formula index ng work ball mill mill

Jul 15 2021 Now Click on Ball Mill Sizing under Materials and Metallurgical Now Click on Specific Power of Mill under Ball Mill Sizing The screenshot below displays the page or activity to enter your values to get the answer for the specific power of mill according to the respective parameters which is the Work Index of Ground Material w i 80 Product Size P 80 and 80 Feed Size F 80 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 6350

using a novel ring mill a laboratory ball mill a labora tory rod mill and the semi continuous process using the same rod mill as described below In all cases the min eral sample is crushed and screened to pass a predeter mined size 35 or 4 mm The feed sample undergoes a wet screen analysis and a certain quantity usually 05 Aug 06 2015 The Bond Work Index Formula was used to determine the operating Work Indices for the test rock mill and the parallel rod millball mill circuits This formula taking into account feed size product size and power proved an accurate tool for comparison The operating Work Indices compared favorably and checked laboratory Work Index data

33 Ball Mill Design The ball mill designs also follow the BondRowlings method with comparison with other methods Again the method of use is the same 34 SAGBM Combined design This is the combined model of the SAG and BM models The difference is that a provision in the BM model allows for the fact that finished product is in the BM feed of the mill After the grinding period has been completed the mill is discharged by tilting it downward at an angle of 45 for 30 revolutions The unit volume present in the mill in all tests is 1250 CC of dry solids packed by shaking and the number of grams occupy ing 1250 CC is the unit test weight Unless

2 Calculate the Standard Circuit Bond Work Index WiSTD for the material being processed equation 3 Wtotal WiSTD 3 10 10 P80 F80 The Bond Standard Circuit is the conventional crushingrodball milling circuit that was popular circa 1950 to EURASIAN MINING 1 2015 Technology and technics of ore preparation processes 7 feed for the rod mill ie 10000 m in accordance with Table The value of P 80 is accepted based on the required grainsize characteristics of the ball mill discharge

Feb 21 2013 For example the heavier and harder the media are and the bigger ball drum the greater mecanical shock energy on the mixture and the greatest danger Im pretty sure black powder could be made to explode by milling it in an industry ball mill with 200kg non sparking piece of media Edited by 50AE 25 February 2013 0136 PM Aug 15 2012 ball mill rpm posted in Newbie Questions ok so I know this is a question I should be able to figure out on my own I thought I know of some web sites that had the equation but I must have been wrong any way the jar is 775 inchs wide and 105 inchs long and Im using 50 cal round musket balls for media it will be half full of media so what rpm should I run it at Thanks so much

submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the material to a P 80 of 17 mm is used to predict AGSAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to the AGSAG specific energy as well as specific crush Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8 dia rod mill to 1 mm Closed circuit 8 dia ball mill to P80 um The ore Test Work Index Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK

The grindingproduct size P in a Bond ball mill which is given by the aperture size which passes 80 of the grinding product as a function of the aperture size of the test screen Pk can be expressed by the formula P P k K 2 These functions for G and P enable us to calculate the value of Wi for any other size of grinding product if we know seamless piping less mill tolerance eg ASME B1611 The ratings of these components are addressed in the piping specifications provided in Appendix A If these components are used outside the limits established in the piping specification additional analysis and documentation must be provided 30223 Unlisted Components

Feb 29 2020 Istilah BWI sendiri dapat disebut lagi menjadi Bond Ball Mill Work Index BBWI atau Bond Rod Mill Work Index BRWI Ini tergantung dari media gerus yang digunakan selama percobaan apakah bola baja atau batang baja Untuk menghitung BWI digunakan formula sbb Dimana Wi Nilai bond work index yang dicari kwhton The Bond Index conforming rod charge consists of 6 rods of 125 diameter and 21 length 2 rods of 175 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a waveshaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill

The test simulates a closed grinding circuit in a standard ball or rod mill At CEMTEC these tests are conducted with batch mill ELLA After determining the Bond work index the specific comminution capacity is calculated using the formula listed at the bottom of the page factoring in various correction factors obtained from experience Dec 18 2013 For P80s finer than 75 m the Levin test a modified Bond ball mill work index test may be used to predict grinding performance Signature Plots No general work index formula governing energy use over a range of conditions like the Bond equation for intermediate grinding has yet been found for the fine grinding regime

ball mill work index was averaging only 116 kWht which is not hard A rod mill work index 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 was installed at Mt Isa in 2009 This mill was put into single submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the material to a P 80 of 17 mm is used to predict AGSAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to the AGSAG specific energy as well as specific crush

Nov 18 2014 The Bonds work index values increased as test sieve size decreased 16 Bond work index is changed with the change in the test sieve size and circulating load This must be taken into account when energy consumption is calculated according to the Bond formula unit energy cost extra increased as circulating load decreased from 250 crusher and milled in a ball mill for 8 hours The raw materials slips were removed from the ball mill and again dried at 110C ground in a mill to a particular size of 1mm Moisture was added by means of a spray gun to achieve a moisture content of 5 The sample was then screened through a 1mm sieve in order to break up

ISCAR is a dynamic full line supplier of precision carbide metal working tools producing a wide range of carbide inserts carbide end mills and cutting tools covering most metal cutting applications The Critical Speed for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shells inside surface This is the rotational speed where balls will not fall away from the mills shell Result 1 This mill would need to spin at RPM to be at 100 critical speed Result 2 This mills

Raw 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 factorsThe model allows a manual calibration factor on both equations CF SAG and CF ball respectivelyThis formula usually gives higher total circuit specific energy Metso Outotec is a frontrunner in sustainable minerals processing technologies endtoend solutions and services globally The company helps aggregates mining metals refining and recycling customers improve efficiency productivity and reduce risks Read more on Metso Outotec website

The work index laboratory measurement can be made with a variety of equipment The most common is the Bond ball mill work index Figure 1 Ball mill for determining Bond ball mill work index Many people refer to the Bond work index when they really mean the Bond ball mill work index To calculate the work index Wi in a laboratoryscale ball mill Bond first derived the equation 1 and thereafter derived the revised formula that is currently in use 2 where Wi Bond work index kWh t1 Pc test sieve mesh size m Gweight of the testsieve fresh undersize per mill revolution

The test simulates a closed grinding circuit in a standard ball or rod mill At CEMTEC these tests are conducted with batch mill ELLA After determining the Bond work index the specific comminution capacity is calculated using the formula listed at the bottom of the page factoring in various correction factors obtained from experience First a Jar Mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net Hphrt to grind from the design feed size to the required product size The second test a Bond Work Index determination results in a specific energy value