Ball Mill

[Introduction]: Ball mill is an industrial equipment widely used in mining, building materials, and chemical industries. It is primarily used for crushing and grinding solid materials to achieve the desired particle size. Its basic structure is a horizontally placed, rotatable cylindrical body containing grinding media (such as steel balls, ceramic balls, etc.) and the material to be ground. Through the rotation of the cylinder, the impact and friction between the media and the material achieve fine crushing, making it a key piece of equipment in the material preparation process. Generally, the feed particle size of the ball mill is required to be less than 25mm, emphasizing crushing over grinding to save energy. The fineness and quantity of the output material are changed by adjusting the gradation of the steel balls. Our company’s high-efficiency, energy-saving ball mills all use rolling bearings instead of sliding bearings. Compared to sliding bearings, this results in 10-20% energy savings. Under the same power conditions, production capacity is increased by 10-20%. Depending on the material and discharge method, dry grate ball mills, wet grate ball mills, or wet overflow ball mills can be selected. According to the liner type, they are divided into the A series (high manganese steel liner, magnetic liner) standard type and the B series (rubber liner, high alumina liner, silica liner) energy-saving type; according to the transmission method, they are divided into edge-drive ball mills and center-drive ball mills. According to the number of chambers, they can be divided into single-chamber, two-chamber, and multi-chamber systems. According to the process operation, they can also be divided into open-circuit and closed-circuit (with grading equipment) systems.

[Working Principle]: The working principle of a ball mill is based on the action of centrifugal force and friction. When the cylinder is driven to rotate by the transmission device, the grinding media and materials inside are lifted to a certain height under the action of friction. When the lifting angle exceeds its natural angle of repose, the grinding media will fall or cascade down like a waterfall. During the falling process, the media exert a strong impact on the material, breaking it up; at the same time, during the rolling and sliding of the cylinder, grinding and friction will also occur between the media and the material, and between the material itself, thereby further grinding the material. Finally, the material is discharged through the unloading device, the product that reaches the required particle size is collected, while the coarse particles that do not meet the requirements continue to be ground inside the machine.