Rod Mill

Introduction

The rod mill can be widely used for grinding artificial sand in ore dressing plant, chemical plant and the electricity sector. Rod mill rotates surrounding gear reducer when driven by the motor. The appropriate grinding tool-steel bar is installed inside the cylinder body. The grinding tool, under centrifugal force and friction force, will be promoted to a certain height and then fell down. Finished products will be discharged from the discharging part. 

Structural characteristics

The structure of the rod mill is roughly as same as the ball mill, but there are three differences: 

(1) Rod mill commonly uses steel bars with diameter of 50-100mm as the grinding tool, while ball mill uses steel balls as grinding tool. The length of steel bar is 25-50mm shorter than the tube, and often made up of high-carbon steel with carbon content of 0.8% -1%; the rod load is approximately 35% -45% of the effective volume of the rod mill. Seen with the naked eyes, the horizontal plane of the rod is about 100-200mm below the cylinder centerline. 

(2) For rod mill, the diameter is generally 1.5-2.0m, and the end cap on the liner surfaces shall be the vertical plane, the purpose of which is to prevent and reduce the steel bar from producing chaotic movement in the cylinder body, and ensure the regularity of exercise of steel bars. For ball mill, the cylinder length and diameter are smaller.

(3) The rod mill usually uses the overflow type instead of the grid plate to discharge ore materials; generally, the diameter of row material shall be larger than that of ball mill; and the rotating speed of the rod mill cylinder is less than the speed of ball mill.