6 L.M. Tavares & M.A.C.W. da Silveira The Bond work index has also been used, in conjunction with empirical relationships, to estimate capacity factors of jaw, cone and gyratory crushers
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Ore hardness can be estimated using commercially available standard techniques such as the SAG Power Index (SPI), Bond Work Index (BWI), and JK Drop Weight (JKDW) tests (Bailey et al., 2009 ...
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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 small self-grinding closed-circuit …
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Three Bond work index tests are commonly used in the industry. This essay discusses some observations from SAGMILLING database of published grindability results about relationships, and lack thereof, between the Bond comminution tests. A further comment is made about the Bond abrasion index a…
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Comminution efficiency can be expressed in three different ways. Theoretical Efficiency: actual energy consumed, in a comminution machine compared to the theoretical energy required to make the size reduction. Operating Efficiency: compares the operating work index, calculated from production comminution machinery operating data, to the Bond Work …
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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 obtained due to ...
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direct comparison of the actual testing apparatus used for Bond Work Index determinations. While the Bond Work Index and procedure have become a world standard for measuring the energy required to grind material and designing grinding circuits, the test is highly empirical and can vary significantly as a result. According to one isolated study ...
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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 ...
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The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements …
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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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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.
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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 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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Using the Bond work index to measure operating comminution efficiency Published: 01 November 1998 Volume 15, pages 32–36, ( 1998 )
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The Bond Crushing Law calculator calculates the energy required for crushing of a solid material based on Bond's Law. It helps in predicting the energy needed to reduce the size of a given material from a specified initial …
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The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...
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To determine the Bond's work index, the samples were prepared by crushing large lumps of basalt, slate and granite in a dodge type jaw crusher. A gape of 4.8 mm was set in primary stage and 3.6 mm in the secondary stage so as to avoid the extra fine particles. 2–3 pieces of sample lumps close to cubical shape weighing cumulatively nearly 50 g ...
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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 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 comminution plants designing. ... Abstract The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the ...
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Equipment and ore samples. A jaw crusher, a roll crusher, ... The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be ...
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Example Problem on Bonds Crushing Law and Work Index. What is the power required to crush 100 ton/h of limestone if 80 percent of the feed passes a 2-in. screen and 80 percent of the product a -in. screen. work index …
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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 Work Index Tester
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The method selection depends on the crushing/grinding stage (the power size and the necessary finished class). The crushing work index ( CWi ) is an indicator characterizing the energy amount (kW * h / t) needed to destroy …
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It is not recommended to use UCS as a proxy for the Bond crushing work index, or vice versa. If you insist on doing so, there are several potential regression equations above that you may choose ...
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Crushing mill work index is used in the SAGMILLING Bond/Barratt specific energy consumption model. The work index is used to calculate the energy requirement to break …
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Work index is the relation between the SEC and the amount of breakage in an ore. The most common form of this relationship is given as Equation 1, and is often referred to as "Bond's …
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Bond Work Index testing equipment and methods are also provided. The next steps are: (1) to establish standard reference testing materials and one or more laboratories toserve as bases for reference testing; (2) to establish the accuracy of relative circuit Work Index Efficiency determinations; and (3), to develop and provide a public data base ...
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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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Based on Bond's Crushing Law, the power required to crush a certain material will change by _____ if the diameter of the product is made smaller by 50% a. 50% b. 41% c. 25% d. 75% 0.87 Sphericity for a cylinder whose length equals its diameter is a. 1.5 b. 0.5 c. 0.87 d. 5
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Bond Tests. The most widely used parameter to measure ore hardness is the Bond work index Wi.Calculations involving Bond's work index are generally divided into steps with a different Wi determination for each size class. The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi C, …
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Crushing and grindability are the parameters that characterize the resistance of raw materials to crushing. There are several procedures for determining the brittleness and grindability, and in practice, the most widely used methods are F. C. Bond (Bond, 1961).Bond's method continues to receive much attention on an industrial scale because of its pragmatism …
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Bond Work Index in different mass propor-tions. He found out that these values are always lower than the Bond Index obtained as the mean calculated Bond work index value of mixture components by their mass portion. Ipek et al. (2005) have carried out the Bond work index measurements by the
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