Effect of Mill Diameter on Grinding Efficiency

EF3 – Diameter Efficiency Factor – using the base mill diameter of 2.44 meters (8’) inside liners, the diameter efficiency factor can be calculated from the followings:

Table 2 gives a tabulation of the EF3 factors for some of the more common mill diameters in both the imperial and metric measuring systems.
           
TABLE 2: DIAMETER EFFICIENCY MULTIPLIER

Should be noted that mills where the diameter inside liners is larger than 3.81 meters (12.5’) that the diameter efficiency factor does not change and remains 0.914.

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