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The effect of particle size reduction on the burn ability of Limestone was investigated using the limestone obtained from Obajana Cement Mines Limestone samples were grinded and were classified into following particles size distribution 90µm 200µm 250µm and 500µm graduated in

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The same machine is used to crush dolomite at the same output from 6 mm diameter average size to a product consisting of 20 per cent with an average diameter of 0.25 mm 60 per cent with an average diameter of 0.125 mm and a balance having an average diameter of 0.085 mm Estimate the power required assuming that the crushing strength of the

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The experimental mill used was a laboratory size of 209 mm diameter 175 mm length providing a total mill volume of 6001 cm3 with a total mass of 5.6 kg of steel balls of 46 26 and 12.8 mm

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Equations 4 and 6 were respectively called Rittinger and Kick s laws Supposes that the energy required is directly related to the reduction ratio L 1 /L 2 which means that the energy required crushing a given amount of material from a 50 mm to a 25 mm size is the same as that required reducing the size from 12 mm to 6 mm In equations above KR and KK are known respectively as Rittinger s

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Jul 12 2012 b 3 kW has to be supplied to a machine crushing a material at a rate of 0.3 kg/s from 12.5 mm cubes to a product having the following sizes 80 3.175 mm 10 2.5 mm 10 2.25 mm

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Jan 01 2016 The first used Bond s pendulum method the second Narayanan and Whiten s method In both cases the mean particle size of feed was 12.5 mm Indicate the height to which the pendulum has to be raised in order to give the same work index Data feed size = 11.2 mm product size = 1200 μm S.G of ore = 2.65

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Jan 01 2018 A particle diameter of 15 mm is chosen for the single particle impact crushing experiment performed at different impact velocities The real crushing ratio i is the ratio of the arithmetic mean particle size D b.M of the particles before crushing to the arithmetic mean particle size d b.M of the particles after crushing.

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Feb 27 2021 2.5 A crushing mill which reduces limestone from a mean particle size of 45 mm to the following product Size mm Amount of product per cent requires 21 kJ/kg of material crushed Calculate the power required to crush the same material at the same rate from a feed having a mean size of 25 mm to a product with a mean size of 1 mm 2.6.

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PROBLEM 1.3 The fineness characteristic of a powder on a cumulative basis is represented by a straight line from the origin to 100 per cent undersize at a particle size of 50 µ m If the powder is initially dispersed uniformly in a column of liquid calculate the proportion by mass which remains in suspension in the time from commencement of settling to that at which a 40 µ m particle falls

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Nov 01 2018 A particle diameter of 15 mm is chosen for the single particle impact crushing experiment performed at different impact velocities The real crushing ratio i is the ratio of the arithmetic mean particle size of the particles before crushing to the arithmetic mean particle size of the particles after crushing The formula is as follows

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For the purposes of calculation a mean value of 4.0 mm will be used which agrees with the value obtained by Bond s method For coarse crushing Kick s law may be used as follows Case 1 mean diameter of feed = 45 mm mean diameter of product = 4 mm energy consumption = 13.0 kJ/kg compressive strength = 22.5 N/m2 In equation 2.4 13.0

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2.5 A crushing mill which reduces limestone from a mean particle size of 45 mm to the following product Size mm Amount of product per cent 12.5 7.5 5.0 2.5 1.5 0.75 0.40 0.20 0.5 7.5 45.0 19.0 16.0 8.0 3.0 1.0 requires 21 kJ/kg of material crushed Calculate the power required to crush the same material at the same rate from a feed

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Jul 20 2007 A total of 62 particle size differential distributions at different stages of the 8 grinding experiments were examined The average of the correlation coefficients between particle size distribution measurements and the simulation computations was r = 0.979 max 0.997 and min 0.924 Examining the same particle size distributions as cumulative

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Qn.5 A crushing mill reduces limestone from a mean particle size of 45 mm to a product of mean particle size 7.78 mm and in so doing requires 21 kJ/kg of material crushed Calculate the power required to crush the same material at the same rate from a feed having a mean size of 25 mm to a product with a mean size of 1.0 mm i assuming

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A crushing mill reduces limestone from a mean particle size of 45 mm to the following product It requires 21 kJ/kg of material crushed Calculate the power required to crush the same material at the same rate from a feed having a mean size of 25 mm to a product with a mean size of 1 mm.

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Sep 21 2019 The screen analysis of the product was What power would be required to crush 1 kg/s of a material of compressive strength 45 MN/m2 from a feed of minus 45 mm plus 40 mm to a product of 0.50 mm average size 55 Solution A dimension representing the mean size of the product is

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Case 1 mean diameter of feed = 45 mm mean diameter of product = 4 mm energy consumption = 13.0 kJ/kg compressive strength = 22 .5 N/m2 In equation 2.4 13.0 = KK 22 .5 ln 45 4 KK = 13.0 /54 .4 = 0.239 kW kg/s MN/m2 and Case 2 mean diameter of feed = 42 .5 mm mean diameter of product = 0 .50 mm compressive strength = 45 MN/m2

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A crushing mill reduces limestone from a mean particle size of 45 mm to the following product It requires 21 kJ/kg of material crushed Calculate the power required to crush the same material at the same rate from a feed having a mean size of 25 mm to a product with a mean size of 1 mm.

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The particle size distribution PSD of a powder or granular material or particles dispersed in fluid is a list of values or a mathematical function that defines the relative amount typically by mass of particles present according to size Significant energy is usually required to disintegrate soil etc particles into the PSD that is then called a grain size distribution.

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Dec 12 2018 As crushing is the last chain of interrelated subsystems affected by mean fragmentation size it should be included in the cost analysis Crusher cost varies with the particle size of the feed The crushing cost is calculated based on specific energy The energy requirement increases when the particle size of the material increases.

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