During the work of rotary rod mill grinder, the motor drives through the reducer and surrounding gear reducer, to drive the cylinder to rotate. There are suitable grinding media-steel bars in the cylinder body. Under the centrifugal force and friction force, grinding medium will be elevated to a certain height, and then fell in purging fall state. The material to be milled will be fed continuously into the cylinder from the feeding mouth, crushed by the mobile shattered grinding media, and then discharged finished material through the overflow and continuous feeding power, for the next work step.

Grinding media for rod grinding mill is grinding rod which is generally not exceed 7 metres in length, because too long grinding rod is easy to be twined; and the diameter of grinding rod is between 75~150 mm.Grinding rods should have sufficient rigidity and hardness so that it can be straight during using process; if rod is too soft, it is easy to be bent in the rotation process of the cylinder.