The ball mill is the horizontal cylinder type machine which is grinding ore in metal and non-metal mines such as the gold, silver, copper, iron and aluminum cement plant. The hollow cylinder rotates under the drive of motor and reducer and is equipped with steel ball inside. One end of the cylinder is provided with a conveyor belt to transport ore,after the ore enters the cylinder of the ball mill, it is ground into powder shape under the impact and grinding effect of the steel ball, and then discharged from the other end to enter the next process.

The steel ball filled in the barrel of the ball mill which is collectively called "ball mill steel ball".