Which of the following equations is Rittingers crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D? sa & D? sb = volume surface mean diameter of feed & product respectively) ?
A. P/m = K/ ?Dp
B. None of these
C. P/m = K . (1/ D? sb 1/D? sa)
D. P/m = K . ln D? sa/D? sb
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