Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December 2015 The Bond “Third Theory” of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond and his collaborators were gathering the information to calibrate comminution models
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Get Price2015729grindability is bonds work index which is defined as the resistance of the material to grinding the standard equation used by them for the ball mill work index bond work index is as follows302 1 10 80 10 80 441 g p f w i bg i u 4 in designing and optimizing a milling circuit using bond
Get PriceThe 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 screen
Get PriceBond 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 Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills Various correction factors may have to be applied More
Get PriceLimestone Bond Ball Mill Work Index Bond Mill Work Index Of Limestone dokterolbrechtsbe bond working index or bwi of limestone what is definition of bond milling work index bond method for ball mill work index test with the bonds work index hardgrove index and brittleness tests on six typical rock as a fast method the determination of the bond index from the hardgrove these studies were
Get PriceThe 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 21 mm whereas Ball Mill Work
Get Price322 D Todorovic M Trumic L Andric V Milosevic M Trumic 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
Get Pricethe Bond equation 1961 For every Bond Ball Mill Work Index test carried out at JKTech a standard report is issued The report details the Bond test procedure method and presents the results including F80 P80 Grindability and Work Index Further interpretation of the results is available if required
Get Price3 STANDARD BOND TESTS The Bonds standard ball mill is used to determine the work index value of differ ent samples The Bond work index is defined as the kilowatthours per short ton required to break from infinite size to a product size of 80 passing 100 µm If the breakage
Get Price1 according to Bond 2 n 05 and according to Charles 3 and Stamboliadis 4 n can take any value near these two In the case that the initial size is infinite and the final size is 100 μm then by definition the required specific energy is called work index W i 100 e W i 2 The value of the constant C in 1 can be calculated
Get PriceApr 27 2016 · The ambiguous definition of Bond Maxtons specification of the inside diameter of a wave liner can reasonably result in less than 3 variation in the results of a Bond rod mill work index Final thoughts and recommendations The Author is aware that other comminution consultants will have different opinions Comminution is
Get PriceThe 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 21 mm whereas Ball Mill Work
Get PriceThe grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index Wi This index is determined on a laboratoryscale using a Bond ballmill and by
Get Pricestandard 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
Get PriceThe 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 kWht required to grind to that size Magdalinovic measured the Bond work index of three ore types using different test screen sizes
Get PricePreparation of Test Feed Sample for Bond Work Index Procedure Riffle 810 kilograms of minus half an inch feed into 500 gram charges Riffle one 500 gram charge of ore down to splits of 125 grams each Record the exact weight of one split identify it as Feed No 1 Wet screen through a 150 mesh screen
Get PriceBond 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 Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills Various correction factors may have to be applied More
Get PriceTable 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’ You can find the SG of each mineral samples on the other table Source 1 Table of materials reported by Fred Bond Source 2 Outokumpu The science of comminution Source 3 Equipment and pipelines
Get PriceThe Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions It is a locked cycle test conducted in closed circuit with a laboratory screen
Get PriceSimilar to a Comparative Work Index this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time It can be used at mesh sizes from 65 to 200 mesh normally 100 mesh The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index
Get PriceThe work index W i was defined by F Bond as the specific energy kWhton required to reduce a particulate material from infinite grain size to 100 microns The calculation is based on the sizeenergy relationship 12 21 11 nn eC x which for n 05 x 1 ∞ and x 2 100 by definition gives e ∞100 W i and consequently C 10 W i
Get PriceThe Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test Its value constitutes ore characteristic and is used for industrial
Get PriceThe specification for the apparatus to determining a “Bond” rod mill work index is first described in Bond Maxton 1943 It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load The geometry of the grinding chamber is described as • mill inside diameter of 12 inches
Get Pricebond ball mill work index equation in wills – Grinding Simulation studies on Energy Requirement Work work input and grindability for the ball mill using the above mentioned system standard method of dry grinding Traditional measurements of ore grindability are the Bond Work Index The Bond test equation used by them for the ball mill work index Bond reduction of ores as the power
Get PriceFIGURE 5 BOND ROD MILL WORK INDEX v UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS MPa 5 10 15 20 25 30 35 WiRM metric The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices Figure 5 displays the plot of rod mill Work Index Wi RM versus UCS These
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Get Pricebond ball mill work index equipment – stone crusher for sale bond ball mill work index equipment James Bond – the free encyclopedia James Bond code name 007 is a fictional character created in 1953 by writer Ian
Get PriceBond Ball Mill Work Index Test Standard Pdf Bond Work Index Procedure and Method 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
Get PriceThe 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
Get PriceThe HGI index was found using the calibration chart in Annex A of BS 10161121995 The process was then repeated and the mean of the two determinations rounded to the nearest whole number is the HGI rating for the sample 24 Bond Work Index BWI theory test
Get PriceIntroduction of the Bond work index w i to the above equations Hard ore 180 1961 Medium ore 120 1290 Soft ore 65 0671 Coefficients k Bond work index w i kWhshort ton Denver orehardness Table Relationship between the Bond work index w i and the ore hardness designated by Denver
Get Pricea method using Bond Indices than adding a single factor of 125 to arrive at the AGSAG speciﬁ c energy In 1991 the Canadians developed the SAGPower Index SPI test using 2 kg of material in a 300 mm diameter mill This test has been further developed by Starkey Hindstrom and Orser 2006 This test now includes a Bond Ball mill work
Get PriceI No 2 pp 113125 1988 0892687588 300 000 Printed in Great Britain Pergamon Press plc ERROR ANALYSIS FOR BOND WORK INDEX DETERMINATIONS PART 1 ACCURACY AND REPRODUCIBILITY TE and Dept of Mining Metallurgical Engineering McGill University Que Canada Received 22 July 1987 revision 20 November
Get PricePetcoke Ball Mill Work Index Henan Mining Ball mill bond work index A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore It was developed by Fred Bond in 1952 and modified in 1961 JKMRC CO 2006 This index is widely used in the mineral industry for paring the resistance of different materials to ball milling for estimating the energy
Get PriceThe Bond work index determination according to the standard Bonds test is done on all these samples with comparative sieve size of 74 105 and 150 microns The Bond Work Index is calculated using the formula Bond 1961 √ √ 1 where W i – Bond work index kWht P c – test sieve mesh size µm G – weight of the test sieve
Get PriceW i 100 C s 3281 D 033 where F80 feed size 80 passing μm sg specific gravity of ore feed Wi feed ball mill work index kWht D the inside diameter of the mill m C s critical speed Cs is 135 rpm k a constant designated as the mill factor 350 The maximum ball size was calculated 30 mm
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