lining rupture, which will affect the continuity of milling work.

In addition, in practical application, it is found that the size of the steel ball and the height of lift will also have different effects on the pad. The larger the diameter of the steel ball, the higher the height of the lifting ball, the greater the initial speed, the greater the impact force generated by the rolling of the steel ball, and the greater the wear caused by the large steel ball. A small ball of steel.

The relevant workers need to properly coordinate the number and size of the steel ball, balance the relationship between efficiency and safety, and avoid lining cracking and mud 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.

Workers also need to control the hardness of lining materials and rigid balls. These two aspects need to comply with regulations and match properly with the steel ball and lining. For example, if the steel ball has a hardness of HRC37, then the lining should have a hardness of HRC43, which depends on the lining material and hardness, so choose the lining heat treatment process reasonably.

Use New Material Liners

With the development of technology, new material lining also began to be used in ball mills. For example, a composite lining made of rubber and hard alloy steel is an ideal solution to the conflict between the toughness and stiffness of the lining and to reduce the lining. Impact force during operation. Compared with common liner, the heat resistance and strength of composite liner are greatly improved, especially in service life. In addition, composite lining noise low, light weight, easy to promote, but lack of practice, but with broad market prospects. It has a lot of room for development in dealing with lining aging and liner wear.

3. Control the running state of the ball mill

Controlling the running state of ball mill is also an important measure to deal with liner wear. When the ball mill is running under low load, the flow amount of ball mill must be adjusted in time to improve the wearability coefficient of the mine.

In the lining installation, mismatched components must be excavated so that the lining is fully integrated into the ball mill's operating system. After the lining plate is installed, the related personnel must make repeated debugging and make detailed records to ensure that the internal fixation bolts of the ball mill have certain pre-tightening force and prevent the bolts from loose and grinding during the ball operation.

In addition, the liner needs to be replaced in time. Generally speaking, as long as the operation is normal, it takes 12 months to replace the lining board, do a full inspection and actively adjust the position of the lining board according to the actual situation, which can reduce the loss of the lining board to some extent.

To sum up, in order to solve the problems of lining wear of ball mill, it is necessary to analyze the causes of lining wear and put forward corresponding measures. For example, choose the ball and lining properly, control the operation of the ball mill, use new material lining and so on, so as to reduce unnecessary loss during operation.

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