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bonds crushing law and work index

Bond Work Index - an overview ScienceDirect Topics

The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 ... 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% ...

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Bond Impact Crushing Work Index -Procedure and Table of ...

16/06/2015  Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond’s Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product – the feed.

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Testwork: Bond crushing work index - SAGMILLING.COM

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 specimens are chosen to represent a sample and the ...

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Chemical Engineering Stop: Bond’s law

14/05/2010  Bond postulated that 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, Sp/Vp. By relation Sp/Vp = 6/ɸsDp, from which it follows that . P/ ṁ = Kb/(Dp)^0.5. Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is defined ...

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Fred Chester Bond - Wikipedia

In the 1930s through early 1950s, Bond developed a new theory of comminution that introduced an index, called the 'Bond Work Index', which relates power consumption in crushing and grinding to the feed and product size distribution. His theory and index were introduced in a widely cited 1952 journal article. Bond called his theory the "third theory of comminution", counting those of Peter von Rittingerand Friedrich Kick as the first and second. This term and the terminology of "laws of comminution", as in "Rittinger's law", "

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Chemical Engineering Stop: Bond’s law

14/05/2010  Bond postulated that 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, Sp/Vp. By relation Sp/Vp = 6/ɸsDp, from which it follows that . P/ ṁ = Kb/(Dp)^0.5. Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is defined ...

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The work index in Bond's law for crushing of solids has

The work index in Bond's law for crushing of solids has the following dimensions a) No units (dimensionless) b) KWh/ton c) KW/ton d) KWh.m 1/2 /ton

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(PDF) A quick method for bond work index approximate

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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CORRELATION BETWEEN BOND WORK INDEX AND

The Bond work index is regarded as one of the crushing resistance; it can therefore be presumed that the Bond work index is correlated to the mechanical properties of materials [4]. Literature review on impact crusher performance in relation to machine configuration and operational conditions, by experimental work and mathematical modeling is given by studied rock failure under tensile stress ...

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CPE: Lesson 15. Empirical laws of Size Reduction

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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Comparison of UCS to Bond Work Indices

FIGURE 2: BOND CRUSHING WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH (ordered by mine) 0 100 200 300 400 UCS, MPa 0 10 20 30 40 50 60 WiC (metric) Aus Aus Africa S.America Aus S.America Africa Africa S.America Aus Africa S.America Figure 2 displays the global data separated by mine. Most of the mines examined do not have a significant correlation between Wi C and UCS. Many

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Bond Tests SGS

* Bond F. C., “Crushing Grinding Calculations”, Reprint from British Chemical Engineering, Allis-Chalmers Publication 07R9235B. Bond Low Energy Impact Test. 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 ...

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Based on Bonds Crushing Law the power required to

• 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. Use the Bond equation. The power required using the same feed so that ...

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Chemical Engineering Stop: Rittinger’s and Kick’s laws

14/05/2010  Rittinger's law states that work required in crushing is proportional to the new surface created. In other words, crushing efficiency is constant and for a given machine and feed material is independent of the sizes of feed and product. Rittinger’s law is written as- P/ ṁ = Kr(1/Dsb – 1/Dsa) Kick proposed another law based on stress analysis of plastic deformation within the elastic ...

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CPE: Lesson 15. Empirical laws of Size Reduction

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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Comparison of UCS to Bond Work Indices

FIGURE 2: BOND CRUSHING WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH (ordered by mine) 0 100 200 300 400 UCS, MPa 0 10 20 30 40 50 60 WiC (metric) Aus Aus Africa S.America Aus S.America Africa Africa S.America Aus Africa S.America Figure 2 displays the global data separated by mine. Most of the mines examined do not have a significant correlation between Wi C and UCS. Many

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Comparison between bond crushing energy and fracture ...

the Bond index. There is considerable difference between Bond crushing energy and work done by the jaw crusher for rocks. It appears that the Bond approach is not a suitable method for predicting single particle fracture energy done by the crusher. To verify the results obtained from DEM models, the fracture behaviour of the crushed rocks was examined and was compared to the PFC3D results. The ...

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Kicks LawIt state that the work required for crushing a ...

Determine the energy required to crush the material from 25 mm to 3.5 mm. Assuming: a) Ritttingers law b) Kicks law c) Bond law 2) A material is crushed in a blake jaw crusher such that the average size of particle is reduced from 50 mm to 10mm with the consumption of energy 13.0KW/(kg/s).What could be the consumption of energy needed to crush the same material of average size 75 mm to an ...

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Operating work index is not the specific energy

24/10/2018  The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of

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Based on Bonds Crushing Law the power required to

• 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. Use the Bond equation. The power required using the same feed so that ...

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According to Bond crushing law the work required to

According to Bond crushing law the work required to form particle... Home / Chemical Engineering / Mechanical Operations / Question. Examveda . 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). A. (S/V) p. B. √(S/V) p. C. (S/V)² p. D. (S/V) f ...

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Chemical Engineering Stop: Rittinger’s and Kick’s laws

14/05/2010  Rittinger's law states that work required in crushing is proportional to the new surface created. In other words, crushing efficiency is constant and for a given machine and feed material is independent of the sizes of feed and product. Rittinger’s law is written as- P/ ṁ = Kr(1/Dsb – 1/Dsa) Kick proposed another law based on stress analysis of plastic deformation within the elastic ...

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Premium Bonds - NSI

22/11/2020  Premium Bonds can make a special gift for a child under 16. Until the child’s 16th birthday, the parent or guardian named on the application looks after the Bonds, regardless of who bought them. We’ll send confirmation of any transactions made, prizes won and payment for cashed-in Bonds to the nominated parent or guardian until the child is 16.

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