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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 ...

Question: Bond crushing lawCalls for relatively less energy for the smaller product particles, than does the Rittinger lawIs less realistic in estimating the power requirements of commercial crushersStates 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 …

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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 ...

Fred Chester Bond Wikipedia Fred Chester Bond (June 10,1899 January 23,1977) was an American mining engineer.A graduate and former professor of the Colorado School of Mines,he worked in the mining equipment and ore milling equipment business of Allis Chalmers from 1930 …. Contribute to dihog/sbm development by creating an account on …

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 …

A quick procedure with two grinding cycles for the determination of the Bond. work index approximate value is exactly the same as in the first two grinding cycles of. the standard Bond test and ...

View full document. • 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%. • In crushing a certain ore, the feed is such 80% is less than 50.8 mm in size and the product size is such that 80% is less than 6.35 mm. The power required is 89.5 kW.

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 ...

Bond Crushing Law In Ball Mill - Mining Machinery proposed by Bond in 1952. Bond postulated that the work required to form particles of size D P from very large feed is proportional to the square root of the surface-to-volume ratio of the product. Bond Crushing Law and Work Index 1 2 Bond proposed the E i as the work index.

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 often written in …

For some comparative benchmarking information look at, Ballantyne, G.R. and Powell, M.S., Benchmarking comminution energy consumption for the processing of copper and gold ores. Minerals Engineering, 65, 2014, 109-114. Benchmarking comminution energy for copper and gold ores. Robert is correct, there are a couple of other frameworks also out …

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 …

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PDF | The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability …

Hence W = constant x P. That is to say, the work done, in crushing a given weight of ore from any one stage to the next, would, from this reasoning, be proportional to the number of particles at the first of these two stages. If this were actually the case, the law deduced would give, with the finer sizes, extremely large work values, even ...

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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. kWh. m 1 / 2 / ton. This question hasn't been solved yet! Not what you're looking for? Submit your question to a subject-matter expert.

The Bond work index ( Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of Rittinger's law. Accordingly, the energy consumed in reducing the particle size from x F to x p (both measured as 80% undersize) is given by.

Chemical Engineering. Chemical Engineering questions and answers. According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively). (S/V)p (S/V)p (S/V)2 p (S/V)f.

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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 ...

Generalized Law : (n 2, 1 and 1.5 for Rittinger's, pp d (Dvs) vs Kik's and Bond's laws respectively) Work Index: the gross energy requirement in kilowatt hour per short-ton of feed (kWh/ton of feed) to reduce a very large particle to such a size that 80% of the product will pass through a 100 gm or 0.1 mm screen. — = 0.3162 w P Upp ] Lipp ]

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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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