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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Kick's law is more accurate than Rittinger's law for coarse crushing where the amount Of surface produced is considerably less. 2.3.3 Bond's Law and Work Index Bond has proposed a law intermediate between Rittinger's and Kick's law for estimating the power required for crushing and grinding operations.
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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 1 √Dp √ Df ... • Speed of crushing ranges between 125 to 425 gyrations per minute
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The paper examines the determination of the bond work index (BWI) on finer samples and proposes an equation for the BWI on finer samples. The BWI is a method …
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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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According to Rittingers law, work required is proportional to _____ a) Energy Consumed b) Surface area created ... Following Rittingers law, Crushing efficiency is ____ a) Independent of feed material b) Independent of size of feed and product ... Bond's ratio View Answer. Answer: b
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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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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
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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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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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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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I happen to be one of those who believe that Rittinger probably meant what he said when he wrote what Stadler has quoted, "the increase of the surfaces exposed is directly proportional to the force required for reducing" "and therefore also to the work absorbed in effecting the separations." (The italics are now mine instead ...
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 participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN; Use Add New Topic to ask a New Question/Discussion about Crushing.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.; …
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Bond's Law: The work required to form particles from very large feed is proportional to the square root of the surface-to-volume ratio. E = K B f c [(1/L 2 ) 1/2 - (1/L 1 ) 1/2 ] Rittinger's Law — The energy required for reduction in particle size of a solid is directly proportional to the increase in surface area.
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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 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. ... Bond, F.C., 1961. Crushing and grinding calculation part I and II. Brit. Chem. Eng. 6 (6 and 8). 378–385 & 543–548. Google Scholar. Chandar et al., 2016. R.K ...
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LAWS The three laws of Rittinger, ing relationship, rial size C.51 proposed Kick and Bond can all be derived by Charles (1957), between energy from the follow- consumed and mate- : &=-kg Yn Setting the exponent Bond and Rittinger n to 1, 11 or 2 upon integration mined third law of comminution as a result of the Bond Work Index Wi.
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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 pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock pieces.
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BOND, F.C., 1961. Crushing and grinding calculations. Allis Chalmers Publications, No. 07R9235B. ... The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to ...
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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: i.e. 2000 lbs or 907 kg, roughly follow the Moh's scale of hardness, see Table 11.1.
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Answer to Solved According to Bond crushing law, the work required to | Chegg
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bonds formula for cement crushing in ball mill – Crusher South Africa. Bond F.C., … COMMINUTION theory is concerned with the … F. C. Bond, "The Third Theory …
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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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Learn how to measure the crushability of rock samples using the Bond Impact Crushing Work Index test, a standard method based on the third theory of comminution. Find the formula, the test procedure, and a table of reference values for …
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Where: E=Energy, K K =Kick's Constant, f c =crushing strength of the material, L 1 =initial length, and L 2 =reduced length. 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:
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The Bond crushing work index test (sometimes called the "impact work index" test) is noisy, and the difference you observed is perfectly reasonable. The paper by Angove & Dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5. The laboratory CWi value of 27.4 (metric) is almost within 4.5 units of the ...
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Learn what Bond's work index is and how it relates to mineral grindability, specific energy consumption and power models. Find out the differences between laboratory, operating …
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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 mills (Lynch & Rowland, 2005). ... given as Equation 1, and is often referred to as "Bond's equation" or "Bond's law." ...
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12 Bond has suggested a law intermediate between Rittinger's and Kick's laws, by putting p = −3/2 in the general equation: Writing C = 5Ei then: Bond terms Ei the work index, L is measured in microns, 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.
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BOND WORK INDEX. The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where. W= the energy input (Work input) per ton, kwh/metric ton. WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore)
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In case of crushing a classical law known as Kick's law is best suited: P = 𝑚̇𝐾 log 𝐴𝑤2 𝐴𝑤1 (4.4) A more useful relation that can be used for both crushing and grinding has been obtained by Bond (1952). This law introduces two new concepts namely, "The Bond diameter, D
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The median Bond ball mill work index and Bond rod mill work index will be similar for most projects, thought significant variation can manifest for any one particular sample. Relation of Bond ball mill work index and crushing work index. Rarely is there a relationship between the Bond ball mill work index and the Bond crushing (impact) …
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