The grinding equipment commonly used in the grinding operation of the ore dressing factory has a rod mill and a ball mill. Both of them are used for grinding materials. Since they are all used for grinding materials, why should they be designed as two different equipments? How to choose when choosing? Here we introduce you to the differences and commonalities between rod mills and ball mills to help you better understand and understand these two devices.
First, the common point of the rod mill and the ball mill
1. The Same Structure
The structure of the rod mill and the ball mill are basically the same, and each is a horizontal cylinder type structure, and the barrel is provided with a grinding medium, which is matched with a feeder, a large and small gear, a feeding end, a discharge end, a transmission device and the like.
2. The Same Working Principle
The working principle of the rod mill and the ball mill is the same. The rotation of the cylinder is driven by the transmission device, and the grinding medium is lifted to a certain height for throwing. Under the action of friction and centrifugal force, the material is impacted, ground and squeezed. Press to achieve the effect of grinding materials.
Second, the difference between rod mill and ball mill
1. The Grinding Body Eorks Differently
We know that the rod mill is called a rod mill because its grinding medium is a steel rod, and the grinding medium of the ball mill is a steel ball. Due to the different shapes of the abrasive bodies, their working methods also have their own characteristics. When the steel bar is in motion, the gap between the rod and the rod is a regular strip, which adds a screening effect to the material, and the large particle material is brought to the highest position during the work, which is Make the large particle material get better crushing effect.
Therefore, the contact between the steel bar and the material is a line contact, and the steel ball is in point contact with the material, which is the difference in the working mode of the grinding body.
2. The Applicable Materials are Different
Rod mills are suitable for brittle materials such as coal. In addition, due to the excessive pulverization of the rod mill, it is also suitable for tungsten ore or other rare metal ores, usually used in re-election or magnetic separation production lines, and also used in a section of two-stage grinding. The application range of the ball mill is more Wide, metal, non-metal or stone can be ground with a ball mill.
3. Different Fineness of Discharge
The ball mill has finer fineness, usually with a particle size of 0.074-0.4 mm, and a rod mill with a fineness of 0.833-0.147 mm.
4. Different Classification Methods
Ball mills can be divided into overflow type and lattice type ball mills, while rod mills are classified into overflow type rod mills and open type rod mills.
Third, how to choose rod mill and ball mill in production
Above we introduced the difference and commonality between the rod mill and the ball mill, so how to choose in production?If you want to grind a brittle material, a rare metal ore, a rod mill, and other materials, choose a ball mill.If you do not want to find the fineness of the material but the high demand for the output, choose the rod mill, and vice versa.In addition, the first section of the re-election, magnetic separation production line or the second-stage grinding can be selected as a rod mill, and other sorting methods are selected as ball mills.
