The Bond operating work index is in common use for assessment of comminution efficiency This method was developed for rod and grinding ball mill circuits and is not well suited to AGSAG mills or the wide range of comminution devices now in common use Traditional measures of efficiency only consider the net motor power of the drive unit
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Detailsa Mill Geometry and Speed – Bond 1954 observed grinding efficiency to be a function of ball mill diameter and established empirical relationships for recommended media size and mill speed that take this factor into account As well mills with different length to diameter ratios for a given power rating will yield different material retention times the longer units being utilized for high reduction ratios and the shorter ones where overgrinding
DetailsUse 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
DetailsThe Bond operating work index is in common use for assessment of comminution efficiency This method was developed for rod and grinding ball mill circuits and is not well suited to AGSAG mills or the wide range of comminution devices now in common use
DetailsMill operators have long used operating work indices to evaluate grinding circuit efficiency with great utility Operating work indices can be used to evaluate individual units in a conventional circuit or the overall performance of an autogenoussemiautogenous AGSAGball mill circuit but they are of limited value in evaluating AGSAG and ball mill sections separately
DetailsFor example when 60 of the solids in a ball mill is coarse then the coarse solids inventory in the mill is 60 and only 60 of the mill grinding volume and power is used for the grinding of coarse particles The classification system efficiency of the circuit is then only 60
DetailsBall 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 ¼ inch 6350 microns The required product size distribution is to be 80 passing 100 mesh 149 microns
DetailsWork indices calculated from operating data when compared to work indices obtained from Bond Grindability tests for the same mill feed give a direct measure of grinding efficiency The Bond Equation and the equations for the associated efficiency factors can be used by plant supervisory and technical personnel and can also be used in computer
DetailsUse 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
DetailsThe world widely relies on the ball mill work index for the design and The rod mill work index is computed with an equation very similar to that of the ball McKen A Raabe H Mosher J 2001 “Application of Operating Work Indices to Read more
DetailsThe operating principle of the ball mill consists of following steps In a continuously operating ball mill feed material fed through the central hole one of the caps into the drum and moves therealong being exposed by grinding media The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls
DetailsIn the prerequisite module entitled Work Index Efficiency you have learned about work index analysis to define overall grinding circuit efficiency In rod milling you can use work index analysis to relate design and operating variables to overall circuit efficiency However you cannot use work index analysis for the same purpose on ball mill
DetailsBall Mill DesignPower Calculation 17 · 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
Detailstwo Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution The Bond Work Index relationship has been noted to apply down to approximately 70 m and perhaps no finerµ without making qualifications Calculations First calculate the actual Operating Work Index WloACT of the
DetailsWioACT Actual Operating Bond Work Index determined from measurements on the circuit kWht WiRM Bond Rod Mill Test Work Index kWht WiSTD Standard Circuit Bond Work Index expected or designed used for circuit design Specific energy requirement at the drive pinions DS Work Index Work Index Efficiency Bond Work Index testing
Detailsapproach acknowledges grinding efficiency as the ratio of operating work index to that for a singlestage ball mill The Barratt approach is the basis of the Millpower 2000 computerbased program Matthews and submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the material to a P
DetailsA comparison of wear rates of ball mill grinding A comparison of wear rates of ball mill grinding ta and ball mill work index The research findings allow passing
DetailsJKTech Laboratory Services Bond Ball Mill Index Test BRMWI A Bond Ball Mill Index Test BBMWI is a standard test for determining the Ball Mill Work Index of a sample of ore The BBMWI is a measure of the resistance of the material to crushing and grinding It can be used to determine
DetailsMetallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits and form the
DetailsIn this article alternative forms of optimizing the milling efficiency of a laboratory scale ball mill by varying the grinding media size distribution and the feed material particle size distribution were investigated Silica ore was used as the test material
DetailsBondBarratt 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 multistage crushing and singlestage ball milling E ssbm including Rowland efficiency circuit E total is equal to the E ssbm plus an inefficiency factor CF related to
DetailsBall Mill Batch Process The mill dimensions D × L are 0204 × 0158 m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material
DetailsIn this case as the work index and ball mill conditions are unknown we refer to the Appendix and find that the work index of a gold ore is typically 1483 kWht Step 2 To determine the maximum ball size to be charged to grind the ore Equation 716 may be applied as all
DetailsWith the Bond Ball Mill Work Index used to predict a base line power consumption it is possible to use the operating work index observed in a SAG milling circuit Wio when ratioed to the Bond Ball Mill Work Index Wib on a sample of the same ore as a measure of power efficiency in the circuit
DetailsAnalysis of ball mill grinding operation using mill power specific kinetic parameters Effect of operating variables on the energy efficiency of ball mill analyzed it is recommended that the mill design and scaleup work should be based mainly on the F parameters
DetailsEnergy Efficient Ball Mill Circuit – Equipment Sizing Considerations the effect of cla ssification efficiency on ball mill circuit for Bond ball mill work index or batch grinding tests
DetailsBond 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 closedcircuit dry grindability test performed in a standard rod mill
DetailsThe Optimized BondBarratt model is best used for low competency ores such as those found in the Western Cordillera of North America or the Andes where the impact crushing work index is similar to or less than the rod mill and ball mill work index values These ores tend to
DetailsThe effect of circulating load and classification efficiency on the performance of ball mill circuits is compared to the effect on HPGR circuits The fundamentals of grinding behavior are also
DetailsThe high unit capacity SAG millball mill circuit is dominant today and has contributed toward substantial savings in capital and operating costs which has in turn made many lowgrade hightonnage operations such as copper and gold ores feasible Future circuits may see increasing use of high pressure grinding rolls Rosas et al 2012
DetailsBond Work Index Tests Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills For more information on the tests please see below Bond Low Energy Impact Test The Bond LowEnergy Impact test can be used to determine the Crusher Work index CWi also known as the Impact Work Index
DetailsProcedure for determination of ball Bond work index in the commercial operations Bond Ball Mill Work Index which expresses the resistance of material to ball milling be used as a guide to
DetailsA Bond ball mill work index is then performed on the mill product for the design of SAGball mill circuits This is important because it was found that there was a 1–15 kWht higher ball mill work index if the –335 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing
DetailsJul 31 2014 · Wm Wi 80P 10 80F 10 1 where Wm is mill specific motor output power kWht Wi is the Bond ball mill work index kWht P80 is sieve size passing 80 of the mill product µm F80 is sieve size passing 80 of the mill feed µm The “efficiency factors” Rowland 1975 modify equation 1 so that it caters for circuit
DetailsA comparison of wear rates of ball mill grinding A comparison of wear rates of ball mill grinding ta and ball mill work index The research findings allow passing
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