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Work Index, Work Index Efficiency, Bond Work Index testing 4.INTRODUCTION AND BACKGROUND The Bond method allows for quantification and com-parison of relative energy efficiencies of most industrial comminution circuits. It is an essential tool for managing the important business (cost) of grinding. For early analyses of plant grinding efficiency issues, see Bond (1957, 1960). 5.SCOPE This Bond
Get PriceBond Work Index efficiency has been widely used by industry, but until now without concise standard methods, or a formal guideline, for doing so. The Bond Efficiency SubCommittee of - the Industrial Comminution Efficiency work group of GMSG has produced such a guideline, which follows. It covers the methods and provides examples of how to calculate the Bond Work Index Efficiency of most
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Get PriceBond ball mill work index; Bond rod mill work index; Bond crushing (low-energy impact) work index ; Required parameters. F 80, µm is the 80% passing size of the fresh feed to the circuit (expected to be a Bond-compatible size distribution). P 80, µm is the 80% passing size of the circuit product (expected to be a Bond-compatible size distribution). Availability, expressed as a decimal (0.90
Get PriceCorrection of Bond Ball Mill Work Index Test for Closing Mesh Sizes Spreadsheet calculation that fits the Rosin Rammler equation to a set of particle size data consisti ng of an a [↓ read more ↓] Alex Doll: modelling: Fitting a Rosin Rammler equation to a 2-value data set [] Calculation provides a quick way to estimate the Rosin Rammler equation parameters by using two data valu es
Get Pricemicrometers in size. According to the Bond standard procedure, the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250% circulating load (Bond, 1949, 1952, 1961). The test is performed on a raw material approximately weighing 10 kg, which coarseness is -3.327 mm.
Get PriceWhat is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: You can read all the details of this now "Biblical" grinding power requirement calculation formula in Fred Bond's original paper. You can also review the step-by-step Bond Work Index Test Procedure I posted here. See this useful summary Table of Bond Work Index by Minerals. For any circuit
Get Price• The Bond Standard WI Efficiency of this circuit = 84%. This circuit has an efficiency of 84% compared to the Bond Standard circuit efficiency of . • 1/84% = 1.2 This circuit is using 1.2 x more energy than the Bond Standard circuit. 12 2/20/2014 7
Get Price2017-09-13· In grinding, operating Efficiency compares the operating work index of a comminution machine to the Bond work index from bench scale crushing and grindability tests or/and pilot plant tests. Economic Efficiency is comparing the income from production to the planned income from production. Energy as consumed in comminution machines and the required energy as determined, from bench
Get Pricehow to calculate crusher work index. Bond Ball Mill Index - JKTech A Bond Ball Mill Index Test (BBMWI) is a standard test for determining the Ball Mill Work Index of a sample of ore. Read more. procedure for bond work index calculation . The equation used to calculate the Work Index for the above mill containing to determine the Bond Work Index The Bond Rod Mill Work Index Test and
Get PriceThe basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed
Get PriceThe Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm.
Get Price2016-12-12· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size
Get Pricerod mill work index has not been de ned as yet. The ball ﬁ mill work index is con rmed at 16 kWh/t. The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency. This raises the point that, in some cases, the Bond EF4 oversize factor calculation
Get PriceThe Bond Abrasion Index is a measure of how readily a rock sample will wear away steel that comes into contact with it. It is conventionally used to estimate the liner and media wear rate in rod mills, ball mills and crushers. This is a batch test and returns a result in units of grams (the amount of metal that wears off the test coupon). Sample Requirements. The minimum sample consists of 2
Get PriceUsing the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout and production capacity. In order to perform the Bond Index Test successfully it is necessary to use pre-crushed sample material as defined below: Module Ball Mill. Minerals pre-crushed to < 3.35 mm and sieved
Get Price2016-12-12· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size
Get PriceBond for 50 mm > d > 0.05 mm = W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers; F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles. [citation needed] But note that the term 'rod mill' is also used
Get PriceFigure 8.3 Simplified calculation of the torque required to turn a mill. RI FULWLFDO VSHHG 3RZHU Figure 8.4 The effect of mill speed on the power drawn by a rotating mill. The liner profile and the stickiness of the pulp in the mill can have a significant effect on the actual critical velocity. Mills usually operate in the range 65 - 82% of
Get Price1989-01-01· Calculation of energy required for grinding in a ball mill. Int. J. Miner. Process., 25: 41-46. The Bond work index, Wi, as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product. Therefore, in practice we can expect some difficulties and errors when the
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