What’s the Difference Between Ball Mills and Rod Mills

Published time:19 November 2019

Both the ball mill and the rod mill are designed for grinding materials, but the same as the role of grinding materials and cylinder shape, what’s the difference between ball mills and rod mills? Next, we will introduce the intrinsic properties and construction of the ball mill and the rod mill.
Ball mill details
ball mill and rod mill

Grinding media

The grinding media of ball mill is steel ball, but it of rod mill is steel rod.
Ball Mill Parameter Selection – Power, Rotate Speed, Steel Ball
grinding media


Compared with the ball mill, the rod mill adopts advanced controllable feeding and discharging technology, and can use the appropriate grinding body according to the grinding material. The point contact of the traditional ball mill can be changed into line contact, which can make the discharge granularity more uniform and the output is higher.

The rod mill is mainly used for gravity separation or magnetic separation of tungsten-tin ore and other rare metal ores, because the use of a rod mill can prevent the occurrence of dust pollution caused by excessive pulverization and improve the recovery rate of the sorting operation.

How Much the Gold Ore Ball Mill?
The ball mill is suitable for grinding various ores and other materials, including mineral processing, building materials and chemical industries. The feed both can be dry and wet.
ball mill applications


The finesse of the material milled by the ball mill is 0.074mm-0.4mm, only except for the two small ball mills that have a wider range of 0.075-0.89mm. However, the rod mill fine grinding fineness is about 0.833-0.147mm. In terms of the fineness of the ground material, the ball mill has a finer handling ability.

Can the Ball Mill Grind the Material to 325 Mesh?
On the other hand, the surface area of the steel rod medium in the rod mill is smaller than that of the steel ball medium in the ball mill, so the utilization factor is lower than that of the ball mill of the same processing capacity. Rod mills are often used in coarse grinding operations and are not suitable for fine crushing. Buti in some cases, the rod mill can replace the fine crusher and solve the problem that the discharge port of the fine crusher is easy to block.

Discharge method

The rod mill adopts overflow type and open type discharge, does not use grate type discharge. The diameter of the rod mill discharge end is larger than that of the same size ball mill. When the rod mill speed is lower than the working speed of the same size ball mill, the medium in the rod mill is in a sloping working state.
For the ball mill, depending on the specific requirements, you can choose the overflow type and grate type of discharge method.

5 Ways to Control the Ball Mill Noise

That’s my great honor if the above comparison between the ball mill and the rod mill can help you to choose the equipment that suits your production needs.
In summary, if you have high requirements on the fineness of the material, it is recommended that you choose a ball mill for processing. Because it uses a steel ball to grind more thoroughly, more contact areas, will make the fineness of the finished product higher. How to select a ball mill? we are here to help.

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