The difference between ball mill and rod mill

Whether is from the external shape or from the analysis of the working principle, ball mill, rod mill are very similar, really want to make people not clear. What is the difference of ball mill and rod mill?

Both the ball mill and the rod mill are round drums, both ends of which are covered with a lid, with a hollow journal in the lid, and the drum rotates in the journal bearing.

First let us look at the common ground between the two: ball mill and rod mill are both horizontal placed cylindrical grinding equipment. When the cylinder is rotating, the grinding medium in the cylinder body under the action of friction and centrifugal force, with the rotation of the cylinder was raised to a certain height, and then at a certain line speed throwing, Material impact, grinding and extrusion, the material crushed. The grinding material enters from one end of the mill, and the finely ground product is discharged from the other end of the machine by the force of the continuous feeding of the material, the hydraulic force and the wind force.

The ball mill and the rod mill generally by the asynchronous motor or the synchronous electrical machinery drag, uses the unilateral transmission, the bilateral transmission or by the electric motor in the tube end direct drag. The rotational speed of the cylinder is designed below the critical speed. In order to obtain better impact, some ball mill speed can be adjusted. Ball and rod mills are suitable for wet grinding and dry grinding of ores, rocks and other abrasive materials of various hardnesses. The ball mill can also be made into a conical roller.

So what are Specific differences between ball mill and rod mill? Specific expression is as follows:

1. The ball mill and rod mill is mainly used for grinding the size of not more than 60mm of various hardness of ore and other materials used. The product obtained after pulverization with a ball mill has a variation in the particle size ranging from 1.5 mm to 1.5 mm, and the resulting product after pulverization with a rod mill has a variation in particle size ranging from 6 mm to less 6 mm.

2. Ball mill and rod mill according to the different medium and distinguish. Ball mill grinding medium is steel balls, rod mill medium is steel bar, so the level of fall after contact with the mineral surface line, selective crushing effect, that is, according to the size of the large pieces from small to small pieces, so over-grinding Light, grinding product size uniformity, suitable for coarse grinding or grinding products require grinding over light re-election plant.

From this we can see that the principle of ball mill and rod mill are roughly the same and structure is very similar, and the two main differences are also reflected in the name of: the grinding medium is the steel ball that is the ball mill, the medium is steel called the rod mill; both of the broken product size is different.