What if the ball mill liner wears too fast?

What if the ball mill liner wears too fast?

The ball mill is the key equipment for crushing the material after it has been crushed. The lining plate is an important part of the ball mill. It not only can effectively protect the barrel of the ball mill, but also increase the impact and friction between the medium and the material to improve the milling efficiency. However, under the long-term operation of the grinding mill lining, the lining wear is too fast. This article talks to you about the reasons why the ball mill liner wears too fast and how to deal with it.

1. The wear of the ball mill liner and the steel ball

Cause Analysis:

The ball mill liner and the steel ball are both wearing parts. During the grinding process, the ball mill ball and the material are thrown in the cylinder to make a drop motion. At this time, the ball mill liner and the steel ball and the material will collide with each other. Produce friction. In continuous operation, the harder the material, the faster the wear rate of the ball mill liner and the steel ball, which may cause equipment damage or even cause safety accidents. The size of the steel ball and the number of steel balls will affect the service life of the ball mill liner. If the ball mill is in operation, increasing the steel ball volume or filling the steel ball with a larger diameter will increase the wear of the ball mill liner.

Responses:

Reasonable selection of ball mill liners and steel balls is one of the main ways to reduce the wear of the liner too fast.

  • (1) The relevant staff needs to know the ratio of the ball mill liner to the steel ball, and select the corresponding steel ball size and quantity according to the ratio. In general, the hardness ratio of the liner of the conventional ball mill to the steel ball is about 1:0.8.
  • (2) It is necessary to control the ratio of material to steel ball, and the material is twice as best as steel ball.
  • (3) When selecting the ball mill, choose the appropriate ball mill liner according to the mineral type, control the hardness of the ball mill liner and the steel ball, and make a reasonable match between the steel ball and the liner.
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2. The material of the ball mill liner is unreasonable

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Cause Analysis:

The material of the ball mill lining and its heat treatment process are the key to determine the mechanical properties of the lining. If the lining material is improperly selected, it will greatly reduce its fatigue strength and life, not only can not meet the requirements of the ball mill, and even plastic deformation or drum.

Responses:

The new wear-resistant lining material is selected. The commonly used ball mill lining materials are high manganese steel, high chrome steel, alloy steel and wear resistant rubber. Among them, wear-resistant rubber is a lining material emerging in recent years. It can be made of wear-resistant rubber and alloy steel to form a composite liner, which not only improves the toughness of the liner but also solves the contradiction between toughness and rigidity.

3. The ball mill liner heat treatment process is unreasonable

Cause Analysis:

The heat treatment process of the ball mill liner is unreasonable, which not only increases the wear phenomenon of the liner, but also affects the strength of the liner, causing the ball mill bolt to break under the action of large shear force. In the actual operation, the staff lacks the understanding of the material of the liner, and the heat treatment of the ball mill liner is insufficient. Therefore, the strengthening effect of the ball mill liner is not in place, the strength is low, and the plastic deformation often occurs when the steel ball and the material are impacted. phenomenon.

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Responses:

According to the material of the lining plate, the suitable heat treatment process can be selected to effectively reduce the wear of the ball mill lining.

4. The ball mill is not working properly

Cause Analysis:

When the ball mill is in an abnormal operating state, it will also have an adverse effect on the ball mill liner. When the ball mill is in normal operation, the steel ball is mixed with the material. When the steel ball is thrown to the lining plate, a barrier is formed between the steel ball and the material to play a buffering role, and the material is gradually ground. If the ball mill is running at low load, the steel ball will directly impact the lining, causing severe wear and even breakage of the ball mill lining.

Responses:

The relevant staff needs to know the running state of the ball mill and control the running state of the ball mill. When the ball mill is running under low load condition, it is necessary to adjust the feeding amount of the ball mill in time to ensure the grindability of the material.