When installed, the magnetic liners are directly attached onto the inner wall of ball mill with no bolts. When the ball mill operates, the magnetic liners attract the broken balls and magnetic mineral onto the surface to form a certain thickness of protection layer to prevent the tumbling media and fine ore from directly contacting the liners, which lengthening the service life of the liners. It is widely used for all kinds of minerals with strong, medium and weak magnetism. If it is used for non-magnetic materials, certain quantity of ferromagnetic substances such as broken steel balls and iron scrap must be added regularly so as to form a protective layer. Advantages: 1. Long service life, light weight, thin thickness, low ball and power consumption. 2. Attached on the inner wall of cylinder by magnetic force, no pulp leakage and highly efficient. 3. Easily installed and need less labor work, fast replacement and maintenance. 4. Widely used for high, medium, and weak magnetic mineral. 5. Can be used for nonmagnetic mineral substance, but certain quantity of ferromagnetic substances such as broken steel balls and scrap iron must be added form protection layer.