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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

Morebonds 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 terms of the work index

More116 Crushing and classification ∝ − 3 i 5/2 i 3 f 5/2 f x x x E giving = − f i 10 10 x x E W i (11.5) 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

MoreThe Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per revolution, G, and

MoreI have a question about CWi calculation.We have an existing plant and I want to calculate the CWi based on Bond formulation and compare it with lab tests results.At the existing plant the data are:F80= 370mmP80= 10mmSpecific energy is 1,8 Kwh/tWhen we apply the

MoreThe 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.

MoreThe 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

MoreThis Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’. You can find the SG of each mineral samples on the other table.

MoreMCQs: The work index in Bond’s law for crushing of solids has the following dimensions_____? Chemical Engineering Mcqs Mechanical Operations Mcqs for Chemical

MoreBond Work Index. 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

MoreExercise 1(a) 1) A material consisting originally of 25 mm particle is crushed to an average size of 7 mm and requires 20KJ/kg for this size reduction. 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

MoreThe 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

MoreMay 14, 2010· 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 as the gross energy requirement in kilowatt-hours per ton of feed needed to reduce a very large feed to such a

MoreThe 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

MoreRittinger’s law: work required in crushing is proportional to the new surface created P = power required P m. K r 1 D sb 1 D sa a= feed rate m Ý = volume-surface mean dia. of feed & product, respectively D sa ,D sb K r = Rittinger’s coefficient K r 6e s c m p 1 b 1 = crushing efficiency C = ratio of energy absorbed to energy input m p

MoreJan 01, 2016· Bond’s crushing work index of gypsum. 3.4. A sample of granite passing a 7.5 cm square opening screen was suspended in a Bond’s pendulum test. The length of the pendulum was 413 mm and the mass of hammers is 13.6 kg each. The sample was completely crushed when the initial position of the pendulums made an angle of 30° with the vertical.

More“crushability or grindability”, also cal led work index and the “wear profile”, c alled abrasion index. 4.0 Crushing of rock and minerals : Crushing is the largest process operation in

More1c. Students know how to apply the law F=ma to solve one-dimensional motion problems that involve constant forces (Newton’s second law). H.S. Chemistry . 4c. Students know how to apply the gas laws to relations between the pressure, temperature, and volume of any amount of

More• 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.

MoreOct 10, 2014· • 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, 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, that is q =∞. 7.

MoreChapter 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.

MoreHardgrove index and brittleness test can be carried out easily on only those ores or rocks or materials, which are soft, friable and brittle [1-3]. Indices with which the crushing resistance or the grindability in a wide meaning is expressed include the Rittinger number, crushing resistance, Hardgrove index and Bond work index.

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