Bond Work Index - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document discusses the Bond Work Index test procedure to determine the grindability of materials. The test involves grinding a sample in a ball mill over multiple cycles and analyzing the particle size distribution after each cycle. The data collected is used to calculate the Bond …
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Fig. 2 shows a proportional relationship between the simulated work index (W i(sim)) and mill power drawn (kW). This confirms the low energy consumption based on the low works index values. The limestone ore shows the highest mill power consumption of 0.340 kW and a work index value of 13.0 kWh/ton. However, the lowest belong to the fluorite ore.
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The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm.
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The work indices of various iron ores in the world were measured. From the values of the work indices of the iron ores, the powers required to grind the iron ores were estimated. And thus, …
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3. An operating work index (WiO): A measurement of a specific energy consumption and size reduction in an operating plant. 4. A generic work index that represents an intrinsic ore breakage characteristic that is independent of the apparatus used to determine it (Wi). This, more nebulous work index, is mostly of interest to
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Table of Bond Work Index by Minerals This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table.
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Maxson et al, (1933). It was extended by Bond (1952) to provide a work index result that was empirically calibrated to make a laboratory work index match the corresponding work index measured in an industrial grinding mill. The fitted equation, in metric form, is given as Equation (1). (1) 𝑊𝑖= 1.1023×44.5 𝑃100 0.23× À0.82×(10 √ ...
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A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006).This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball …
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BondWork Index analysis (BWI): The Bond work index is widely acceptable method for grindability of the ore. The test procedure adopted for BWI was according to (IS: 10218, 1982) after some modification by F.C Bond of Allis-Chalmers in 1991. The work index of the sample was calculated using Bond's revised equation (1): Work Index (W i)= 44.5 ...
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This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore …
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The common methods for absolute grindability characterization include unit productivity, Bond crushing work index, Thompson work index, grinding efficiency, and Hardgrove grindability index. Ore grindability is mainly used to calculate and select the specifications, models, processing capacity, and number of grinding mills, and to determine ...
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Table 4 shows the Bond work indices for some minerals and industrial materials from [25]. Note that the real circuit mills present work indices greater than those in laboratory tests, in a...
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Bond index is useful in designing of grinding system in mineral processing. In this study, the Bond work index of a low grade iron ore is determined using modified Bond's method. Samples of …
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Bond testing is a standard part of ore characterization for comminution circuits design and evaluation of performance. Bond Work Index (BWI) is usually understood as an ore grindability parameter (Ahmadi and Shahsavari, 2009) in order to compare different material behavior, estimate the energy required for grinding, and for ball mill scale-up.
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The work index (W i) for an unidentified iron ore can vary from 4 to 31 kWh/t [32]. For the first calculation of the specific energy consumption ( W ), a representative value of 14 kWh/t was considered.
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The company is also a key user of Metal Bulletin's 62% Fe Iron Ore Index (MBIOI-62) for its mid-grade products. The days of the annual "mating season" – when steelmakers and major iron ore miners would play brinkmanship over who would give way first over setting an annual iron ore price – are long over.
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Shown in the table below is typical Work Index, reflecting the different rock characteristics. It shows for example, that their is more energy required to …
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Diagram ΔG°/T for the iron phases in the Fe-O system. (1) ΔG° of the Fe 3 O 4 (2) ΔG° of the FeO (3) ΔG° of the Fe 3 O 4 obtained from the FeO (4) ΔG° of the Fe 2 O 3 obtained from the ...
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The work index of Muro iron ore was determined using the modified Bond's method also known as Berry and Bruce method. This study used iron ore obtained from Muro town, a community in Toto LGA, Nasarawa state as the test ore. Marble and Granite which was separately used as the reference ores were obtained from Muro environs. 100 g each of the …
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IRON ORE SALIENT DATA OF ORE DRESSING INVESTIGATIONS CARRIED OUT DURING 2001-2012 BY ORE DRESSING DIVISION, INDIAN BUREAU OF MINES SR. CONCENTRATE NO. R.I. ... (Departmental work). Not determined Val. Mineral Not determined Gangue Not determined 96.68 88.35 75.45 66.96 33.00 23.00 15.00 11.00 Sub-sieve size analysis by
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The work index of Muro iron ore was determined using the modified Bond's method also known as Berry and Bruce method. This study used iron ore obtained from Muro town, a community in Toto LGA, Nasarawa state as the test ore. Marble and Granite which was separately used as the reference ores were obtained from Muro environs. 100 g each of the ...
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Bond index is useful in designing of grinding system in mineral processing. In this study, the Bond work index of Birnin- Gwari iron ore in northern Nigeria is determined using modified Bond's …
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The work index values indicate the energy requirements in reducing the particle size. Hard ores possess higher work index values than softer rocks. In the present research, the BHJ ore showed a higher (15.4 kWh/ton) work index value than the BHQ ore (12.4 kWh/ton). Work index values showed an increasing trend with decreasing product fineness.
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The work index of Muro iron ore was determined using the modified Bond's method also known as Berry and Bruce method. This study used iron ore obtained from Muro town, a community in Toto LGA, Nasarawa state as the test ore. Marble and Granite which
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For design purposes, you need an estimation or prediction of your SAG Mill's tonnage; well, there are 3 ways to generate good rock "ore" hardness testing data for SAG and ball mill circuit grindability from half drill core. We can abbreviate the discussion by saying there are three "faiths" of grinding, and there are small-scale tests suitable for all three of the major …
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Bond Abrasion Index (Ai) conducted upon charges of -19+12.7mm ore via a rotating impeller incorporating a Bisalloy of 500 Brinell hardness steel paddle within a contra-rotating drum. Bond rod mill work index (RWi). Traditional dry grinding lock cycle test in a rod mill conducted on ore charges crushed to P 100 12.7 mm. Bond ball mill work index ...
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The document presents tables from various sources reporting the specific gravity, number of samples tested, and work index in kWh/t for a variety of materials. The tables include data on over 50 materials including ores, rocks, minerals, and …
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This paper aimed to compare the WI results for iron and gold ores to the tests performed by Schneider (2015). ... KEYWORDS: Work index; Grinding; Gold ore, ion ore, closing screens aperture.
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Rittinger and Kick had proposed the first two. To apply it he defined "Work Index" (W_i) for an ore as the specific energy (kWh/tonne) required to reduce the ore from infinite grain size to 100 µm and he showed that for any ore the Work Index can be calculated from plant data and determined in a laboratory test.
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Walkiewicz et al. (1995) under The U.S. Bureau of Mines (USBM), conducted studies using rapid microwave heating to stress fracture ore samples and the standard Bond's grindability tests showed that microwave heating reduced the …
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Table 4 shows the Bond work indices for some minerals and industrial materials from [25]. Note that the real circuit mills present work indices greater than those in laboratory tests, in a typical ...
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characterisation of an iron ore resource is critical to effective project evaluation, process design, risk management and project execution. SGS collaborates with major, global iron ore producers and consistently delivers accurate metallurgical test work results. SGS has recently completed the expan-sion of its state-of-the art iron ore testing
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The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F(1) where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to reduce a s…
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