Three Structure Differences Between Rod Mill and Ball Mill

Apr 30, 2014 by

Ball mill is the key equipment when the crushed materials need to be ground. Ball mill is one of high fine grinding machines that are widely used in industrial production. Rod mill is usually wet overflow type and can be used as the first level open grinding. It is widely used as the first level ore grinding in artificial stone and sand, dressing plant, power department of chemical plant.

The structure of the rod mill is quite similar to ball mill, but there are three points of difference:

1. Rod mill uses the steel rod whose diameter is 50-100mm as grinding medium but the ball mill uses steel ball as grinding medium. The steel rod is 25-50mm shorter than the barrel and the rod is made by high-carbon steel whose steel content is 0.8%-1%. The charge weight of rod is about 35%-45% of the effective volume of rod milling machine. When observed by eyes, the horizontal plane of rod is about 100-200 m lower to the center line of barrel.

2. In the rod mill, the ratio between barrel length and diameter is about 1.5-2.0. The inside surface of lining board on the shell cover must be vertical plane so that in the barrel, the steel rod can not do chaos movement, be bent or broken and the steel rod can move regularly. In the ball mill, the ratio between barrel length and diameter is less, which is often a little larger than 1

3. Rod mill uses the overflow type or opening type ore discharging instead of the waffle slab ore discharging. The diameter of hollow shaft neck in ore discharging terminal is larger than the ball mill with same specification. The barrel rotating speed of the rod mill should be less than the ball mill with same specification so that the medium inside can work in the falling type.

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