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Differences and commonalities between rod mills and ball mills

Differences and commonalities between rod mills and ball mills

Grinding equipment commonly used ingrinding operations in mineral processing plants has rod mills and ball mills,both of which are used to grind materials. Since they are used to grindmaterials, why should they be designed as two different equipments? How tochoose it? Here is the difference and commonality between the rod mill and theball mill to help you better understand and understand these two devices.

Rod mill and ball mill have in common

Same structure

The structure of the rod mill and the ballmill 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 afeeder, a large and small gear, a feeding end, a discharge end, a transmissiondevice and the like.

Work principle the same way

The working principle of the rod mill andthe ball mill is the same. The rotation of the cylinder is driven by thetransmission device, and the grinding medium is lifted to a certain height forthrowing. Under the action of friction and centrifugal force, the material isimpacted, ground and squeezed. Press to achieve the effect of grindingmaterials.

The difference between rod mill and ballmill

The grinding body works differently

We know that the rod mill is called a rodmill because its grinding medium is a steel rod, and the grinding medium of theball 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 baris in motion, the gap between the rod and the rod is a regular strip, whichadds a screening effect to the material, and the large particle material isbrought to the highest position during the work, which make the large particlematerial get better crushing effect.

Therefore, the contact between the steelbar and the material is a line contact, and the steel ball is in point contactwith the material, which is the difference in the working mode of the grindingbody.

Applicable materials are different

Rod mills are suitable for brittle materialssuch as coal. In addition, due to the excessive pulverization of rod mills,they are also suitable for tungsten ore or other rare metal ores. They areusually used in re-election or magnetic separation lines, and also in thesecond stage. A section of grinding; the application of the ball mill is wider,and the metal, non-metal or stone can be ground by a ball mill.

Different discharge fineness

The ball mill has finer fineness, usuallywith a particle size of 0.074-0.4 mm, and a rod mill with a fineness of0.833-0.147 mm.

Different classification

Ball mills can be divided into overflowtype and lattice type ball mills, while rod mills are classified into overflowtype rod mills and open type rod mills.

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