The work index depending on the grind size in this way work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation this study was carried out in a standard bond ball mill 305 ,Work index ball mill.
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The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 336 mm 6 mesh to product size in the range of 45150 m 325100 mesh thus determining the ball mill work index wi b or bwi the work index calculations across a narrow size range are conducted using the appropriate laboratory work index determination for the material size of interest or by
More DetailsIt 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
More DetailsThe 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
More DetailsThe bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a nonadditive behavior the spir value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant
More DetailsThe ball mill work index is con rmed at 16 kwht the operating work index though is in the range of 21 kwht to 25 kwht showing high inef ciency this raises the point that in some cases the bond ef4 oversize factor calculation is not suf cient to compensate for the milling inef ciencies that arise
More DetailsSimilar 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
More DetailsUsing a novel ring mill a laboratory ball mill a labora tory rod mill and the semi continuous process using the same rod mill as described below in all cases the min a new approach to the calculation of work index and the potential energy of a particulate material
More DetailsBall mill work index adjustment the bond ball mill work index test requires the operator to select an appropriate screen size to close the test the procedure states that the closing screen size should be such that the product size of the test is the same as the expected product size of the operating plant
More DetailsAccording 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
More DetailsBond 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 600m can be used for the testwork depending on your requirements
More DetailsThe standard bond ball mill grindability test determines the ore grindability g rev1 and work index on an ore which gives the ball mill power consumption
More DetailsComparative testing program for the original bond ball mill test showing range of results against ususal range of bbmwi values measured the jkbbm test requires less material compared to the original test jktech recommends 5 kg for test work compared to 10 kg for the original test similarly the
More DetailsRod mill work index is used in the bondbarratt specific energy consumption model the work index is used to calculate the energy requirement to grind rocks in the medium size range from 10 mm 20 mm down to about 2 mm
More DetailsAre 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
More DetailsThe 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
More DetailsBond 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
More 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 inch 6350 microns the required product size distribution is to be 80 passing 100 mesh 149 microns
More DetailsWork indices for the agsag mill and ball mill can be reorganised as 7 and 8 where bwio and awio 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
More DetailsRod mill work index has not been de ned as yet the ball mill work index is con rmed at 16 kwht the operating work index though is in the range of 21 kwht to 25 kwht showing high inef ciency this raises the point that in some cases the bond ef4 oversize factor calculation is
More DetailsIndex 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
More DetailsTable 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
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