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Get PriceA 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 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.
2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up Bonds LawData 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
Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bonds 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. A Total Apparent Volumetric Charge Filling including balls and excess slurry on top of
A Total Apparent Volumetric Charge Filling including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls expressed as a percentage of the net internal mill volume inside liners. B Overflow Discharge Mills operating at low ball fillings slurry may accumulate on top of the ball charge causing, the Total Charge Filling Level to be
Bond 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.
Bond F. C., Crushing Tests by Pressure and Impact, Trans AIME, Vol 169, 1947, pp 5866. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bonds Third Theory of Comminution to calculate net power requirements when sizing ball mills. Various correction factors may have to be applied.
standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design SAGDesign Tests, patented by Outokumpu. See reference 8 below. The comparison of these results gives context to how the various measurements relate to each
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.,
The work index values of the Magdalinovic method agree with this average Bond work index because the method does not simulate the recycling of harder components into the mill charge. On the other hand, the work index obtained using the standard Bond test shows the weighting of the work index towards the harder component as a result of the
A Total Apparent Volumetric Charge Filling including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls expressed as a percentage of the net internal mill volume inside liners. B Overflow Discharge Mills operating at low ball fillings slurry may accumulate on top of the ball charge causing, the Total Charge Filling Level to be
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.
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 lt12 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 Laboratory.
Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size SAG mill design requires an appropriate SAG test, for example, SPI Chapter 5. Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral Chapter 12 .
The F.C. Bond Ball Mill is a small universal laboratory mill used in calculating the grindability grams. 700 CC ofminus 6 mesh, stage crushed, dry feed was used and the circulation load gasket, Insert the sample atrd ball charge into the drum. Replace val in prdicting the size and capacity of Dew installa tions. Chat Now
to ball filling variation in the mill. The results obtained from this work show, the ball filling percentage variation is between 1.2 3.7 which is lower than mill ball filling percentage, according to the designed conditions 15. In addition, acquired load samplings result for mill ball filling was 1.3.
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
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 12 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 Laboratory.
SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21. The largest SAG mill is 4239 12.8m in diameter, powered by a 28 MW 38,000 HP motor.
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 Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work
JKTech 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
AMIT 135 Lesson 7 Ball Mills Circuits Mining 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 ie
SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21. The largest SAG mill is 42 12.8m in diameter, powered by a 28 MW 38,000 HP motor.
Bonds 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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