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Bond has proposed a law intermediate between Rittinger's and Kick's law for estimating the power required for crushing and grinding operations. It states that the work required …
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Kick's law is more suitable where coarser grinding takes place. This particular equation is valid for bigger particle size, for example, size reduction from 12 cm to 6 cm or from 6 cm to 3 cm. 6.6.3 Bond's Law. This law was developed by the Fred Chester Bond, an American mining engineer in 1952.
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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.
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This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Explain in detail Von Rittenger's law. Kick's law and Bond's law of crushing process. 6M.
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Mechanical Operations Bond crushing law 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 ratio of the product States that the work required for the crushing is proportional to the new surface created ...
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Bond's work index is obtained from laboratory crushing tests on the feed material. Bond's law holds reasonably well for a variety of materials undergoing coarse, …
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• 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 ...
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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.m1 2/ton kWh. m 1 2 / ton. Answer: Option B. This Question Belongs to Chemical Engineering >> Mechanical Operations.
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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.; Use …
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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. ... Estimate the power required (Kick's law) to crush the same limestone having a mean size of 2 mm. Assume all material charged had to be crushed.
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Political Science. Pharmacy. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the a) Feed material b) Type of crushing machine c) Both A & B d) Neither A nor B.
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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 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 crushers and gyratory crushers) or closed-side settings (cone crushers) for a given product size.P80 = 25400 x …
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For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test. See more
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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: i.e. 2000 lbs or 907 kg, roughly follow the Moh's scale of hardness, see Table 11.1. In Summary, Kick's law is better for larger particles and Rittinger's
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A feed of gypsum with 80% of material passing through a 85 mm screen is washed to a product of 7 mm screen. If the power required for crushing the material is 72 kW, what is the capacity of the crushing unit using Bond's Law? Work index for gypsum is 6.73kWh/t.
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CE 161P. • 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.
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given as Equation 1, and is often referred to as "Bond's equation" or "Bond's law." E=10×Wi(1 √P80 − 1 √F80) ( 1 ) Where: 1. E is the specific energy consumption in kWh/t 2. Wi is the work index (see discussion below for the units of this quantity) 3. P80 is the 80% passing size of the product of the comminution process in µm 4.
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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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Most popular comminution laws are those proposed by Kick, Rittinger and Bond. Kick's Law (1885): Kick's law that can be applied to crushing states that "the work required for crushing a given quantity of …
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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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GRINDING LAWS The three laws of Rittinger, Kick and Bond can all be derived from the follow- ing relationship, proposed by Charles (1957), between energy consumed and mate- rial size C.51 : &=-kg Yn Setting the exponent n to 1, 11 or 2 upon integration defines the laws of Kick, Bond and Rittinger respectively.
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Von Rittinger's law (1867): It states that the energy consumed in the size reduction is proportional to the area of new surface generated. putting p = −2, then integration gives: Writing C = KRfc. fc is the crushing strength of the material.L2 & L1 are the final and initial particle sizes.KR is the Rittinger's constant.
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Explanation: The formula above represents the Kick's law, where P is the power required, m is the mass and D sa /D ab is the reduction ratio and Kk is the kick's constant. 9. Kick's law holds well for ____
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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 power required using the same feed so that 80% is less than 3.18 mm is roughly around . Assume that Bond's Law applies.
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Kick's law has been found to hold more accurately for coarser crushing, where most of the energy is used to cause fracture along existing cracks. 2.3 Bond's Law and Work Index A third version of the comminution law is the one attributed to Bond ( 1963 ), who considered that the work necessary for reduction is inversely proportional to the ...
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Equation (11.2) is a statement of Kick's Law. It implies that the specific energy required to crush a material, for example from 10cm down to 5cm, is the same as the energy …
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Contribute to lbsid/en development by creating an account on GitHub.
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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 …
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Compressive forces are generally used for the coarse crushing of hard materials. Careful application of compressive forces enables control to be exercised over the breakdown of the material, e.g. to crack open grains of wheat to facilitate separation of the endosperm from the Bran. ... Bond's law has been found to apply well to a variety of ...
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All three theories can be applied for a certain range of particle size: Kick's Law for coarse size particles (for crushing), Bond's Law for medium size particles, and …
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Agriculture. Sociology. Political Science. Pharmacy. Which of the following crushing laws is most accurately applicable to the fine grinding of materials ? a) Bond's crushing law b) Kick's law c) Rittinger's law d) None of these.
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Step 1. The constants (Kb, Kr, and Kk) used in the laws of crushing (Bond's law, Rittinger's law, and Kick's law) depend upon the feed material type but not specifically on the type of crushing machine. These laws describe the relationships between the energy input and the size reduction of particles in crushing processes:
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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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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.
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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% a. 50% b. 41% c. 25% d. 75% 0.87 Sphericity for a cylinder whose length equals its diameter is a. 1.5 b. 0.5 c. 0.87 d. 5
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