The working principle of ball mill magnetic liner: 1, Embedded magnetic material in the alloy castings to form liner; 2, Magnetic liner absorb in the cylinder wall by magnetic; 3, Adsorb broken ball on the liner wall by magnetism, forming a protective layer; 4, Through the protective layer to protect magnetic lining, making it durable. Performance advantages of magnetic ball mill liner: Compared with the traditional manganese steel liner, it is long life, light weight, thin thickness, provincial ball, energy saving, low noise, the operating rate, and do not bolt, easy installation, no leakage pulp, good working environment, greatly reducing the labor intensity, less accidents, less spare parts consumption. According to the production practice verification, use magnetic lining board in big ball mill, its life than manganese steel lining board to extend the 4 to 6 times, it has very remarkable comprehensive benefit, is the favorable measures metallurgical mining efficiency and reducing consumption, loved by customers.