The Factors of Ball Mill Liners Failure

The ball mill which is also has the advantages of large crushing ratio, simple structure, stable performance and high production efficiency takes the ball as the grinding medium to carry on the grinding to the material and is the main grinding equipment in industrial production. It is widely used in the mining, metallurgy, thermal power and other industries, with the expansion of the scale of mining, the large size of the ball mill has become the trend of development. Ball mill liners is installed inside the ball mill, which has the function of protecting the cylinder and adjusting the moving track of the medium.

In the process of grinding, the ball mill liners are subjected to great impact load, and its own wear is serious, the fracture and wear failure often occur, which seriously affects the production efficiency of the ball mill. Therefore, the liners structure and performance directly influence the production capacity and economic performance of the ball mill.
There are many factors that affect the failure of ball mill liners, which can be divided into the following types.
1 Matching problem of liners and medium
The process of interaction between the media and the liners is a process of mutual friction. The study shows that the wear resistance is proportional to the hardness of the material in a pair of friction pairs, and the difference between the hardness and the wear rate is consistent. Therefore, the hardness of the medium and the liners hardness need to be matched with each other to reduce the wear of the medium and the liners, thereby saving the cost and improving the economic efficiency. In addition, the large medium size can lead to the impact force of the liners and increase the wear of the liners, so the medium size should also be matched with the liners.
2 Liner material and quality problems
Liner materials should be selected based on the physical properties of the media materials, structure size and the characteristics of the liner grinding, etc. High manganese steel liner material is common and low hardness after heat treatment, but prone to fracture or plastic deformation. Therefore, in terms of material selection, in addition to pay attention to the toughness of the material, you should also consider how to eliminate plate internal about the result of casting defects.
3 Liners design and installation problems
In order to reduce the consumption and improve the service life of the ball mill liners, the design and installation of the lining board need to be reasonably planned. The square bolt hole will lead to the phenomenon of stress concentration in the liners; So in order to guarantee the safe operation of the ball mill, unfavorable factors should be reduced or avoided by ball mill liners design or installation. Rationally adjust the liners structure dimensions and control the liners clearance, After the installation prevent the loosening of bolts and other issues by adjustment.