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CRUSHING •Bond terms Ei the work index, and expresses it as the amount of energy required to reduce unit mass of material from an infinite particle size to a size L2 of 100 μm. Laws Postulation Equations Feed size 1. Rittinger's Law (1867) Grinding work is related to the new surface generated 𝑾= 𝒙𝒑 − 𝒙 Fine grinding (<0.05mm) 2.
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Title: Bond F.C., 1961. Crushing and Grinding Calculations.pdf Author: can Created Date: 4/2/2009 4:00:03 PM
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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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Chapter 3 - Particle Technology (Size Reduction) Kick's law: the work required for crushing a given mass of material is constant for the same reduction ratio, ... 3.2.2 Bond crushing law and work index.
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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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First Online: 20 July 2023. 1 Accesses. Download reference work entry PDF. Work index indicates the difficulty of ore crushing or ore grinding in mineral processing operation. …
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Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users are often not aware of the nuances of the work index family: what …
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Crushing Law And Work Index - greenrevolution.in. bonds crushing law and work index. 20131254 epeat steps 2 and 3 heory and Analysis The minimum energy required for crushing of the sample is smaller than it onds law is …
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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 work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. ... "Crushing a nd Grinding ...
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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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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: …
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Subsequent studies explained that the three laws derive from a generalized comminution differential equation, each one best applied to a different size range …
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You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 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=. There are 2 steps to solve this one.
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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 primary crushing). The novelty in the third law's proposal was the procedure for determining w i in the case of crushing, rod milling ...
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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' 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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A feed of gypsum with 80% of material passing through a 85 mm screen is washed to a product of 7 mm screen. If the power required for crushing the material is 72 kW, what is the capacity of the crushing unit using Bond's Law? Work index for gypsum is 6.73kWh/t.
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A Methodolog y to Estimate Ores Work Index Values, Using Miduk Copper. Mine Sample. M. Noaparast1*, S. Rahmati1, G. Jozanikohan1, S. Aslani1and A. Ghorbani1. 1 School of Mining Engineering ...
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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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Equation (11.2) is a statement of Kick's Law. It implies that the specific energy required to crush a material, for example from 10cm down to 5cm, is the same as the energy required to crush the same material from 5mm to 2.5 mm. Rittinger, on the other hand, assumed that the energy required for size reduction is directly
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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 ...
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Rittinger's theory and law of the energy expended in crushing of rock is that the work of crushing is proportional to the reduction in diameter; or, as I have more fully expressed it: "The work done in crushing is proportional to the surface exposed by the operation; or, better expressed for this purpose, the work done on a given mass of ...
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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 when sizing crushers*. It is also used to determine the required open-side settings ( jaw crushers and gyratory …
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Abstract. 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 ...
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The metal Bond ball mill is 30.5 cm inside diameter and. 30.5 cm inside length, with rounded corners. It is smooth except for the door hole used for charging. The grinding charge consists of 285 iron or steel balls (43 @ 36.8 mm diameter, 67 @ 29.7 mm diameter, 10 @. 25.4 mm diameter, 71 @ 19.1 mm diameter, and 94 @.
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The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index ...
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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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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 …
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law for fine grinding; Bond's law for coarse grinding and secondary/tertiary crushing; and Kick's law for primary crushing). The novelty in the third law's proposal was the procedure for determining w i in the case of crushing, rod milling and ball milling [13,15]. The practical interest of w i is unquestionable. From a technical ...
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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. Contact us, w e will do the calculations ...
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The crusher has a feed opening gap of 25 mm, a stroke of 4.9 mm, a cone angle of 44o (in relation to horizontal) and a mantle length of 150 mm. A constant closed-side setting of 7.6 mm was used in ...
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and Kick's law for primary crushing). ... The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this ...
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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. Coupled with the ...
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Bong's Work Index is used in Bong's law of comminution energy. It states that the total work useful in breakage is inversely proportional to the length of the formed crack tips …
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