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Rod Mill

CIC’s equipment includes leading standardized heavy equipment and machinery products and related heavy machinery services, which can be sold directly to end customers, business partners, and EPC projects. As a professional heavy equipment companies, CIC serves multiple roles, such as, cement machinery suppliers, mining machinery manufacturers, grinding mill manufacturer, rotary kiln manufacturer, rotary dryer manufacturer, sludge dryer manufacturer and so on.

Rod millis very similar to ball mill except for the use of steel rods as grinding media. Steel rods grind the ore by rolling and rotating in the rod mill. The feeding of rod mill is about 50 mm and the output particle size is between -4 and 35 mesh.

Application Fields of Rod Mill

lRod mills are widely used for mine, cement, silicate products, steel slag, construction materials, refractory materials, fertilizers, glass, ceramics and other materials.

lUsed for grinding rare metal ore

lRod mill is applied to the gravity separation or magnetic separation plant of tungsten tin ore and other rare metal ores to prevent over-crushing.

lIn the first grinding stage

lThe production capacity will be larger and the efficiency will be higher if the rod mill is used for the first stage grinding equipment to grind materials from 20~6 mm to 3~1 mm in the two-stage grinding process.

lCone crusher can be replaced for fine crushing

lThe short-head cone crusher can be replaced by the rod mill for fine crushing in some cases. Rod usage of rod mill is simpler and cheaper than a closed circuit formed by the short-head cone crusher and the sieve when processing 19-25 mm (or even 32 mm) to 6-10 mesh soft ores (especially viscous ores).

Advantages of Rod Mill

Saving power

As one of the rod mill suppliersand rod mill manufacturers, CICoffers many high quality products with competitive rod mill price. The rods have a screening effect on the materials in the process of movement, which can make the large particle material be lifted to the high position of each layer and concentrated to the place with strong crushing ability. Therefore, the high work efficiency and the low power consumption is obtained.

Few over-crushing

It is first crushed into coarse particles and second ground into smaller ones when the ore is ground by the steel rods, thereby the risk of over-crushing is reduced.

More uniform discharge size

The surface contact of traditional ball mill is changed to line contact by rod mill.

The coarse particles are sandwiched between rods and liner when the rod rotates and rises along with the liner, making the fine particles to pass through the gap of rods, which is conducive to crushing coarse particles, so the coarse particles are concentrated in the place where the grinding medium hits. So it is suitable for ores with different hardness (Mohs hardness 5.5~12) due to more uniform and lighter over-crushing rod mill product.

Adjustable discharge fineness

There are two devices which work at the same time is a fineness control device and a screening device for discharging inside the rod mill, so the particle size of the material produced by the rod mill can be adjusted according to the needs of user.

The size of ground particles can be ensured effectively because smaller mineral particles can be obtained by adjusting size.

Structure & Working Principle of Rod Mill

The rod mill is driven by the motor through the reducer and the surrounding large gear or by the low-speed synchronous motor directly through the surrounding gear to drive the shell rotation. The shell is equipped with the appropriate grinding medium steel rod. Under the action of centrifugal force and friction force, the grinding medium is lifted to a certain height and falls in the state of dropping or discharging. The grinding material is continuously into the shell by the ore feeder and is crushed by the moving grinding medium, the product is discharged out of the machine through the overflow and continuous force of the ore, so as to carry out the next working stage.

Features of Rod Mill

lThe steel rod with a diameter of 50-100 mm, which is usually made of high carbon steel (containing 0.8%-1% carbon) is used as the grinding medium. The length of the steel rod is 25-50 mm shorter than that of the shell.

lThe loading amount of the rod is about 35%-45% of the effective volume of the rod mill. The horizontal plane of the rod is about 100-200 mm below the centerline of the shell.

lThe ratio of the length of the rod mill to the diameter is generally 1.5-2.0, the inner surface of the liner on the end cover should be a vertical plane. The purpose is to prevent and reduce the chaotic movement, bending, and breaking of the steel rod in the cylinder to ensure that the steel rod moves regularly.

lThere is no need to use grate plate for ore discharging, but overflow type and open type is needed to discharging; the diameter of the hollow journal of the discharging end is generally larger than that of the same size ball mill.

lFor the same specification, the rotation speed of the rod mill is lower than the working speed of the ball mill, so that the medium inside is in the sloping state.



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