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contact usBond Work Index Test Ball Mill US 13000 The FC Bond Work Index Test Ball Mill was designed by F C Bond for use in determining the Bond Index a measure of
It is broadly utilized by showing and investigating divisions for grind ability test The Work Index Ball Mill is a flat round and hollow turning gadget external apparatus
Learn MoreTable 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 Andesite 201 183 201 195 Basalt 189 171 188 190 190 Coke Petroleum 745 Emery 625 567 625 625 Fluorspar 119
Learn MoreThe 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
Learn MoreBond Ball Mill Grindability Test The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stagecrushed to 100 passing size of 335 mm Any screen size below 600µm can be used for the testwork depending on your requirements
Learn MoreThe 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
Learn MoreBall 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
Learn MoreBall 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
Learn Moreindex in a ball mill B BWI which is based on a first order k inetics present in the Bond ball mill for grinding mineral raw materials Austin et al 1981 Ahmadi and Shahsavari 2009
Learn MoreW is the work index measured in a laboratory ball mill kilowatthours per metric or short ton P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers Rod mill A rotating drum causes friction and attrition between steel rods and ore particles
Learn MoreInsmart Bond’s 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
Learn MoreSimilar 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
Learn MoreThe aim of this study was to develop a new method for assessing the Bond work index 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 Theoretical basis of quick procedure
Learn MoreKinetic grinding test approach to estimate the ball mill work index Jul 31 2015 a new approach toward estimating the Bond ball mill work index BBWI by of different ores and materials such as copper iron and clinkers
Learn MoreInsmart Bond’s 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
Learn Morework indices for the AGSAG mill and ball mill can be reorganised as 7 and 8 where B’Wio and A’Wio are the corrected operating work indices and WAGSAG WBM are the respective power draw of AGSAG and ball mills Note that the ball mill operating work index is applied only on the portion that needs the additional grinding Q2
Learn MoreOre samples from Copper Mountain and New Afton mines were used for the Bond ball mill work index tests conducted at the University of British Columbia’s CMP laboratory The first sample is a composite of four Copper Mountain’s geounit samples with similar alteration AlbitePotassicArgilic sampled at different pit locations and benches
Learn Moreare 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
Learn MoreThe Work Index Ball Mill is used to find Grinding work index referring to the grindability index of Ores it indicate the grinding difficulty of the material It is measured according to the principle that to calculate the grinding work index based on output of each revolution of the mill after the material is ground to a balanced state by the specified mill
Learn MoreAccording 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
Learn MoreThe 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 characteristics of a material remain constant over all size ranges the calcul ated work
Learn MoreThe 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 10–30 min solids content 65–80 and work index of copper sulphide ore 12–154
Learn More22 Ball 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 set to 70 RPM 1667 Hertz corresponding to 85 of the critical frequency The mill power is P 162 Watts
Learn MoreBecause of the difficulty in determination of this index alternatives to the standard method have been developed by many researchers Vedat and Huseyin 2003 In the determination of ball mill work index 15 kg of representative ore at 100 335 mm is crushed to 100 − 335 mm Amtech 2006
Learn MoreBall Mills are generally used to grind material 14 inch and finer down to the particle size of 20 to 75 microns To achieve a reasonable efficiency with ball mills they must be operated in a closed system with oversize material continuously being recirculated back into the mill to be reduced
Learn MoreA ball mill is a type of grinder used to grind blend and sometimes for mixing of materials for use in mineral dressing processes paints pyrotechnics ceramics and selective laser sintering It works on the principle of impact and attrition size reduction is done by impact as the balls drop from near the top of the shell A ball mill consists of a hollow cylindrical shell rotating about its axis The axis of the shell may
Learn Morerod mill work index has not been de ned as yet The ball ﬁ mill work index is con rmed at 16 kWht The operating ﬁ work index though is in the range of 21 kWht to 25 kWht showing high inefﬁ ciency This raises the point that in some cases the Bond EF4 oversize factor calculation is
Learn MoreNumerically the work index is the energy required in kwht to reduce a given material from theoretically infinite feed size to 80 passing 100 micronshe work index of a particular material is determined in the laboratory by conducting the standard bond grindability test bond developed separate tests for the rod mill and the ball mill
Learn MoreA 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
Learn MoreAt 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 Index BWI is used for the range from 21 mm down to 100 µm Adjustment of grinding parameters
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