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Kick's law p = -2 𝑬= 𝑹 𝒄 − 𝑪= 𝑹 𝒄 Rittinger'slaw p = -3/2 𝑬=𝑪 / − / 𝑪= 𝑬 √ Ei the work index Bond's law 𝑾 𝒓, 𝒄 is the crushing strength of the material and Work index (𝑬 ) is the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um.
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The two earliest laws are due to KICK and VON RITTINGER, and a third law due to BOND has also been proposed. ... Second batch is loaded for grinding and the operation continues. Tumbling mills are used. ... Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . A Bond Ball …
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During manual crushing and disintegration of a rock with a hammer, or during mechanical crushing operations, the size reduction of large sized rocks and ores is mostly by sharp impact action, and less so by the impact and attrition experienced in tumbling mills. The equation used by Bond is inappropriate to determine the energy required for ...
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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 grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills). The relationship between wi and grinding …
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Bond's work index model of quantifying mineral grindability was born out of the desire for a better way of scaling up laboratory grindability test results to industrial-scale grinding …
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See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. See more
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given as Equation 1, and is often referred to as "Bond's equation" or "Bond's law." E=10×Wi(1 √P80 − 1 √F80) ( 1 ) Where: 1. E is the specific energy consumption in kWh/t 2. Wi is the work index (see discussion below for the units of this quantity) 3. P80 is the 80% passing size of the product of the comminution process in µm 4.
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Confusion concerning the so-called general law of grinding proposed by Walker et al. is removed when it is realised that two forms of the law exist, quite different …
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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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For example, in most roller mills compression is the dominant force, impact forces feature strongly in hammer mills and shear forces are dominant in disc attrition ... (see above). Kick's law has been found to apply best to coarse crushing. In Bond's Law, n is given the value 3/2. So: dE/dx ... E = 2 K[ 1/ (x 2) 1/2 - 1/ (x 1) 1/2 ...
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The apparent inefficiency of SAG mills when using Bond analysis is widely understood to be due to the difference in the slopes of the size distributions. ... (GGS) ideal power law size distribution equation was used to test the difference between the three approaches (Bond, Morrell and SSE). ... Bond, F.C., 1961. Crushing and Grinding ...
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1. Compression or crushing disintegation by two rigid forces. - coarse reduction of hard solids to coarse sizes. 2. Impact/hammer single rigid force. - gives coarse, medium or fine sizes. 3. Attrition or rubbing scraping against one another/a rigid surface. - …
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Mills should be sterilized by steam before use. Contamination of milled materials: In case of potent drugs and low dose products, contamination of the products should be avoided. Equipment free from wearing (e.g. fluid energy mill) may be used in this case. Laws governing energy and power requirements of mills
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include Jaw and Cone Crushers. Secondary crushing can be by rotating surfaces such as swing hammer mills, for brittle materials, and roll crushers. Finer grinding usually takes place in rotating vessels, such as ball and rod mills. Very fine grinding, to sizes less than 10 µm, requires high energy and attrition mills are often used. These have
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1885). Later work by Bond yielded an equation relating the energy needed to reduce a material from one characteristic size to a smaller size (each size expressed as the state where 80 percent of the particles are smaller than the characteristic size). Bond's work is notable because of its widespread adoption in the
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Bond crushing law. A. Calls for relatively less energy for the smaller product particles, than does the Rittinger law B. Is less realistic in estimating the power requirements of commercial crushers. C. States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
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5.2.1 Tumbling mills ... Weak bond between the molecules are more prone to get damaged with this force and ... There are two laws define crushing in more prominent by helping us to pre dict the ...
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A better understanding of equipment and operation parameters can minimize the overall input energy. The popular size reduction equipments for agricultural produce, viz., hammer mill, ball mill, burr mill, jaw crusher, gyratory crusher, crushing roll, cutter mill, Reitz mill, and colloid mills, are explained using schematic diagrams.
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ing design inefficiency factors into the reference Bond Stan-dard Circuit, assume 2.44 m diameter overflow mills, and use a rod mill F80 of 16,000 µm and a rod mill P80 of 1,000 µm. Note that—in order for no correction factor for ball mill product fineness to apply—the ball mill circuit P80 should be no less than approximately 70 µm ...
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Abstract. Confusion concerning the so-called general law of grinding proposed by Walker et al. is removed when it is realised that two forms of the law exist, quite different in physical meaning. The Kick and Rittinger laws are special cases of one form, and Bonds law is a special case of the other. Thus it is possible for Rittinger's and Bond ...
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Bond( 1960), in a paper titled "Crushing and grinding calcu lations," identified correction factors that should be applied to the calculated power deter mined using the Bond equa tion. In 1960, the larger rod and ball mills had diameters in the range of3.20 to 3.51 m (l0.5 to 11.5 ft.). However, during the 1960s, the diameters of the mills
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Crushing and grindability are the parameters that characterize the resistance of raw materials to crushing. ... Some authors have proposed new smaller mills that can be used to determine the BWI. ... Bond, F.C., 1961. Crushing and grinding calculation part I and II. Brit. Chem. Eng. 6 (6 and 8). 378–385 & 543–548. ...
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An estimate (using Bonds law) of the energy to grind the particles from a very large size to 50 rn is a) 25.4 kWh/ton b) 6.35 kWh/ton c) 9.0 kWh/ton d) 18 kWh/ton. 4. Size reduction of the _____ can be suitably done by ball mills, crushing rolls and rod mills. a) Non-metallic ores b) Basic slags c) Asbestos & mica d) Metalliferrous ores 5.
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Abstract. The grindability of raw material is generally determined by Bond's standard ball mill grindability test (developed by the Allis Chalmers company). The ball …
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work index approximate value is exactly the same as in the first two grinding cycles of. Prepare a sample, the same as for the standard Bond test (grind to . -3.327 mm). Determine the starting ...
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KK stands for Kick's constant, while fc stands for the material's crushing strength. On integration it gives, Bond Bond has proposed an intermediate path, in which he hypothesizes that n = -3/2, which leads to: Microns are used to measure L.
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Bond's Law, named after the British engineer Robert Bond, states that the energy required to reduce the size of a particle is proportional to the surface area created. This law assumes that the energy required for crushing or grinding a material depends only on its physical properties, such as its size and shape.
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Bond's Law states that the total work input represented by a given weight of crushed product is inversely proportional to the square root of the diameter of the …
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Jaw crusher. Jaw Crusher is used in mining, metallurgy, construction, highway, railway, irrigation and. Chemical industries and jaw crushers have the features of high reduction ratio, even. Powder-sizes, low power consumption and easy maintenance. The crushing strength of. the jaw crusher material is up to 350 Mpa.
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