4 high ball charge sag mill or rom ball mill 15 to 25 ball charge low competency ore hidden valley nzema sepon ug2 ores south africa yanacocha 5 low ball charge high speed sag mill 4 ball charge 90 nc a cross between ag and sag for average competency abrasive ores typically operated in rsa on witwatersrand gold ore driefontein.
Ball 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
Ball mills are predominantly used machines for grinding in the cement industry although ball mills the mill was operating at an average output of 135 th opc and specific power consumption of • empty heights of both the chambers measured to calculate the ball charge
Calculating steel ball charge in ball mill calculation of ball mill charge volume ball mill filling calculation how to charge ball in cement mill the raw mill will be operate with a much coarser ball charge than the cement mill mainly because of the bigger slot sizes of the partition wall the transition zone consists of 50 mm and 60 mm balls the basis is a 50 mm ball
Charge should always be 50 material charge will vary from 25 to 40 or more in some cases such as when grinding 100 homemade airfloat charcoal the best way to tell if
Contact ball charges this calculator gives the surface and the average weight of the ball charges it gives also a rough interpretation of the ball charge efficiency ball top size bond formula calculation of the top size grinding media balls or cylpebs modification of the ball charge this calculator analyses the granulometry of the material inside the mill and proposes a modification of the ball charge in order to improve the mill
Dec 01 oembsd on the contrary is recommended by the manufacturer of the ball mills operating at tutuka power station these two ball mixes are used to predict and validate the ball size distribution model so as to be able to describe any other charge the monosized ball data helps develop a ball size effect
In the ball mill measurement by mcp resulted in a charge level of 270 the measurements conducted with s width presented a wide variability with an average of 307 that could be between 279 and 342 with 90
Mill diameter mill length grates openings and pebble ports size the power equation is also function of all the operational variables selected for this study the applied force is a function of the mass inside the mill and it is composed of balls ore and water the ball charge is a function of the bulk fraction of the sag mill volume
Mill speed no matter how large or small a mill ball mill ceramic lined mill pebble mill jar mill or laboratory jar rolling mill its rotational speed is important to proper and efficient mill operation too low a speed and little energy is imparted on the
Mill type ball mill engineering design number of trains 2 engineering design number of mills 4 calculations mill size dia mm x egl mm x tbc by suppliers drive kw tbc by suppliers bond work index ball mill design kwht 160 testworkengineering design average tonnage rate each th
The ball charge is determined by the operator targeting the balance between grind and throughput the higher the ball charge the more aggressive the milling becomes with softer oxide ores lower ball charges are usual however the harder sulphides does need more media energies to meet the p80 target and an acceptable
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