The Bond Index conforming ball charge consists of 43 x 145 balls 67 x 117 balls 10 x 1 balls 71 x 075 balls 94 x 061 balls 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 20125 grams The grinding jar of the Bond Index Ball Mill measures 12 x 12 and has well
Get PriceThe Bond Index conforming ball charge consists of 43 x 145 balls 67 x 117 balls 10 x 1 balls 71 x 075 balls 94 x 061 balls 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 20125 grams The grinding jar of the Bond Index Ball Mill measures 12 x 12 and has well
Get PriceThe FC Bond Work Index Test Ball Mill was designed by F C Bond for use in determining the Bond Index a measure of grindability and power required for grinding applications The FC Bond Mills are used in laboratories throughout the world
Get PriceCleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done Add about 500 g of silica sand into the mill containing the ball charge Seal the mill Rotate for 20 revolutions to clean Empty the mill charge and sand into the ball try once grinding is complete Clean out
Get PricePlace Material Charge and Ball Charge in Mill Run x revolutions x number of revolutions based on estimate of work index usually 50 100 150 or 200 revolutions Dump Mill separate balls and Material Charge Screen all the material at Mesh of Grind Weigh Product Product weight of Material Charge weight of Screen Oversize
Get PriceThe Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill with a predefined media and ore charge The test requires a minimum of 10kg of sample that has been stagecrushed to 100 passing size of 335 mm Any screen size below 600m can be used for the testwork depending on your requirements
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
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 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 335 mm as required for the Bond Ball Mill Work Index test feed
Get PriceThe Bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the Bond work index The test is a lockedcycle test where ground product is removed from test cycles and replaced by fresh feed
Get PriceThe Bond Index Ball Mill is supplied standard with a barrel and rotating yoke assembly and the electric motor drive with a standalone bench funnel and screen Safety is a prime consideration for all Alsto equipment and the Bond Index Ball Mill is supplied equipped with acoustic enclosure
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
Get PriceBall 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
Get PriceOct 19 2017 Lets sum up The grinding balls diameter determined by the Bond formula has a recommendatory character and serves as a starting point for calculating the necessary proportion grinding media feeding a new mill More precisely adjust the ball load in
Get PriceThe 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 m If the breakage characteristics of a material remain constant over all size ranges the calcul ated work index would be expected to remain constant since it indicates the
Get PriceBall mill A typical type of fine grinder is the ball mill A slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls Ball mills normally operate with an approximate ball charge of 30
Get PriceThis data is all obtained from doing Bond BM Wi tests on SAG ground ore In Table 6 below it is seen that the Crushed Bond Ball Mill Wi test gives a lower result than when the ore is ground in a SAG mill For Tenke samples the average difference was 09 kWht higher for the SAGDesign Bond test
Get PriceThis index is determined on a laboratoryscale using a Bond ballmill and by simulating dry grinding in a closed circuit until the 250 circulating load has been obtained
Get Priceindex in a ball mill BBWI which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials Austin et al 1981 Ahmadi and Shahsavari 2009
Get PriceThe Bonds BallMill Work Index is a measure of the resistance of the material to grinding in a ball mill This Index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup
Get PriceFirst a Jar Mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net Hphrt to grind from the design feed size to the required product size The second test a Bond Work Index determination results in a specific energy value
Get PriceUse of Work Index Since its introduction in the 1960s the Bond Ball Mill Work Index BBMWi parameter has been extensively used in predicting ball mill power draw Along with comminution circuit design the work index parameter is widely used in tracking mill performance Due
Get Pricegrindability 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 follows 230 82 1 10 80 10 80 445 1 P G P F W i bg i u 4 In designing and optimizing a milling circuit using Bond
Get PriceAccording 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 3327 mm
Get PriceThis Work Index Ball Mill additionally called plant for measuring bond work record is a key gadget for measuring granulating work list It is broadly utilized by showing
Get PriceA 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 comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup
Get Priceare the Bond Work Index Wi values Bond 1952 divided into a low energy crushing work index Wi C for coarse rocks 7550 mm a rod mill work index Wi RM for intermediate sized particles 253 mm and a ball mill work index Wi BM for small particles 3 mm Ammtec 2000 Laboratory
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
Get PriceOct 15 2015 The Bond Work Index BWI or Wi is defined as the calculated specific energy kW ht applied in reducing material of infinite particle size to 80 passing 100 m 25 The higher the value for Wi the more energy is required to grind a material in a ball mill 10 26
Get Priceusing Bond rod mill work index RMWI and Bond ball mill work index BMWI However the author has developed a relationship between the Bond third theory SE values and the AGSAG SE values to enable the additional power required for AGSAG milling to be determined AGSAG inef ciency varies according to the transfer size
Get PriceThe amount of feed was set at 1175 g which was proportional to industrial scale The ball mill speed was constantly set at 768 Cs Experiments were conducted at different ball sizes between 20 and 40 mm grinding time 1030 min solids content 6580 and work index of copper sulphide ore 12154
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