# bond ball mill work equation in wills

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• ### Operating work index is not the specific energy consumption

Oct 24 2018  The Work Index is a fitted coefficient to Bond s equation given in the picture above The work index can either be measured in the laboratory the Bond ball mill work index determination is a

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• ### Improved characterisation of ball milling energy

pressure grinding rolls HPGR products based on a Bond mill test procedure Multiple trade off studies have reported the performance of HPGR versus SAG milling with energy savings of between 11 and 32 per cent One factor that is often inconsistently defined in these studies is the change in the Bond Ball Work Index BBWi .

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• ### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

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 i.e

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• ### Bond Work Index Procedure and Method

Jun 06 2015  This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing

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• ### FC Bond MillSepor

The ball mill work index Wi kWh/short ton is calculated from the following equation Bond 1961 1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush The FC Bond ball mill is now ready for the next sample.

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• ### Bond Work Index Energy equation Grinding

First stage will be broken into two parts as well you use a Bond rod mill work index for the coarse component of the ore 2.1 mm and the Bond ball mill work index for the fine component 2.1 mm It would look like this E prim = 10 Wi rm 2100 0.5F 80 0.5 10 Wi bm T 80 0.52100

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• ### Estimation of Grinding Time for Desired Particle Size

Jan 03 2020  Grinding Studies Two kinds of mills BBM and LBM were used to achieve the desired P 80 passing percentage of 150 μm with an acceptable range of hematite liberation > 75 at optimum grinding time The BBM is a standard ball mill having a length and diameter of 300 mm 300 mm with smooth liner as shown in Fig 2.A rotating drum is attached to a gearbox and has adjustable speed knob.

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• ### Relationships between comminution J energy and product

determination of the work index for ball and rod mills in 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

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• ### Bond Efficiency GMG ICE v1 r04 Determining the

WiBM Bond Ball Mill Test Work Index kWh/t Wic Bond Impact Crushing Test Work Index kWh/t WioACT Actual Operating Bond Work Index determined from measurements on the circuit kWh/t equation 1 Auxiliary equipment power is excluded P W = ––– 1 T Where W is the specific work input kWh/t P is the equip

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• ### SIMPLIFIED BOND WORK INDEX DETERMINATION By R O

Gb Bond s standard ball mill grindability net grams p of ball mill product passing sieve size P 1 produced per mill revolution The rest of the terms are defined as in Equation 1 The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 2.44 meter 8ft inside liners

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• ### bond ball mill work index for pure quartz

bond ball mill work index for pure quartz bond ball mill work index equation in wills Mining bond grinding work index for quartz stone kilawarhing Table of Bond Work Index by Minerals This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on around the world sample Online Chat

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• ### Procedure for determination of ball Bond work index in the

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to

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• ### Bond formula for the grinding balls size calculation

Oct 19 2017  There is a mathematical solution to this problemthe Bond formula 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 Bthe grinding balls diameter mm Athe correction factor for grinding balls A = 20 17 for cilpence A = 18 15

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• ### Correction of Bond Ball Mill Work Index Test for Closing

Dec 07 2018  The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another The proposed model consists of two components the variable coefficient that is determined from a specific work index determination and a

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• ### Procedure for determination of ball Bond work index in the

Jan 01 2009  In the determination of ball mill work index 15 kg of representative ore at 100 3.35 mm is crushed to 100 − 3.35 mm Amtech 2006 The first grinding test is started with an arbitrarily chosen number of mill revolutions At the end of each grinding cycle the entire product is discharged from the mill and is screened on a test sieve.

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• ### Model Bond/Barratt SABC ModelsSAGMILLING

Bond/Barratt Specific Energy Consumption SABC Model This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi stage crushing and single stage ball milling E ssbm including Rowland efficiency factors.The circuit E total is equal to the E ssbm plus an inefficiency factor CF related to

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• ### PDF Rock Characteristics and Ball Mill Energy

The tests were performed 2 Materials and Methods Used in a standard Bond ball mill with weight of material equivalent to 700 cm3 After every grinding cycle 2.1 Sampling and Sampling Preparation the mass of the minus 106 µm fraction was replaced with fresh feed to keep the mass of the Twenty four 24 samples weighing about 50 kg mill feed

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• ### Size Reduction and Energy RequirementScienceDirect

Jan 01 2016  Napier Munn et al indicated a possible correlation between the impact parameter A b and the Bond ball mill work index given by the equation 3.22 A ⋅ b = − 3.5 W i 117 The T 10 –mass distribution curve is useful as it is a description of the product size distribution and the T 10 can be considered an index of the degree of breakage.

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• ### bond work index grinding equipment sizing

ball mill sizing with bond method work index base A comparison of the Bond method for sizing wet tumbling A comparison is made of the results from a ball mill model simulation with those of the conventional Bond ball mill design method for a material whose breakage characteristics and Work Index have been determined.

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• ### calculating ore dressing mill efficiency calculation

In this equation the calculated work index values of bauxite samples are PDF 458.9 KJournal of Mining and Environment was ground in various grinding times according to the Bond Ball mill approach to specify the work index values A new equation was

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• ### BOND S WORK INDEX WHAT IT IS AND WHAT IT ISN T

reduction term of Bond s Equation The engineers writing these reports may have been confused because the industry commonly uses units of kWh/t for both quantities even though the two quantities refer to different things It is incorrect to say for example the ball mill work index is 13 kWh/t and the SAG mill SEC is 5 kWh/t

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• ### Rittingeran overview ScienceDirect Topics

Bond s Table II BON 54 gives a correction coefficient for the mill s shaft energy according to the latter s type and φ. 2 Milled output with a size that is less than 70 μm The reference value W i must be multiplied by an enhancing coefficient BON 54 p 384 . 3 Wet grinding and dry grinding Dry grinding requires more energy than wet grinding.

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• ### Bond Index Ball Mill Rod Mill BT 100 XLRETSCH

The optimum number of grinding balls is 285 However the ball diameters vary due to wear Therefore the total ball number should be adjusted from time to time to ensure a total mass of 20.125 grams The grinding jar of the Bond Index Ball Mill measures 12″ x 12″ and has well rounded corners Module Rod Mill

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• ### CALCULATION OF THE POWER DRAW OF DRY

To determine the power that a dry grinding needs full grate discharge mill Equation 1 is multiplied by the factor of 1.08 A multi compartment 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

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• ### A Review of Alternative Procedures to the Bond Ball Mill

Jul 12 2021  standard Bond ball mill in time intervals of 0.5 min 1 min 2 min and 4 min After each grinding run the mass of the sample is measured and the PSD is determined.

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• ### Bond equation of cement ball mill sizing

Nov 12 2015  Two calculators have been developed for sizing mono chamber mills and two compartments mills 2 Bond equation and correction factors E = specific energy in kWh/t WI = work index in kWh/t C = correction factor P80 = sieve which has 80 of passing in the product F80 = sieve which has 80 of passing in the feed.

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• ### bond ball mill work index equation in wills

bond ball mill work equation in wills The work index Wi is calculated in a laboratory scale ball mill with Bond equation The Bond work index has been widely used in designing full scale mills but the Bond test is rather complex lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond test procedure Weiss 1985 .

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• ### ball mill for bond indemodellbahn verkauf

Jun 01 2020  Ball Mill Bond Work Indexjoelle nails Ball Mill Bond Work Index A bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits sample requirements a minimum of 10 kg of material crushed to nominally minus 10 mm is preferred jktech would stage crush the sample to minus 335 mm as required for the bond ball mill work

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• ### A new approach to the calculation of bond work index for

May 01 2021  The Bond grindability test is performed in a standard Bond ball mill dimensions DxL=305x305 mm and a speed revolution of 70 min −1 The mill is filled with balls with a diameter of 15.5 to 30.6 mm and has a total weight of 20.125 kg.

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• ### DETERMINATION OF THE BOND S WORK INDEX OF BABAN

theoretically infinite feed size to 80 passing 100μm Wills and Napierpercent Munn 2006 Bond devised several methods for predicting ball mill and rod mill energy requirements and provided an accurate measure of ore grindability Gupta and Yan 2006 The standard Bond

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• ### Kinetic grinding test approach to estimate the ball mill

Kinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bond s ball mill grindability test Bond 1961 This test is performed according to the standard Bond procedure which proposed model is presented in Eq 1

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• ### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

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 raw material approximately weighing 10 kg which coarseness is 100 3.327 mm.

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• ### Grinding Mill Computer Model

Rowling are used to calculate the mill power draw The Morgärdshammar equation and the IMM equations are shown for comparison The method of use is similar to the AM section 3.3 Ball Mill Design The ball mill designs also follow the Bond/Rowlings method with comparison with other methods Again the method of use is the same

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