Ball mill is a traditional material grinding device with a history of more than 100 years. Ball mill is the main equipment for processing solid materials into grinding. It is widely used in mineral processing, metallurgy, chemical industry, cement, ceramics, construction, electricity, pharmaceuticals, defense industry and other departments. Dry or wet grinding of various ores and other grindable materials.

　　Types of ball mills

　　Commonly used ball mills for mineral processing are mainly grid type and overflow type: Application of grid type ball mill: The grid type belongs to forced discharge, the grinding time of the material in the ball mill barrel is relatively short, and the discharge particle size is relatively coarse, generally 0.2-0.3mm, which is more suitable for one-stage grinding operation. Application of overflow ball mill: The overflow discharge method is passive, the grinding time of the material in the barrel is relatively long, and it is easy to produce over-grinding phenomenon. The discharge particle size is relatively fine, generally less than 0.2. mm, suitable for fine-grained grinding, often used in the concentrate re-grinding stage.

　　Principle of ball mill

　　The working principle of ball mill is that the material enters the cylinder of ball mill through the hollow shaft diameter, and the cylinder of ball mill is driven by motor. Under the action of cylinder rotating at a certain speed, the material in the cylinder and the medium move, including gravity, centrifugal force and friction. When the grinding medium reaches a certain height with the cylinder, when the deadweight is *er than the centrifugal force, it will be thrown down or rolled down from the inner wall of the cylinder. Because the gravitational potential energy is converted into kinetic energy when falling, the steel ball will eventually collide with the ore at a certain terminal speed. The running track of ball mill is related to its running speed. The running speed can be divided into three operating modes: high speed, normal speed and low speed. Its states are centrifugal, throwing and shedding.