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.

Provided by data from the standard bond ball work index test using the following equation morrell 2006 m 80 80 0295 1 80 80 18 18 ib f p p gbp p f f f 6 where m ib fine ore work index kwhtonne p 1 closing screen size in microns gbp net grams of screen undersize per mill revolution p 80 80 passing size of the product in microns f

Apr 08 2018 the parameter wi known as the work index of the ore is obtained from batch bench tests first devised by bond 1961 the power calculated on using equation 1 bond 1961 rowland and kjos 1978 relates to 1 rod milling – a rod mill with a diameter of 244 meters inside new liners grinding wet in open

Ball mill operatng work index effeciency ball mill work index calculation xls sjarelke ball mill operatng work index calculation use this online formula to calculate a ball mill rod mill or sag mill operating work index a bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated

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 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

Ball mill work index test was widely used in the 1960s and still remains in use today gharehgheshlagh 2016 the ball mill work index of the feed samples was determined according to the standard

Ball mill work index was averaging only 116 kwht which is not hard a rod mill work index ﬁ gure was not found but was thought to be in the 16 kwht to 18 kwht range the xstrata zinc 22 ft id 40 ft egl over ow ball mill ﬂ was installed at mt isa in 2009 this mill was put into

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 80 passing inch

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

From a global test set were tested using the two ball mills to determine the bond work index of the materials this number was used in the final bond work index calculation 15

Jan 01 1989 introduction the energy consumption for grinding according to bond 1961 is deter mined by the formula 10 10 i the work index is determined by grinding experiments carried out in a labo ratory bond ball mill based on the results of grinding experiments numerical values of the work index wi are calculated according to the formula 03017516890350 1989 elsevier science

Keywords ball mills grinding circuit process control i introduction grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical mechanical and chemical characteristics typical examples are the various ores minerals limestone

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 ball mill

Mar 14 2015 use this online formula to calculate a ball mill rod mill or sag mill operating work index based on fred bond’s work you can estimate the energy used into your grinding circuit this is the most accurate and informative method but much of the data necessary for its application is not yet available a total apparent volumetric charge filling – including balls and excess slurry on top of the ball

Mar 19 2017 no bwi bond work index required here but be aware it is only a crude approximation for most soft ores from f80 1 cm to p80 700um ball mill design power example calculation calculate ball mill grinding capacity by l d michaud march 19 2017 february 14

Mill diameter mineral density work index bond estimated the amount of wear in terms of kilograms per kwh based on the abrasion index a ie wet ball mill kg kwh 016a i0015 033 dry ball mill kg kwh 0023a i 05 replacement ball

Oct 19 2017 it uses to help determine the grinding media optimal size must be loaded into the ball mill for proper operation ensure the calculation formula is below b — the grinding balls diameter mm a — the correction factor for grinding balls a 2017 for cilpence a

Oct 24 2018 to calculate the operating work index of a circuit you must measure four things p the power draw of the mill this is usually calculated from the input leads to the motor then multiplied by

Retically the work index equals the amount of energy kwht consumed to comminute 1 t of infinite size material down to 80 content of –100 μm size grade the mechanism and nature of mineral comminution greatly depends on the size of the mineral particles therefore a work index 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 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 index determination for the material size of interest or by

The bond equation is used to calculate ball mill specific energy from t 80 to the final product p 80 size the total circuit specific energy is the sum of the sag mill and ball mill specific energies w sag rms16000ms4473 4 w t k ak bw sag10bwit 8005170005ef5 w bmk bm 5 where w sag sag mill specific energy from

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 w i 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 producttherefore in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when for a given size of grinding product the value of the work index w i

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

Zthe ballmill dimensions internal mill diameter d and length l for a given ld ratio for feed size d f and product size d mm for a known bond work index w i kwhshort ton and for desirable capacity t short tonh can be calculated from d d t d d l f 35 0106 0193 0962 1038 09180 1 −

2 the operating work index wio of an existing grinding circuit can be calculated given known mill power draw throughput feed and product size distributions kwht power applied per ton of feed to the grinding unit wi the standard bond work index of the ore p 80 the 80 cumulative passing size of the product in microns f

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