The Bond Work Index is material specific and is obtained from laboratory crushing tests on the feed material. Hard and brittle materials have a work index in the range 4 × 10 4 − 8 × 10 4 J/kg. Bond's law holds reasonably well for a variety of materials undergoing coarse, medium and fine size reduction. (Eq. 14.3a) can also be reduced to
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The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
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terms. The index is defined as the energy required to crush from infinite size down to 100 µm, hence the 10 inside the brackets. Bond's Work Index values, in kWh per short ton: i.e. 2000 lbs or 907 kg, roughly follow the Moh's scale of hardness, see Table 11.1. In Summary, Kick's law is better for larger particles and Rittinger's
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The Bond crushing work index test is an inherently poor test and has been shown time and time again in Round Robin studies to have poor precision (repeatability). Angove and Dunne's paper on the subject gives results that show factors of over 2 in terms of reported work index values from the same sample from different labs.
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The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
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The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index. Remember, the higher the Work Index the more work required to crush the rock. This will impact the equipment chosen for your project.
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created, Rittinger's Law fits the experimental data better. Bond's law • The work required to form particles of size Dp from very large feed is proportional to the square root of the surface to volume ratio of the product • P/f = 0.3162 wi 1 …
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The Bond' Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size. Bond's impact method comes from a double mirrored …
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The Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and …
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The present work deals with the impact crusher energy efficiency at San Andres Zeolitic Plant. Varying the operational parameters levels (rotor velocity, hammer row number and crusher capacity ...
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Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy …
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The friability value S 7 was measured by the brittleness test (Fig. 1), which gives a value for rock resistance to crushing due to repeated weight-drop (7) impacts.The brittleness test apparatus is designed to determine the grindability characteristics of Tauros limestones, which are used in cement production (Ozkahraman and Sirin, 1998).The …
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The crushing work index (CWi), estimated on the basis of the twinpendulum test, has been proposed by Fred Bond and accumulates a long track record in predicting the performance of crushing ...
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Section snippets Grinding kinetics in the Bond ball mill. Tests of grinding kinetics in the Bond ball mill (Fig. 1, Fig. 2) has shown that over a shorter grinding period, the process follows the law of first order kinetics R = R 0 e-kt where R = test-sieve oversize at the time (t); R 0 = test sieve at the beginning of grinding (t = 0); k: grinding rate …
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The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus. Typically twenty ...
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The Bond crushing work index is a measure of material strength and is determined using a simple twin pendulum apparatus and a standard procedure. The Bond impact test attempts to emulate the crushing action that occurs inside the chamber of jaw, cone and gyratory crushers, where particles may not be broken in the first nipping cycle, …
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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 ...
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crushing, or impact, work index. The test consists of dropping two pendulum-mounted hammers simultaneously against individual irregularly-shaped ... crushing from Bond's law of comminution, given ...
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The Bond work index of the ore has been determined. (This result closely matches the reference value for hematite given in Table 1.) It remains to compute the work required for the second set of conditions, The energy required to grind two tons of the ore in question is. References • ANDERSON, C., DUNNE, R., and UHRIE, J. (Eds.) (2014).
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Rittinger's law have been shown to apply over limited ranges of particle size, provided that ( K_r ) is calculated experimentally by tests in a machine of the type to be used and with the material to be crushed. …
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The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
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The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. Although considered an industry standard, Bond did not fully define that procedure, and therefore significant discrepancies in test results can sometimes be …
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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. ... Bond's law for coarse grinding and secondary/tertiary crushing; and Kick's law for …
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The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson …
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The work index in Bond's law for crushing of solids has the following dimensions . No units (dimensionless) kWh/ton. kW/ton. kW m(^{1/2})/ton. GATE-CH--mo-1mark. -mo. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
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Work Index (𝑊𝑖 ) is a parameter used to quantify the gross energy required in kilowatt hours per ton of feed needed to reduce a very large feed to such a size that 80% of the crushed product is finer than a 100 microns size. It …
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Related: Sphericity Calculator for different shapes Example Problem on Kick's Law. A material is crushed in a Blake jaw crusher such that the average size of particle is reduced from 50 mm to 10 mm with the consumption of energy of 13.0 kW/(Kg/s). what would be consumption of energy needed to crush the same material of average size 75mm to an …
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Question: Bond crushing law and work index Bond has suggested a law intermediate between Rittinger's and Kick's laws, by putting p= -3/2 in equation 2.1. Thus: E = 20 acਊਣ ਦ) 20/(2)(:-) = 20 (2.5) where: L 9= plz show me with steps how to …
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The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory …
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