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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Pug mill; Mullermixer; None of these; View answer. Correct answer: (B) Pug mill. 384. Which of the following comes in the category of primary crusher for hard and tough stone? ... Bond's crushing law; Kick's law; Rittinger's law; None of these; View answer. Correct answer: (C) Rittinger's law. 388.
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Bond's law has been found to apply well to a variety of materials undergoing coarse, intermediate and fine grinding. SizeReduction Equipment a) Roller mill A common type of roller mill consists of two cylindrical steel rolls, mounted on horizontal axes and rotating towards each other.
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A material consisting originally of 20 mm particle crushed to an average size of 5 mm and required 30 kJ/kg for this size reduction. Determine the energy required to crush the material from 20 mm to 3 mm assuming (a) Rittinger's law, (b) Kick's law and (c) Bond's Law. Solution: (a) Applying Rittinger's law as expressed by equation ()
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Bond's law • The work required to form particles of size Dp from very large feed is proportional to the ... • Speed of crushing ranges between 125 to 425 gyrations per minute ... • Material is fed between the plates and is reduced by crushing and shear • Mills with different patterns of grooves, corrugations on the plates perform a ...
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the range of crushing is the range of basic law of Kick. The slope of cumulative curve varies from m = 0 to m the range of coarse grinding is the range of Bond's theory, (rn = — ) and the range of fine grinding is the range of Rittinger's theory ( m = — ). the range of fine grinding from m = —1 to — 3,
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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 product particles. Bond's Law can be written as: E = E i (100/L 2) 1/2 [1 (1/q 1/2 )]
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It is important to know that a "Bond" rod mill work index is performed in a laboratory mill with wave liners, as in the photo. ... Crushing work index. The Bond lowenergy impact crushing work ...
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2 states that the energy required for crushing is. Doc Preview. Pages 100+ Identified QAs 100+ Solutions available. Total views 100+ Technological Institute of the Philippines. GEC . GEC 008. cruzdiane00. 2/16/2021. (13)
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and Kick's law for primary crushing). The novelty in the third law's proposal was the. ... the variability of wi when performing the ball mill Bond's standard test is not always understood ...
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47 Ma ximum size reduction in a ball mill is done by the, _____ action. Impact Attrition Compression cutting 48 Bond crushing law calls for relatively less energy for the smaller product particles, than does the Rittinger law is less realistic in estimating the power requirements of commercial crushers.
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Test work has indicated that by crushing the feed to 80% passing 5 mesh and grinding in a ball mill to 80% passing 400 mesh, recoveries will be satisfactory. Using the Bond equation, compute the energy required to grind two tons of this ore. Refer to the following table for mesh aperture sizes in micrometers.
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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. ... Wheat is milled at a rate of 5 tonnes/h, and the power required for this operation is 40 kW. Assuming Bond ...
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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 rock is proportional to the reciprocal of the ...
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The most common form of this relationship is given as Equation 1, and is often referred to as "Bond's equation" or "Bond's law." E=10× √P − √ F 80 80 ) ( 1 ) Where: E is the specific energy consumption in kWh/t Wi is the work index (see discussion below for the units of this quantity)
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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. yields very fine products.
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Discusses the three laws of comminution, namely the Rittinger's law, the Kick's law and the Bond's law, and the general formulation by Walker et al. Also dis...
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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, ... Bond crushing law and work index.
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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 . mm). Determine the starting ...
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Title: Bond, 1961. Crushing and Grinding Author: can Created Date: 4/2/2009 4:00:03 PM
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For ball mills, which are usually used at particle sizes intermediate of those found in fine grinding processes and crushing processes, Bond's Law is usually used [63]: (9) E = 10 W i 1 x p − 1 x f where W i is the Bond Work Index. The particle sizes in Bond's Law are almost always defined as 80% passing F 80 (feed) and P 80 (product) values ...
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where Wi is the Bond Work Index, again in energy per unit mass 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: 2000 lbs or 907 kg, roughly follow the Moh's scale of hardness, see Table
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•More accurate than Rittingers law for course crushing. •Applicable for feed size greater than 50mm ... •Kick's Law n=1 •Bonds law n= •Particles of average feed size 50 x 10(4) m are crushed to an average ... At this rate, the crusher consumes 40 kW of power of which 5 kW are required for running the mill empty. Calculate the ...
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Kick's Law. The final theory of particle reduction is Bond's Law that states the total work input by the weight of crushed material is inversely proportional to the square root of the diameter of the product particles (Figure 7). Bond's Law functions best in between the coarse grinding of Bond's Law and the fine grinding of Rittinger ...
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Bond's law, which assumes that the total work useful in breakage is inversely proportional to the square root of the diameter of the product particles, [implying] theoretically that the work input varies as the length of the new cracks made in breakage. [6] [7]
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For example, for a sample with 20% of 300 μm material in the feed, if this is not scalped out of the fresh feed, then the mill charge, at 250% circulating load will contain / or % of 300 μm in the mill charge compared with 0% for a scalped fresh feed, at a closing screen of 300 μm.
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It is a wellknown 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 size did not show a clear ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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