reduction ratio in ball milling

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Factors Affecting Ball Mill Grinding Efficiency

The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a Mill Geometry and Speed Bond 1954 observed grinding efficiency to be a function of ball mill diameter and established empirical relationships for recommended media size and mill speed that take this factor into account.

Quantifying Grinding Efficiency Grinding and Classifi ion

EF7 Low Ratio of Reduction Ball Mill the need to use this factor does not occur very often as it only applies to ball milling when the Ratio of Reduction is less than 6. This shows up particularly in regrinding concentrates and tailings. The equation for this is:

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Reduction Ratio an overview ScienceDirect Topics

The speed reduction ratio of the gearbox is found from the diameters of its gears as given in the following formula typical values are about 30:1 i.e. the highspeed input shaft turns at a speed about 30 times higher than the slowspeed output shaft. 3.90 Z D sl D hi D ii D io. where:

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REDUCTION RATIO FOR BALL MILLING Crusher Mills Cone Archive of SID. The average values of reduction ratios for rod and ball mills were equal to 64.65 and 1.15 with standard deviation of 3.91 and 0.03 respectively.


volume ratio of grinding ball in ball mill. average volume of a ball mill. the average reduction ratios in rod and ball mills were 64 ball to 4451 of the ball mill volume can get the ideal grinding .


Size reduction is achieved by impact of the balls when they dropfrom near the top of the shell Energy consumed in lifting the balls is utilized for grinding job When the ball mill is rotated the balls are carried by the mill wall nearly to the top

Best way to determine the balltopowder ratio in ballmilling

The maximum power draw in ball mill is when ball bed is 3540 by volume in whole empty mill volume. Considering that ball bed has a porosity of 40 the actual ball volume is considered to be

Optimum choice of the makeup ball sizes for maximum

As the size reduction ratio increases the optimum ball ratio moves towards more small balls. At the finest grinding with a size reduction ratio of 128:1 Fig. 7d a 50.8 mm/25.4 mm ball mix at a 13:87 ratio was found to be the optimum mix. This indi es that the finer the product size the higher the proportion of smaller balls that is required.

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