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 m hence the 10 inside the brackets Bonds Work Index values in kWh per short ton ie 2000 lbs or 907 kg roughly follow the Mohs scale of hardness see Table 111
The Bond crushing work index has very poor precision which may result in extremely large differences between labs treating the same material Angove and Dunne1997 Angove and Dunne reported that for some samples the coefficient of variation standard deviationmean was as high as 435 being a
The Bond crushing work index test sometimes called the impact work index test is noisy and the difference you observed is perfectly reasonable The paper by Angove amp Dunne 1997 reports a standard deviation in crushing work index tests across laboratories as 45
The test is a perspecimen test where individual specimens of prepared rock are handpicked by the test operator and placed into the apparatusBond Work Index For Crushing Coal Delumper75 Lp Crusher A Bond Ball Mill Work Index test is a standard test for determining the ball mill index of a sample of ore It was developed by Fred Bond in 1952
The Crusher Work Index in kWhton is a function of the materials impact strength and is defined by an argillite type of rock which has a work index of 165 bond crushing work index equipment
Bond Work Index For Coal In Crusher Values Of Bond Crushing Work Index Will Vary From A 8 KwhT For Laterite Hardcap Through To 22 KwhT For Banded Iron Formation To 46 KwhT For Fresh Greenstone Fred Chester Bond Wikipedia The Free Encyclopedia Fred Chester Bond June 10 1899 January 23 1977 Was An American Mining Engineer
Wic Bond Impact Crushing Test Work Index kWht WioACT Actual Operating Bond Work Index determined from measurements on the circuit kWht WiRM Bond Rod Mill Test Work Index kWht WiSTD Standard Circuit Bond Work Index expected or designed used for circuit design Specific energy requirement at the drive pinions 3KEYWORDS Work Index
Ball Mill Costing Calculation Prompt Caesar is a famous mining equipment manufacturer wellknown both at home and abroad major in producing stone crushing equipment mineral separation equipment limestone grinding equipment etc ball mill design calculator Description Bond Ball Mill Index JKTech A Bond Ball Mill Work Index test may
Work Index is the amount of energy required to do this work It is a measurement of how hard the rock is and an expression of the resistance that a material has to crusher Shown in the table below is typical Work Index reflecting the different rock characteristics
Apr 23 2020nbsp018332the bond work index of the rock this number will be used to calculate the power required to produce the final product calcpower usedpower calc the calculated power to produce the crusher product power 100 sq bwi 10sqrtp 80 10sqrtf 80 where sq is the solid mass flowrate bwi is the bond work index p80 and f80 are in m
The most widely used parameter to measure ore hardness is the Bond work index Wi Calculations involving Bonds work index are generally divided into steps with a different Wi determination for each size class The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm determining the crushing work index Wi C CWi or IWi impact work index
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
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 Bond Crushing And Grinding Calculations Bond Ball Mill Grindability Test The Test Determines The Bond Ball Mill Work Index Which Is Used With Bond
Characterization of rocks for selection of crusher can be done in different ways and the most commonly used is Bond work index Tavares and Carvalho 2007 Holmes 1957 proposed a modification
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Mar 13 2015 Bonds theory 22 1 Bonds work index is the work required to reduce unit weight from a theoretical infinite size to 80 passing 100 m 2 This theory is useful for rough mill sizing 3 The work index is useful for comparing efficiency of milling operations 23 Kicks Theory 24
Bond Work Index For Coal In Crusher SPECIAL Mining machine Coal crushing work index youtube 14 oct 2013 bond work index for coal in crusher crusher machinebauxite crushing bond work equation for jaw crusher get price mill grinding wikipedia with w as grinding work in kjkg w is the work index measured in a laboratory ball mill this type of mill uses the same principle as vsi crusher
The work index covering grinding in tumbling mills of coarse sizes is labelled M ia The work index covering grinding of fine particles is labelled M ib Morrell 2008 M ia values are provided as a standard output from a SMC Test Morrell 2004 a whilst M ib values can be determined using the data generated by a conventional Bond
The Work Index in Blasting OnePetro work index Two blasting tests Bond 1954 on Taconite iron ore in Minnesota work index can be applied to blasting as well as to crushing
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locked cycle HPi similar to the Bond Work Index value where E 10 HPi 1P 80 1F 80 Bond is preferred to the Rittinger equation proposed by others Klymowsky 1997 since the use of the square root 05 exponent for the product goes some way in accounting for the additional energy consumed in generating more fine material
BOND BALL MILL GRINDABILITY TEST The Bond Ball Mill Grindability Test is performed according the original Bond procedure It requires 10 kg of minus 6mesh material that is preferably prepared at the testing facility The Bond Ball Mill Work Index has been widely used for ball mill sizing and is also utilized in computer simulation
Oct 15 2015 where W is the work input kW ht W i is the Bond Work Index kW ht which expresses the resistance of the material to crushing and grinding and F 80 and P 80 are the 80 passing size of the feed and product m respectively
Grindability by Ames Ore grindabihty refers to the ease with which materials can be comminuted and data from grindability tests are used to evaluate crushing and grinding efficiencyProbably the most widely used parameter to measure ore grindability is the Bond work index W The work index Wi is calculated kWh per ton applied in reducing
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