Rod Mill

Rod mill gets its name because its grinding body inside the barrel is steel bar. Rod grinding mill, as first-class ore grinding machine, is widely used in the first class grinding in industries such as artificial sand, ore beneficiation plant and power sector in chemical plant. Rod grinding mill is also called rod mill or grinding rod mill.

Working Principle of Rod Mill

Rod mill works by relying on the moderative motion of peripheral rack wheel through electrical machine and reducer or the bradytelic synchronous electrical machine. The barrel is driven by those motions, so it is also called grinding rod mill. There is proper ore grinding medium inside the barrel, namely steel bar. Under the functions of centrifugal force and frictional force, ore grinding medium is raised to a certain height and then falls in drop or draining falling state. The ground material is fed into the barrel from the feeding port and crushed by the moving grinding medium. At last, the final materials are discharged to the next procedure under the overflow and continuous feeding force.

Product Features

When the ore is fed into the rod mill, the coarse ore is at the feeding port but the fine ore is at the discharging port. Consequently, the bar group cannot keep balanced but stay slant, which is also the reason to limit the length of rod bar.

The general ore grinding process in most overseas ore beneficiation plants is made up of crusher, rod mill and ball mill. The rod mill is hardly used in China ore beneficiation plant. The feeding particle of ball mill is too high, which causes the large consumption of energy, grinding medium and lining plate. In addition, the grinding efficiency is relatively higher, product granularity is evener and the over crushing phenomenon is less.

Rod Grinding Mill

The present rod grinding mill is divided into dry rod mill and wet type rod mill.

Rod grinding mill is most widely used in the ore beneficiation and ore grinding process. Therefore, it is also called mineral rod mill, ore rod mill or ore grinder.

In addition, the mill used in coal grinding process is called coal mill. As the common equipment in the thermal power plant, coal mill is used to grind the coal so as to improve the combustion utilization of coal. Consequently, it is also called coal crusher. The mill used in the cement production is also called limestone rod mill.

The Difference Between Rod Mill and Ball Mill

The rod mill and ball mill are both used in the ore grinding process. According to different working conditions, rod mill is suitable for coarse grinding but the ball mill is suitable for fine grinding. The reason is that the grinding medium of rod mill is steel bar and the contact is line contact. However, the grinding medium of ball mill is steel ball and the contact is point contact, so rod mill is also called crushing mill. To sum up, the different contact types decide the different grinding granularity. Rod mill is mainly used in the industries such as coal and chemical industries, quartz sand, silica sand, sand gas, tungsten ore and aluminum soil ore.

Rod mill is the development tendency and is broadly used in the international industries. The more crushing and less grinding concept is gradually accepted by more and more people.

Slag Mill

Rod mill is also called slag mill when grinding the tailing slag. It is mainly used for grinding the tailing slag and reusing the finished products.