20151216work 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 millsote that the ball mill operating work index is applied only on the portion that needs the additional grinding q2,.
20151216work 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 millsote that the ball mill operating work index is applied only on the portion that needs the additional grinding q2,.
An alternative mill ball charge is proposed that closely approximates bonds original total ball mass, number of balls and ball surface areaesults of 30 bond work index tests of six pure materials calcite, magnesite, labradorite feldspar, quartz, andalusite and glass using closing screen apertures p 1 values of 500, 250, 125, 90 and 63.
20131224vol noalternative approaches for determination of bond work index 733 where h is the hardgrove index and mh is the mass in gm of the particles smaller than 74 mhe mean of two to three parallel measurements are to be considered.
20161227micrometers in sizeccording 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, 1961he test is performed on a raw material approximately weighing 10 kg, which coarseness is 100 37 mm.
Bond ball mill work index, bwi, kwht optimum use of power in grinding, both in terms of grinding efficiency and use indices calculated for agsag sectionsond work index formulaequation 911 metallurgistdetermination of the bonds work index of baban tsauni european.
Comparison of ucs to bond work indices alex doll, alex g doll consulting ltd, edmonton, canada derek barratt, djb consultants inc, north vancouver, canada ken wood, fluor mining minerals, vancouver, canada abstract unconfined compressive strength ucs is a commonly used rockmass strength measurement used by.
2018220rod mill work index has not been de ned as yethe ball mill work index is con rmed at 16 kwhthe operating work index, though, is in the range of 21 kwht to 25 kwht showing high inef ciencyhis raises the point that, in some cases, the bond ef4 oversize factor calculation is not suf cient to compensate.
2017132 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.
2019515w 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 micrometersod mill rotating drum causes friction and attrition between steel rods and ore particles.
2014101bonds approach consists of determining the ore hardness characteristics, or work index wi via standardized laboratory testworkhe 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.
The d80 of ore reached to 480 m in all samples to prepare materials for ball mill grinding experiments, because d80 of plant ball mill feed in sungun plant was 480 ms a base for this study, standard bond grindability tests were initially done and bond work index wi.
Bond fcrushing tests by pressure and impact, trans aime, vol 169, 1947, pp 5866ond rod mill grindability testhe 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.
Comparing of ball mill design using bond work index kroll institute of extractive metallurgy colorado school of mines mryrel jacobsen drorby gnderson.
201797bonds work index which is defined as the resistance of the material to grindinghe standard equation used by them for the ball mill work index bond work index is as follows f 80 80 0 0 10 441gp w i bg i 4.
Bond work index ball mill design and safety factorshat is a ball mill work index for sand youtubeul 26, 2015 bonds work indexball mill , procedure for ball mill work index.
2018220mill ball mill closed circuit crushing to 16 mm open circuit 8 diaod mill to 1 mm closed circuit 8 diaall mill to p80 um the ore test work index circuit operating work index 9 the standard bond circuit coarse ore bins fine ore bins screen crushing screen classification rod mill ball mill this is the reference basis for all work.
Numerically, 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 testond developed separate tests for the rod mill and the ball mill.
201658bond ball mill work index in india dailymotionor you exploreo you want to remove all your recent searches all recent searches will be deletedancel removeign inatch fullscreen bond ball mill work index in indiandia years ago 1 viewond ball mill work index in india.
2018626the ball mill specific power consumption e ball is determined by deducting a cone crushing component from the bondrowland e ssbm specific power consumptionee the base formulae in the bond ssbm modelhere cf is the essbm calibration factor in the circuit settings for ball mill operating work index.
Rittingers, kicks and bonds laws express work input as work index w i times a particle size functiont is proposed that these laws are only particular cases of more general expressions having the particle size function raised to an exponent, i, the work exponent w e.
2015416table i shows the bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after limshe concentrate weight recovery was in the order of 5060urthermore it may be observed that the bond ball mill work indices for the ore wi varies from 14to 20kwht.
201955the bond ball mill work index test is thought to be additive because of its units of energy nevertheless, experimental blending results show a nonadditive behavior18 the spir value is known not to be an additive parameter, however errors introduced by.