calculation of energy required for grinding in a ball mill. int. j. miner. process., 25: 41-46. the bond work index, wi, as an indicator of the grindability of materials is not a material constant but rather it changes with change of size of the grinding product.
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ball mill design/power calculation the basic parameters used in ball mill design power calculations , rod mill or any tumbling mill sizing are; material to be ground, characteristics, bond work index, bulk density, specific density, desired mill tonnage capacity
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figure 8.4 the effect of mill speed on the power dn by a rotating mill. the liner profile and the stickiness of the pulp in the mill can have a significant effect on the actual critical velocity. mills usually operate in the range 65 - 82% of critical but values as high as 90% are sometimes used. a crucial parameter that defines the performance of a
if p is less than 80% passing 70 microns, power consumption will be ball mill power calculation example 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
the critical speed of a rotating mill is the rpm at which a grinding medium will begin to centrifuge, namely will start rotating with the mill and therefore cease to carry out useful work. ball mills have been successfully run at speeds between 60 and 90 percent of critical speed, but most mills operate at speeds between 65 and 79 percent of critical speed.
re calculation of ball mill grinding efficiency i never hear about grinding efficiency and it will depend on % of load, velocity across the mill, blain, separator efficiency , recirulation load , specific power consumtpion etc, .. by bk reply
calculation of the power d of dry multi-compartment ball mills 229 in order to design a ball mill and to calculate the specific energy of grinding, it is necessary to have equation s law which relates mill power and mill size and mill operating conditions.
bond work index formula-equation. see this useful summary table of bond work index by minerals. for any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um.
zfrom the distribution of the points around the line of comparison the good agreement of the results received is obvious. 0 200 400 600 ball mill power d predicted from the denver slide rule, kw 0 200 400 600 calculated ball-mill power d from the m odel derived, kw. data compared line y=x. fig.
if you get your o power to level 3 or 4, your o power charges will be nearly full/completely full after the set of fights, even if you use it on yourself. even at level 1, there wont be
the power calculated on using equation 1, bond, 1961; rowland and kjos, 1978 , relates to: 1 rod milling a rod mill with a diameter of 2.44 meters, inside new liners, grinding wet in open circuit. 2 ball milling a ball mill with a diameter of 2.44 meters, inside new liners, grinding wet in open circuit.
if you get your o-power to level 3 or 4, your o-power charges will be nearly full/completely full after the set of fights, even if you use it on yourself. even at level 1, there wont be any more than a few minutes break inbetween fights when your o-power is completely gone. the exp is also greatest in doing triple battles.
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