modeling the specific grinding energy and ball modelling the specific grinding energy and ballmill scaleup ballmill scale up bond’s law data zbond work index w i zfeed d f and product d size both 80 cumulative passing result the specific grinding energy w mill power draw p wt where t the mill capacity mill dimensions from tables or charts

bond mill power equation fred bond ball mill power draw equations pieprz fred bond ball mill power draw equations grinding mill ball mills are used primary for single stage fine grinding regrinding and as the second stage in get price and support online formulas for ball mill thinkgloballysouthjersey also known as the bond formula

bond work index energy equation grinding the dry feed of a ball mill circuit is 300 th the power at the pinion of the ball mill is 1800 kw f80 80 passing size of the circuit feed in microns 2500 um p80 80 passing size of the circuit product in microns 225 um solution work input energy input w 1800 kw 300 th60 kwht then wi work index of this circuit

relationships between comminution j energy and 1952 and modified it in 1961 the standard bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load the standard procedural outline of the test is stated in bond 1961 the work index for a ball mill wi is then calculated from the following equation 7

ball mill designpower calculation 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

standard bond ball mill grindability test methodprocedure place material charge and ball charge in mill run x revolutions x number of revolutions based on estimate of work index usually 50 100 150 or 200 revolutions dump mill separate balls

grinding classification circuits grinding classification circuits robertd 20180617t0951340400 low ratio of reduction ball mill the need to use this factor does not occur very often as it only applies to ball milling when the ratio of reduction is less than 6 the bond equation and the equations for the associated efficiency factors can be used by plant

bond work index an overview sciencedirect topics modeling these machines with energybased methods requires either recalibrating equations in the case of the bond series or developing entirely new tests that are not confused by the nonstandard particle size distributions

ball mill designpower calculation 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

20150821 morrell methodgmgicev01r01 morrell and the bond ball mill test work index wibm gmg 2016a and the morrell equations and their application see annex b a worked example is provided in annex c 5 scope the morrell method can be used to predict the specific energy of comminution circuits where such circuits include combinations of any of the following equipment

the use of energy index the f bond index mar 26 2020 · the f bond ball mill we continue to consider the methods of grinding process planning based on the calculations of different energy indexes in this article we are going to consider the methodology for calculating index which has a direct impact on the choice of sag mills when engineering the grinding process вwi is the ball grinding work index it is used to calculate the energy

quick method for bond work micrometers 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 material approximately weighing 10 kg which coarseness is 100 3327 mm

energy savings and technology comparison bond ball top size millpebs energy savings finer grind secondary ball mill cuznpb 120 93 8 mm 100 36 same regrind ball mill cupb 120 30 5 mm 100 37 same regrind ball mill cuznpb 100 40 5 mm 100 40 same regrind ball mill aucu 95 90 6 mm 100 39 same regrind ball mill au 180 130 8 mm 30 10 5

stirred media mills in the mining industry material another issue is the fact that the bond ball mill index test is carried out dry whereas many industrial ball mill processes are wet agglomeration in dry ball milling often becomes limiting at p 80 values of around 87 μm which is a factor that limits its applicability to fine grinding

bond work index tests grinding solutions ltd grinding solutions can carry out bond rod mill work index tests to determine the energy requirements for milling ore in a rod mill the test requires a minimum of 20kg of 125mm material closing screen sizes typically range from 475mm to 212µm

specific comminution energy smc testing specific comminution energy general this model uses the equations published in the following 2 papers which the user is encouraged to read morrell s 2010 predicting the specific energy required for size reduction of relatively coarse that is used has come from a bond ball mill work index test that has generated a similar value to that

pdf a quick method for bond work index approximate quick method for bond work index approximate value determination 331 and presented a general ball mill grinding equation based on first is defined in a bond ball mill on the samples of

orway mineral consultants canada ltd mississauga on the bond equation is used to calculate ball mill specific energy from t 80 to the final product p 80 size the bm ball mill specific energy from t 80 17 mm to final product p 80 using bond’s law kwht w t total grinding mill circuit specific energy kwht note that k

how to calculate the energy consumption of a ball mill how to calculate the energy consumption of a ball mill the power predictions for ball mills typically use the following form of the bond equation read more calculation of energy required for grinding in a ball mill therefore in practice we can expect some difficulties and errors when the energy consumption is determined according to

jktech laboratory services jktech jktech for example the specific energy requirement for a given grinding duty bbmwi feed size and required product size it is then possible to determine the size of mill required based on throughput and therefore motor power the standard bond ball mill work index test procedure is firstly to stage crush the feed to minus 335mm and size a

modelraw bondbarratt sab sabc model bond model this is a sag or ag mill plus ball mill model that estimates the specific energy consumption e sag using the 1979 barratt equation and the classical bond work index equation including rowland efficiency model allows a manual calibration factor on both equations cf sag and cf ball respectivelythis formula usually gives higher total circuit specific energy

ball mill designpower calculation linkedin dec 12 2016 · if p is less than 80 passing 70 microns power consumption will be ball mill power calculation example a wet grinding ball mill in closed circuit is to be fed 100 tph of a