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Rod mills operate at lower speed than ball mills since the rods are rolled and not cascaded For an equivalent grind a rod mill uses less steel than a ball mill because of the lower speed and better contact between the media and ore The rod charge must be maintained in good working condition and broken and worn rods must be removed.

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In the wire rod mill of the Kimitsu Works a tolerance of ±0.34 mm for a product diameter of 15 mm was the Rod mills are less common than ball mills for grinding minerals The rods used in the mill usually a high carbon steel can vary in both the length and the diameter.

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The rods grind the ore by tumbling within the the mill similar to the grinding balls in a ball mill To prevent the conditions leading to rod charge tangling the length to diameter ratio is maintained at 1.4 to 1.6 Rod mills accept feed up to about 50 mm 2 in and produce a product in the size range of 3000 to 270 mm –4 to –35 mesh .

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Tubular Rod Mills ScienceDirect Jan 01 2016As the considerations of rod mills are similar to the ball mills some of the problems given below require the use of formulae described for ball mill operations in Chapter 7 8.1 The inner dimensions of a rod mill were 1.8 1.8 m and the largest diameter of rod charged was 76 mm.

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Rod motion in a laboratory rod mill 545 CALCULATION OF MILL POWER 1TORQUE MODEL Because of the complexity of the system it was assumed that the results of tracing the rod path over many cycles could be used to calculate the average torque per rod and hence the mill power by assuming that all rods contributed to the torque.

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May 31 2016 A Rod Mill has for Working Principle its inside filled grinding media in this case STEEL RODS These rods run the length of the machine which is most commonly between eight and sixteen feet in length The diameter of these rods will range from when new between two and four inches The rods are free inside the mill.

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In Mineral Processing Design and Operations Second Edition 2016 8.3.1 Rod Mill Charge Rod mill charges usually occupy about 45 of the internal volume of the mill A closely packed charge of single sized rods will have a porosity of 9.3 With a mixed charge of small and large diameter rods the porosity of a static load could be reduced even further.

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Rod Dimensions Rod tangling is a problem that should be avoided by using straight rods Rods < 6 meters are generally never straight Rods should be 152mm shorter than mill length.

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Rod Mill Grinding Rods 911metallurgist Effect on Rod Mill Power DrawEffect on Rod Mill Power EfficiencyPractical Rod Mill Operation The general relationship between mill power draw and charge level is as shown in Figure 2 As previously discussed the exact shape of this curve and the position of the peak may vary slightly for each particular mill and depend on the liner condition.As

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