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Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the rod-mill work index based on the conventional Bond work index
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These
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The Bond Work Index for Rod Mill is a special equipment for testing Bond rod mill work index. Simple lab test can choose rod mill by power method or judge the effects of material properties change to the rod milling process or the operation condition of rod mill by using this equipment. From 1980s, the company developed the equipment and
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Bond Test WI’s (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 m (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod
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The mill power is = 22.5 Watts, calculated by (6). Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power. After time the mill
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Commentary on the apparatus of the Bond rod mill work index The Bond Third Theory of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to calibrate comminution models
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determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a ball mill, Wi, is then calculated from the following
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In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: AG and SAG mills, Ball mills, Rod mills, Crushers, High Pressure Grinding Rolls (HPGR)
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Oct 24, 2018 However, Bond Work Indeces are related to the type of equipment to be used (rod mill, ball mill, SAG uses Drop Ball parameter-Kwhr/m3-, so it is
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Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212 m. Abrasion Index Test
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The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 m. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work
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Calculate the operating work index for the circuit. Ans. 16:8 (kWh t21) b) Circuit feed samples taken at the same time were sent for Bond work index testing. The rod mill test gave RWilab of 14.5 kWht and a ball mill work index BWilab of 13.8 kwh t
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Rod mill power is dependent on mill capacity and work index. Mill power increases with: Increasing rod charge; Increasing mill speed; Increasing mill length. Rowland and Kjos (1980) provided an expression to quantify power draw at the pinion shaft per unit mass of rods: P †“M /
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The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus.The SAGMILLING.COM models expect a mill with a wave liner , and is not compatible with mills using smooth liners
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The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi C, CWi or IWi (impact work index)). The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 12.7 mm ( inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original
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The Bond Index conforming rod charge consists of: 6 rods of 1.25“ diameter and 21“ length; 2 rods of 1.75“ diameter and 21“ length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill
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The Bond impact crushing work index test provides thecoarse size work index for the WiSTDcalculation, specificallythe work index of sizes coarser than 16,000 m. The workindex result in this guideline is given in metric units, butreaders should be aware that both short ton and long tonversions of this measurement appear in other literature
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Jul 30, 2020 Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions. It is a 'locked cycle' test conducted in closed circuit with a laboratory screen
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