Ball Mill Working Principle

Ball Mill Working Principle:

The main working part of a ball mill is a rotating drum that is horizontally mounted on two large bearings. The drum is divided into several chambers by partition plates, each containing a certain shape and size of grinding media. The grinding media are typically steel balls, steel ingots.

Steel rods, cobblestones, gravels, and porcelain balls, etc. To prevent the cylinder from wearing, a lining is installed on the inner wall of the cylinder.

As the ball mill rotates, the grinding media adhere to the inner wall lining surface under the action of centrifugal force and friction with the inner wall lining surface of the cylinder, rotating with the cylinder and being brought to a certain height (as shown in Figure 1), where they are subjected to gravity

Under the force, the grinding media fall freely, and during their descent, they act like projectiles, impacting the bottom material and breaking it apart. The cycle of the grinding media rising and falling is continuous. Moreover, during the rotation of the mill, the grinding media also generate sliding effects.

Motion and rolling cause the grinding bodies, liners, and material to interact and grind, thereby refining the material. Due to the continuous feeding of new material at the feed end, a material level difference exists between the feed and discharge ends, which forces the material to flow, and the grinding bodies below...

Axial thrust generated by the falling material also forces its movement, while the internal air flow within the mill assists in the material flow as well. Consequently, although the mill cylinder is horizontally positioned, the material can slowly flow from the feed end to the discharge end, completing the grinding operation.