Ball mill and rod mill are the common grinding equipment applied in the grinding process. However, both ball mills and rod mills are long cylindrical grinding equipment, which is not easy to distinguish from the appearance of the machine. Their cylinders are equipped with grinding medium, feeder, gears, and transmission device. Ball mill and rod mill have similar working principle: the materials are transferred to the grinding chamber through the quill shaft uniformly. There are ladder liner and ripple liner and different specifications of steel balls in the chamber. The centrifugal force caused by rotation of barrel brings the steel balls or rods to a certain height and impact and grind the materials. The ground materials are discharged through the discharging board thus the grinding process is finished.

BALL MILL VS ROD MILL: what are the differences between the two devices that are so similar and how to select suitable equipment? Please find the answer in this article.

1.Structure

The ratio of barrel length to rod mill diameter is generally 1.5 to 2.0, and the inner surface of the liner on the end cap is a vertical plane. Rod mills generally use 50-100mm diameter steel rods as the grinding medium, while ball mills use steel balls as the grinding medium.

2.Grinding media filling rate

Average fill rate refers to the percentage of grinding material in the volume of the grinder. For different grinding methods, grinding structures, average shapes and operating conditions, the average fill rate has an available range. Usually, the filling rate of ball mill is 40-50%, and that of rod mill is 35-45%.

3.Application

In the second stage grinding process, the rod mill is generally used as the first stage grinding equipment, which has large production capacity and high efficiency. In soft or not too hard ore processing, the rod mill can instead short head cone crusher for fine crushing, which is not only simple in configuration, but also inexpensive. However, due to the finer grinding of ball mills, it is subject to excessive pulverization, which is not suitable for re-election in metal processing.

The above is the main content of this article. The ball mill and the rod mill are the same type of machine on the appearance, but there are still great differences in the interior. It is very necessary to select a suitable machine for the production to optimize the product effect and maximize its efficiency.