can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where ...
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. …
The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm. Any screen size below 600µm can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test. GSL can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod …
bond s rod mill for work index. bond amp 39 s rod mill for work asindex Bond Rod Mill Index Test JKTech Rod Mill Rod mills are very similar to ball mills, except they use long rods for grinding media The rods grind the ore by tumbling within the the mill To prevent the conditions leading to rod charge tangling, the length to diameter ratio is ...
It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills). The relationship between wi and …
The following equation is used to determine the power that a rod mill should draw. The Bottom Table lists many of the common size rod mills giving speed, loading and power data. The rod mill motor power is in horsepower at the mill pinion-shaft. For different length rod mills power varies directly as rod length.
Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mill) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond …
The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective grinding length ...
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 ... 1/26/2003 …
The coatings were tested in accordance with the standards for this type of refractory A c c e p t e d M a n u s c r i p t materials, 18,19 and with respect to our previous works in this field, 11 ...
A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. ... [26]. In this test, the core's length to diameter ratio is equal to one and the minimum core diameter is 54 mm. Hardness test was applied based on ISRM suggested method by Aydin [28]. The test was performed on …
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 …
Bond Rod Mill Work Index. The standard bond rod mill work index test procedure is firstly to stage crush the feed to pass 12.7 mm, and size a representative sample.the …
The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: …
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 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
The method is also described in Procemin 2022 paper [Secrets of the Bond Ball Mill Grindability Test] Computing Mib from incomplete Ball Mill Work Index data. Use this nomograph to compute an Mib from a ball mill …
To calculate Bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in Fig. 2.The plot was used to find F 80 of the samples for calculations. Fig. 3, Fig. 4 show the grinding kinetics of Pb, Cu, Fe, and Mn ores in the Bond rod-mill in different test-sieves. The slopes of all lines in the figures …
The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill. The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is …
BOND WORK INDEX. The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where. W= the energy input (Work input) per ton, kwh/metric ton. WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore)
The three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product …
The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxson (1943). It states that the apparatus is a …
Ball Mills - Mineral Processing & Metallurgy. Difference Between a Rod Mill and Ball Mill. Rod Mills has a very define and narrow discharge product size range. Feeding a Rod Mill finer rocks will greatly impact its tonnage while not significantly affect its discharge product sizes. The 3.5" diameter rod of a mill, can only grind so fine.
Using the Bond work index to measure operating comminution efficiency ... "Selection of rod mills, ball mills, pebble mills, and regrind mills," in Design and Installation of Comminution Circuits, Andrew L. Mular and Gerald V. Jergensen, eds., SME, Chapter 23, pp. 393–438.
An improved method using less mass compared to the Bond Ball Mill Work Index test. The JK Bond Ball Mill (JKBBM) test, is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size ( passing 3.35 mm) as the Bond Ball Mill Work Index test. The test requires ...
For the purposes of this paper, it is useful to classify three types of work indices: 1. A grindability measurement made in a laboratory work index apparatus, such as a ball …
Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes Yardin Josefin1*, A.G. Doll2 1. Student /University of British Columbia/ NBK Institute of Mining Engineering, Canada ... SAG Belt Start 2626.5 216.0 1.03 26.6 12.9 SAG Belt Mid 2627.2 212.1 1.05 25.8 12.7 212 GeoMet Composite 2627.2 154.9 0.92 25.1 15.3 SAG Belt …
The Bond rod-mill work index is used in conjunction with Bond's third theory of comminution to merely calculate net energy requirements for sizing rod-mills. This test was originally developed in the mid 1930s by F.C. Bond. Though, it was altered in succeeding years, it has essentially remained unchanged since 1961 [1]. ...
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. ... Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd . by David Michaud February 29, 2024 June 19, 2015 Categories Grinding.
To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h …
The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory crushers) or closed-side settings (cone crushers) for a given product size.P80 = …
Bond's work index is very useful in blasting and communition process, but its determination is very lengthy and cumbersome process ... law suitable for crushing range above 1 cm in diameter and the Bond's theory is reasonably accurate in conventional rod-mill and ball-mill grinding (Hukki, 1962). Some researchers also tried to modify these ...
In the paper proposed by García et al. [5], a deep study on the Bond ball-mill and Bond rod-mill standard tests is shown with different ores. The most impacting result of this work is the ...
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