WEBJan 1, 2009 · 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 ...
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WEBMar 1, 2003 · The grindability test was conducted by a power index ball mill (XMGQ) with the dry closedcircuit grinding method. The standard Bond work index was calculated using the data at 250% of the ...
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WEBJul 31, 2015 · This grindability test is conducted in a. Bond ball mill of ΦD/L = / m dimensions at the speed of 70 rpm. The. mill is loaded with kg standard sized balls and 700 cm 3 of ...
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WEBA quick method for Bond work index approximate value determination. D. Todorović Maja Trumić L. Andric V. Milošević Milan Trumić. Engineering, Materials Science. 2016. The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test.
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WEBSep 8, 2021 · Colorado School of Mines. Golden, Colorado 80401. E cganders Abstract. Research was performed to make an objective comparison of Bond Ball Mill Grindability Work. Index results derived ...
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WEBOct 7, 2015 · The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if necessary. The power prediction is fairly accurate for devices that produce a product with a size distribution parallel to that of the feed.
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WEBJun 17, 2021 · The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is timeconsuming (close to 5 hours ...
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WEBDec 10, 2016 · For the evaluation of laboratory and industrial experiments, the work index can be determined as follows: BWI = P 1 × G 10 P − 10 F where BWI = Bond's work index (kWh/sh. Ton), F = 80% passing size of original feed (μm), P = 80% passing size of circuit product (μm), P1 = Testsieve size (μm) and G = Net grams of .
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WEBDOI: / Corpus ID: ; A new methodology to obtain a corrected Bond ball mill work index valid with nonstandard feed size article{Nikoli2022ANM, title={A new methodology to obtain a corrected Bond ball mill work index valid with nonstandard feed size}, author={Vladimir Nikoli{'c} and .
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WEBApr 1, 2022 · Some ores will work better using other comminution methods, from an economic point of view, but SAG milling must be part of every new project evaluation. 2. ... The introduction of the SAGDesign test (which includes a Bond Ball Mill Work Index test on SAG ground ore) in 2004, for measuring ore hardness, has been successful in .
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WEBSep 18, 2023 · The results showed that using the nonstandard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=; β=, and γ = ), are unable to predict the Work Index ...
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WEBJul 20, 2023 · From a practical point of view, the work index is divided into ball milling work index (the short form of Bond ball milling work index), rod milling work index, and crushing work index. The corresponding methods of test and determination with a small amount of ore samples in the laboratory are put forward, too. These test methods .
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WEBJun 19, 2015 · The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and .
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WEBMar 1, 2003 · Analysis of normalized test results show, with a correlation factor R 2 of, that the revolutions required in all the Bond Work index mill tests conducted (29–419 revolutions) corresponds to a specific grinding energy per Bond Mill revolution of kWh/ton for a material corrected to a tapped apparent density of 1 t/m 3 and for ...
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WEBMar 1, 1983 · Then the Bond Work Index is calculated, in kilowatt hours per ton, from the formula Il'Itest = ()()1 j (Pto_=3)(GbP) X i0 10 1/xe, xGT I where p, is the opening of the classifying screen used in the test; xQ7, is the 80%passingsize of the product in micrometers; and xGT the 80%asize of the original feed, which is near 2000 .
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WEBJun 16, 2015 · For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, cm x cm with following ball charge: Agitator ...
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WEBMar 1, 2003 · The standard ball mill Bond grindability test The standard Bond grindability test is a closedcycle dry grinding and screening process, which is carried out until steady state condition is obtained. This test has been described as follows ( Bond and Maxson, 1943 ; Yap et al., 1982 ; Austin and Brame, 1983 ; Magdalinovic, 1989 ).
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WEBOct 5, 2022 · The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodology ...
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WEBOct 9, 2021 · In particular, the Bond work index (wi) is considered a critical parameter at an industrial scale, provided that power consumption in comminution operations accounts for up to 40% of operational costs. Despite this, the variability of wi when performing the ball mill Bond's standard test is not always understood enough.
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WEBThe precise method used to do the adjustment is based on Josephin Doll (2018). Several Bond ball mill grindability tests were conducted using the New Afton ore sample. The Specific Energy Consumption (E) is computed for each test using both the methods of Bond and Morrell. Example using the Josefin Doll published signature plot:
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WEBSep 10, 2013 · Section snippets Apparatus and methods. Traditional Bond ball mill (Ø305 × 305 mm) and Hardgrove mill were used for the traditional Hardgrove Grindability Index (HGI) was determined by using the following equation: HGI = 13 + m P where m P means the mass of product particles finer 75 μm in grams. From this .
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WEBJan 1, 2013 · To calculate the Bond work index ( Wi) in a standard laboratory scale rodmill, Bond derived the following equation: W i = 62 P i G i 10 P 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the testsieve size in μm [1]. The standard procedure to determine all Bond work ...
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WEBJan 31, 2009 · The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ...
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WEBJun 6, 2015 · 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 appliion methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.. Below describes in general terms the Bond Work Index .
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WEBJul 12, 2021 · Over the years, alternative procedures to the Bond grindability test have been proposed aiming to avoid the need for the standard mill or to reduce and simplify the grinding procedure. Some of them use the standard mill, while others are based on a nonstandard mill or computation techniques. Therefore, papers targeting to propose a .
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WEBMar 14, 2015 · Calculate a Mill's Operating Work Index. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its appliion is not yet .
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