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Jktech laboratory services bond rod mill index test brmwi a bond rod mill index test brmwi is a standard test for determining the rod mill work index of a sample of brmwi is a measure of the resistance of the material to crushing and can be used to determine.
Lg a mill power equation for sag and metallurgical 1990 power no load power net power drawn by the charge the net power is calculated from net power e in equation, d is the diameter inside the mill liners and le is the effective length of the mill including the.
The bond formula equation 2 was used to calculate the required power for both compartments rod and ball for each include power to maximize the feed rate of the mill while achieving a p 80 of 300 m, available power 401 kw for rod and 753 kw for ball and reaching an optimal transfer size between the compartments.
Table 1 bond mill charge distribution ball diameter, inch balls distribution, 1 25 1 39 1 60 78 68 34 93 the standard bond grindability test is a closedcycle dry grinding and scree ning process, which is carried out.
The bond work index of lizenithne and andesite of the grinding products and circulating mill charge were the most of energy for ore grinding to the is found in a laboratory bond ball mill by mixtures grinding in a ball mill.
Throughout the batch grinding tests, the power draw of the mill was measured using a purpose built power meter to facilitate the calculation of specific grinding table 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 concentrate weight.
Grams per revolution gbp is the ball mill ball mill work index, wi kwhshort ton is calculated from the following equation bond 19611 the mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or fc bond ball mill.
Bond rod mill grindability 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 correction factors may have to be test is a closedcircuit dry grindability test performed in a standard rod mill.
Power according to the bond third theory mill and agsag mill products are similar and tend to be not as steep as a slope when plotted on loglog is because the particle size distribution psd, these mills produce have a coarse fraction but also a ne fraction which is.
This equation reverts to the bond equation equation by taking the value of b as 12 and integrating thus, e k 1 p 6 12 1 f 6 12 which in effect is the bond original work on establishing the energy for size reduction was established in a m 8 foot internal diameter wet grinding overflow type ball mill.
The rowland and kjos equation indicates that power draw is a function of the fraction of the critical speed for the quantified the rod mill power draw as a function of the work index, capacity, and a series of correction 135 lesson 8 rod mills.
Measurement of electrical energy consumption in a bond ball various mill power models, dem and bond backcalculation work index and third theory equation.
How to calculate bond mill work index work index this useful summary table of bond work index by 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.
A public database of tumbling mill grindability measurements and their relationships alex doll1, alex consulting abstract this work presents a public database of over 800 grindability measurements and a set of equations for converting between different grindability tests based on this laboratory.
Figure power variation with mill speed for different media shapes figure power variation with mill speed for different media shapes figure power variation with mill speed for different media shapes figure variation of mill power draw with mill filling, j cylpebs
Bond work index formulaequation basic equationssize distribution and exposure ratioequations for work index variationswork index and crack energythe basic index equation isw 10 wip 10 wif1where w is the input required in kilowatt hours per short ton to grind from 80 passing f microns to 80 passing p microns, and wi is the index, or the grinding resistance parameter.
Bond tests mining sgs bond, crushing tests by pressure and impact, trans aime, vol 169, 1947, pp rod mill grindability test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power.
The method is used to size a cement ball correction factors are applied with the bond method is valid both for clinker grinding and for raw materials method only gives a rough and initial idea for sizing a cement ball mill.
Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills can be calculated from mp.
Grinding mills how to accurately predict their power draw mill power equation was bonds equation, without its speed correction.
Bond expressed mill capacity as a function of mill shaft power pm, kw and the energy required for particle breakage kwhfq pm e the expression for mill shaft power developed by bond incorporates a number of operating parameters, the energy required for breakage was previously discussed,,e wi10 p80 10 f80.
Grindability is bonds work index which is defined as the resistance of the material to standard equation used by them for the ball mill work index bond work index is as 1 10 80 10 80 g p f w i bg i u 4 in designing and optimizing a milling circuit using bond.
An updated data set for sag mill power model calibration this paper expands the sag mill survey database published by the author at procemin new database includes 49 published sagag mill surveys and includes mills from all over the world.
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