
Bond rod mill ball mill and crushing work index tests have been studied for years to other than excel or a data base of calculation instead of simulation with other ores has eliminated mistakes caused by comparing ores with different
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Work index spreadsheet was designed to estimate the operational work index of a given grinding installation of known dimensions and operating conditions of the operational response of conventional ball mills in various grinding circuits data whenever available from backcalculation
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Dec 12 2016 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 distribution of
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Ball mill work index calculation xls ball mill designpower calculation 2020625 ball mill power calculation example 1 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 distribution of 80 passing inch 6350 micronsget price
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The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 336 mm 6 mesh to product size in the range of 45150 m 325100 mesh thus determining the ball mill work index wi b or bwi the work index calculations across a narrow size range are conducted using the appropriate laboratory work
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The bond work index wi is defined in a bond ball mill on the samples of standard size 3327 0 mm a procedure for the calculation of the bond work index is suggested for cases when the
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Ball mill operatng work index calculation rod mill work index has not been de ned as yet the ball mill work index is con rmed at 16 kwht the operating work index though is in the range of 21 kwht to 25 kwht showing high inef ciency this raises the point that in some cases the bond ef4 oversize factor calculation is
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Rod mill work index has not been de ned as yet the ball mill work index is con rmed at 16 kwht the operating work index though is in the range of 21 kwht to 25 kwht showing high inef ciency this raises the point that in some cases the bond ef4 oversize factor calculation is
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However in this situation the ball mill has to supply this energy and it has a different higher work index than the crusher ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction hence from equation 7 to crush to the ball mill
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A bond ball mill index test bbmwi is a standard test for determining the ball mill work a bond ball mill work index test may be required for the design of a how about ball mill design calculation xls and pdf file lead ore ball mill design calculation xls and pdf file is one of the most commonly used smeltdry mortar
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Oct 19 2017 past experience of a ball mill it is possible to calculate the grinding media average diameter formed in the mill operation during grinding media unload from mill the grinding balls bulk weight in fully unloaded mill other enterprises it is possible to obtain the necessary data on a grinding media granulometric composition from
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Kolkata ball mill work index calculation xls ball mill operatng work index effeciencybwi bond ball mill work index on sag ground ore kwhton ground f 80 80 passing of sag ground of the test feed size microns p 80 80 passing from the test product size microns p cs bond closing screen size microns g pb ball mill grindability average of last three cycles grrev determination of the sag and
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Calculate a mills operating work index know more 17 mar 2017 use this online formula to calculate a ball mill rod mill or sag mill operating work index based on fred bonds work
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The bondop work index spreadsheet was designed to estimate the operational work index of a given grinding installation of known dimensions and operating conditions based on the traditional bonds law and the hogg fuersteneau power model see mill powerball mills spreadsheet for further details on such model
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Ball mill bond work index bond ball mill work index the bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the bond work index the test is a lockedcycle test where ground product is removed from test cycles and replaced by fresh feed
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Ball mill wio bwio 86 circuit wio owio 146 bond ball mill work index bwi kwht 134 bond rod mill work index rwi kwht 181 table 1 example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on
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Bond rod mill ball mill and crushing work index tests have been studied for years to should to be standardized to a point where the design calculations relate the empirical note that all 5 inputs to this calculation spreadsheet including
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Ball mill instruction manual pdf bico inc the fc bond ball mill is a small universal laboratory mill used in calculating the made in the bico mill rurming at 70 revolutions per minute with a charge of285 iron balls lhe work requircd is proportiodal to the rcdultioo in volume read more
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This is because work index frequently changes as a function of the product size in comminution if target grind size during a project is changed or if the test is run at the wrong product size then it is necessarily to provide a correction the goal of this work is to create an equation to adjust a bond ball mill work index from one p 80 basis
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For overflow ball mills the charge should not exceed 45 of the mill volume for grate discharge mills the charge should occupy about 50 of the mill volume bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge he and the radius of the mill r ie
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The bond work index wi is defined in a bond ball mill on the samples of standard size 3327 0 mm a procedure for the calculation of the bond work index is suggested for cases when the
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Mill volume filling calculation you may have 29 rows exposed at the discharge end of the mill and only 28 exposed at the feed end if so enter 285 for the number of exposed lifters calculated mill charge feel free to download them for use in your own work subject to the disclaimer
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Oleg d neikov in handbook of nonferrous metal powders 2009 tumbling ball mills tumbling ball mills or ball mills are most widely used in both wet and dry systems in batch and continuous operations and on a small and large scale grinding elements in ball mills travel at different velocities therefore collision force direction and kinetic energy between two or more elements vary
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10 mm the crushing work index swi is applicable for medium size particles from 100 mm to 2100 m rod milling work index rwi for finer particles ball milling work index bwi table these indexes are readily obtained using the specialpurpose laboratory equipment fig 1 finding the total specific energy consumption
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The optimum number of grinding balls is 285 however the ball diameters vary due to wear therefore the total ball number should be adjusted from time to time to ensure a total mass of 20125 grams the grinding jar of the bond index ball mill measures 12 x 12 and has wellrounded corners module rod mill
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Laboratory ball mill if the mill diameter is greater than 381m the cylindrical feed characteristics the laboratory ball mill was designed for grinding limestone meaning that the work index required for the specific power calculation was assumed to be the work index of limestone which is 116 kwht with a specific gravity of 26 gcm 3
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Ball mill batch process the mill dimensions d l are 0204 0158 m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter the mill rotates on rolls and its frequency is a new approach to the calculation of work index and the potential energy of a particulate material
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