Energy savings ranging from 10 to 50 per cent compared to grinding by conventional ball and rod milling or semiautogenous grinding SAG with ball milling have been achieved Daniel et al 2010
Get DetailsStandard Bond ball mill grindability and batch grinding tests were carried out The Standard Bond ball mill grindability tests were carried out on crushed 335 mm ore samples 18 using a 106 micron closing screen Batch grinding tests were conducted on all magnetite concentrates and tails 36 samples total and in addition three ore samples
Get DetailsComparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project John Starkey1 Principal Consulting Engineer David Meadows2 Manager Mineral Processing Development 1 Starkey Associates 344115 George St Oakville ON L6J 0A2 PH 416 7357512 Email y 2 Phelps Dodge Corporation
Get DetailsThe 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
Get Detailsby a ball mill in series Crusher product 9 mm is fed to the rod mill and the water is fed in ratio to the ore feed mass The rod mill discharge is pumped without any further water addition to the first ball mill The ball mill discharges to a sump where water is added before the slurry is pumped to the first cyclone Cylcone 1 See
Get Detailsmill commonly found Grinding mills Ball mills Ball mills vary in their details and size but the basic design consists of a horizontal hollow cylinder with an abrasionresistant interior that rotates about its central axis The grinding is performed by stone metal or rubber balls that are free to move in the cylinder Figure 1
Get DetailsThe SAG mill was designed to treat 2065 t h 1 of ore at a ball charge of 8 volume total filling of 25 volume and an operating mill speed of 74 of critical The mill is fitted with 80 mm grates with total grate open area of 766 m 2 Hart et al 2001
Get DetailsThe ball size factor F B is added to the mall shaft power for mill sizes greater than 33 metersFB 1102 dmax 125D 508 kWt Other Rowland Kjos Power Draw Corrections F 1
Get DetailsBall mills are commonly used in the manufacture of Portland cement and finer grinding stages of mineral processing one example being the Sepro tyre drive Grinding Mill Industrial ball mills can be as large as 85 m 28 ft in diameter with a 22 MW motor 4 drawing approximately 00011 of the total worlds power see List of countries by
Get DetailsOLD ORE GRINDING MILLS Stamp Mills Although the stamp mill could be classified as a fine crusher it is included in this chapter as its usual duty corresponds approximately to that of a primary ball mill Stamp mills were built to parallel the operation of a mortar and pestle working continuously and on
Get DetailsComparative grinding tests of twostage closed HPGR with 7 mm and 1 mm screens and a final mill grind and twostage closed HPGR with a 7 mm screen and an air classifier cutting for final product
Get DetailsBall Mill Wio BWio 86 Circuit Wio OWio 146 Bond Ball Mill Work Index BWi kWht 134 Bond Rod Mill Work Index RWi kWht 181 Table 1 Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on
Get DetailsIntermediate and fine size reduction by grinding is frequently achieved in a ball mill in which the length of the cylindrical shell is usually 1 to 15 times the shell diameter Ball mills of greater length are termed tube mills and when hard pebbles rather than steel balls
Get DetailsBall Mill We are a leading Manufacturer of batch ball mill ceramic batch ball mill rod ball mill iron ore grinding ball mill ball mill for dolomite and ball mill from Ahmedabad India
Get Details21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ballmill power drawP as a function of its dimensions internal mill diameter D and length L zthe ballmill power drawP as a function of the feed D f mm and the product size d mm the Bond work index w i kWhshort ton and the mill throughput T short tonh zthe ballmill dimensions D and L when
Get DetailsWithin the mineral processing industry a range of grinding conditions exists which include semiautogenous grinding SAG rod milling and conventional ball milling Each of these mill environments presents a unique environment for grinding media requiring the application of specific physical and chemical properties for optimum grinding media performance
Get DetailsThe laboratory ball mill was designed for grinding limestone meaning that the work index required for the specific power calculation was assumed to be the work index of limestone which is 116 KWht with a specific gravity of 26 gcm 3 or 2600 kgm 3 The feed size F 80 of the ball mill was assumed to be 2 mm 2000 microns
Get DetailsThe geometry of a mill with conical ends is shown in Figure 86 The total volume inside the mill is given by Vm 4 D2 mL 1 2Lc L L 1 DtDm 3 1 DtDm 816 The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill
Get Detailsthe speed of the ball mill the operator has suddenly a new possibility the speed of the ball mill can be reduced to such a low level that no grinding is taking place the balls and the ore are just tumbling but the ball mill remains in operation Whenever the ore feed to the ball mill is recovered again then the ball mill
Get DetailsFigure 1 IsaMills in the Regrind Circuits at the Mount Isa Mines LeadZinc Concentrator The IsaMill is a horizontal high speed stirred mill that operates with very high power intensities up to 350 kWm3 In comparison the power intensity of a ball mill is about 20 kWm3 The high
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