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10 mm the crushing work index swi is applicable for medium size particles from 100 mm to 2100 μm — 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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21 conclusions continued in the present work equations were also derived giving zthe ballmill power drawp as a function of its dimensions internal mill diameter d and length l zthe ballmill power drawp as a function of the feed d f mm and the product size d mm the bond work index w i kwhshort ton and the mill throughput t short tonh zthe ballmill dimensions d and l when

80 sizes typically reached by conventional ball milling the delineating size between coarse and fine grinding is 750 m smc test results are used to determine the drop weight index dwi and the coarse ore grinding index m ia test data from the bond ball mill work index test is used to calculate the fine grinding index m ib the m ia and

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

Ball mill work index calculation xls the full suite of bond comminution tests provide the ball mill work index bwi the rod mill work index rwi the crusher work index cwi and the abrasion index mill grinding wikipedia w is the work index measured in a laboratory ball mill kilowatthours per metric or short ton p 80 is the mill

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

Equation 1 is multiplied by the factor of 108 a multicompartment ball mill consists of two or more grate discharge ball mills in series the same equation is used to calculate the power that each ball mill compartment should draw the total power is the sum of the

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

Gates jd giblett a dunne r 2012 prediction of plant ball mill media wear rates from laboratory ball mill test data comminution 12 minerals engineering wear of grinding media in the

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

Jan 01 1989 calculation of energy required for grinding in a ball mill int j miner process 25 4146 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

Mar 08 2013 calculation of ball mill grinding efficiency dear experts please tell me how to calculate the grinding efficiency of a closed ckt amp open ckt ball mill in literatures it is written that the grinding efficiency of ball mill is very less less than 10 please expalin in a n excel sheet to calcualte the same thanks sidhant

May 30 2016 the ultimate crystalline size of graphite estimated by the raman intensity ratio of 25 nm for the agate ballmill is smaller than that of 35 nm for the stainless ballmill while the milling

Mill powerball millsxls scallop height calculator 3 8 9 grinding task 10 ore work index kwhton metric more detailed ball mill grinding media calculation in excel crusher machine ball mill grinding media calculation in excel by difference of the required grinding energy is the basis for the two bond rod and

Mill was measured using a purpose built power meter to facilitate the calculation of specific grinding energy results table i shows the bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after lims the concentrate weight recovery was in the order of 50–60 furthermore it may

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

Rod mill work index has not been de ned as yet the ball ﬁ mill work index is con rmed at 16 kwht the operating ﬁ work index though is in the range of 21 kwht to 25 kwht showing high inefﬁ ciency this raises the point that in some cases the bond ef4 oversize factor calculation is

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

The 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 openclosed

The bond lowenergy impact crushing work index more informally the bond crushing work index is not as common as the bond ball mill work index and it is a notoriously noisy test the test is a perspecimen test where individual specimens of prepared rock are handpicked by the test operator and placed into the

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

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 amp fuersteneau power model see mill powerball mills spreadsheet for further details on such

The mill product can either be finished size ready for processing or an intermediate size ready for final grinding in a rod mill ball mill or pebble mill agsag mills can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work of a ball

The work index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill 2 procedure 21 bond ball mill grindability the sample was crushed to 100 passing 6 mesh 335mm from this a 700 cc volume was measured and weighed to be used as feed for the bond

You can also perform table tennis ball calculations using my table tennis ball speed calculator or my ball speed calculator i used the exceltm spreadsheet to calculate an average speed of 589 mph read more what size stepper motor do ineed mycncuk bond rod mill ball mill and crushing work index tests have been studied for

7 z lingjia c bingchen a study of simulating calculation method of the bond for industries and factories to determine the bond work index as ball mill work index in china japan and america particuology 1988 rapidly as

a total apparent volumetric charge filling – including balls and excess slurry on top of the ball charge plus the interstitial voids in between the balls – expressed as a percentage of the net internal mill volume inside liners b overflow discharge mills operating at low ball fillings – slurry may accumulate on top of the ball charge causing the total charge filling level to

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