The Component of Ball Mill and Its Working Principle
Ball mill is widely used for milling various kinds of ores or rocks in metal and non-metal mining and building material industry. The main bearing of the ball mill with the shell diameter 900-2400mm is spherical liner bearing.

components
A ball mill operates by rotating a cylinder with steel grinding balls, for the ball to fall back into the cylinder and onto the material to the ground. The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. The larger the diameter is, the slower the rotation will be. If the peripheral of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill.

Illustration of working principle
Ball mils are generally used to grind material 1\4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize continuously being recalculated back to the mill to be reduced.