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The Bond work index is not solely a material constant but is influenced by the grinding conditions For example the finer the grind size desired the higher is the kWh/t required to grind to that size Magdalinovic 38 measured the Bond work index of three ore types using different test screen sizes He produced a correlation between the mass of test screen undersize per revolution G and

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MARC Technologies has been providing quality specialised engineered products and solutions since 1999 We are focused primarily in the mining laboratory air pollution control and related industries Our services extend internationally to wherever we are needed Our Laboratory Division specialises in the supply of Laboratory Systems

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3.4.7 Bond rod mill standard testStandard conditions for determining the work index of rod mills under laboratory conditions are mill size = 305 mm internal diameter 610 mm internal length with wave type lining material dry mineral quantity − 1250 cm 3 tapped down to give a reproducible bulk density

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Bond Rod Mill Index Test JKTech A Bond RMWI test is a standard test for determining the Rod Mill Work Index of a sample of ore The BRMWI is a measure of the

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Aug 22 2012 Bond Rod Mill Work Index The Bond Rod Mill Work Index is used to determine the Free Online Chat METSMetallurgical Testwork Therefore the design and engineering of this unit operation play a major The Bond Rod Mill Work Index RWI is a value that gives a measure of the energy Free Online Chat ESSA BondWork

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Jul 15 2013 See this useful summary Table of Bond Work Index by Minerals For any circuit whether a crushing circuit a rod mill or a closed ball mill circuit the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um The sample was received crushed appropriately for the ball mill test.

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Jul 30 2020 Measuring ore grindability in rod mills The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions It is a locked cycle test conducted in closed circuit with a laboratory

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Bond Work Index for Rod Mill Product Image Introduction The Bond Work Index for Ball Mill is a special equipment for testing Bond ball mill work index Simple lab test can choose ball mill by power method or judge the effects of material properties change to the ball milling process or the operation condition of crusher by using this

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The standard Bond Rod Mill Work Index test procedure is firstly to stage crush the feed to pass 12.7 mm and size a representative sample The test then involves a series of batch grinds in a standard Bond rod mill A Bond rod mill is 0.305m by 0.610m with wave liners

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In this study a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores W Ta ranging from coarse grinding rod mills to fine grinding

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Bond Rod Index Mill 12 x 24 consisting of a one 1 piece cast shell complete with integral wave 1 Hp 3/60/220 volt motor/gear reducer drive support frame which allows the mill to tilt 5 degrees during operation and 45 degrees for discharge manual operation receiving pan rod

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BOND ABRASION INDEX MILL abrasion index mill Copy 3 of IMG 0420 abrasion index mill 1/2 BALL MILLS IMG 8600 IMG 8599 BALL MILL 5 IMG 8600 1/12 BELT FEEDER IMG 1054 edited ROD MILLS ROD MILL 1 ROD MILL 2 ROD MILL 6 ROD MILL 1 1/6 ROTARY DIVIDER ROTARY SPLITTER 1 ROTARY SPLITTER 2 ROTARY SPLITTER 9 ROTARY SPLITTER 1

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The Bond rod mill work index is not as common as the Bond ball mill work index and there are two different variations on the mill apparatus.The SAGMILLING models expect a mill with a wave liner and is not compatible with mills using smooth liners .

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Work Index Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index A i.e Wet Ball Mill = kg kWh = 0.16 A i 0.015 0.33 Dry Ball Mill = kg kWh = 0.023A i 0.5 Replacement Ball Size Rowland and Kjos proposed the use of their equation for the determination of the initial and replacement media size.

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Dec 12 2016 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

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Laboratory MillingRod Ball Mills including Bond Rod Ball Work Grindability Index MARC manufactures a wide range of laboratory ball rod mills and automated Bond rod ball mills with wave liners to suit most metallurgical laboratory applications.

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Introduction of the Bond work index w i to the above equations Hard ore 18.0 1.961 Medium ore 12.0 1.290 Soft ore 6.5 0.671 Coefficients k Bond work index w i kWh/short ton Denver ore hardness Table Relationship between the Bond work index w i and the ore hardness designated by Denver

Chat Online### Mill grinding Wikipedia

Rod mills are less common than ball mills for grinding minerals The rods used in the mill usually a high carbon steel can vary in both the length and the diameter However the smaller the rods the larger is the total surface area and hence the greater the grinding efficiency 5

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Generally Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power In the current research a simple fast and accurate procedure is introduced to find the rod mill work index based on the conventional Bond work index.

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Feb 06 2020 The F Bond s Working Index is a grinding parameter expressing the material resistance to crushing or grinding In numerical terms the working index measured in kW h t So this indicator shows the energy amount needs to be spent on grinding the one short ton of material Depending on the method stage of crushing/grinding the F

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The Titan Bond Work Index Rod Mill is one piece cast construction with integral wave liners of a form described by Bond This mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for operating production size rod mills.

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Sep 17 2020 The Bond Ball Mill Work Index remains today as the only tool used for ball mill scale up design For an only nominally not at all materially modified update on its use for industrial mill sizing see Selection of Rod Mills Ball Mills Pebble Mills and Regrind Mills

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The Bond Index conforming rod charge consists of 6 rods of 1.25 diameter and 21 length 2 rods of 1.75 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

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Bond Rod Mill Grindability Test 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 12.5mm material Closing screen sizes typically range from 4.75mm to 212µm.

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1 Introduction The Bond rod mill work index is used in conjunction with Bonds third theory of comminution to merely calculate net energy requirements for sizing rod mills This test was originally developed in the mid 1930s by F.C Bond Though it was altered in succeeding years it has essentially remained unchanged since 1961 1 .

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Typically R = 8 Rod Mill Charge Typically 45 of internal volume 35 65 range Bed porosity typically 40 Height of bed measured in the same way as ball mills Bulk density of rods = 6.25 tons/m3 In wet grinding the solids concentration 1s typically 60 75 by mass A rod in situ and a cutaway of a rod mill interior.

Chat Online### Commentary on the apparatus of the Bond rod mill work index

Apr 27 2016 rod milling is fitted to a tumbling test referred to as the Bond rod mill work index WiRM or RWi The apparatus used to determine this work index was described in 1943 by Bond Maxton and a slightly different apparatus was described by Bergstrom in 1985.

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Bond Grindability Index Test Ball Mill A Bond Ball Mill 12 x 12 of fabricated construction comes with electric motor and gear reducer drive digital counter jogging button to provide positioning of drum for loading and unloading emergency stop button 44 ½ lb ball charge stand and receiving pan.

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Bond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bond s Third Theory of Comminution to calculate net power requirements when sizing ball mills Various correction factors may have to be applied The test is a closed circuit dry grindability test performed in a standard rod mill.

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The Bond Index conforming rod charge consists of 6 rods of 1.25 diameter and 21 length 2 rods of 1.75 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

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Jan 01 2013 The Bond rod mill work index is used in conjunction with Bond s third theory of comminution to merely calculate net energy requirements for sizing rod mills This test was originally developed in the mid 1930s by F.C Bond Though it was altered in succeeding years it has essentially remained unchanged since 1961 .

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Abstract The Bond work index is a research methodology for design and development of multiple type of mills One of them is Bond Work Index having association with ball mill and recognized and used for prediction of ball and rod mill energy which is necessary for selection of

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Jan 01 2016 The Bond method of measurement of the grindability of ores in rod mills and ball mills is long and tedious and requires a standard set of grinding conditions mill size ball charge etc A number of approximate methods have been reported that shorten or approximate the work index estimation.

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Rod mills are less common than ball mills for grinding minerals The rods used in the mill usually a high carbon steel can vary in both the length and the diameter However the smaller the rods the larger is the total surface area and hence the greater the grinding efficiency 5

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Bond s approach consists of determining the ore hardness characteristics or Work Index Wi via standardized laboratory testwork 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 Ai .

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May 01 1993 This will be tested here For the Bond rod mill test a further complication may stem from the implicit non linear nature of rod milling for which a classification effect is ascribed 7 However this classification is mostly associated with transport i.e continuous mills and may not be critical in a Bond Index rod

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AG/SAG 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 mill Because of the range of mill sizes available AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit A diagram of types of AG/SAG

Chat Online### Small Scale Tests to Characterise Ore Grindibility

The Bond rod mill work index is used to calculate the power requirement at intermediate size i.e from 12.5mm to about 1mm The test has been mainly used for the design of rod mills or primary ball mills but it can also be used along with the other Bond tests BWI and cWI for SAG mill design using semi empirical relationship 6 .

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