The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bonds law) of the energy to grind the particles from a very large size to 50 ?m is________________?
A. 6.35 kWh/ton
B. 25.4 kWh/ton
C. 18 kWh/ton
D. 9.0 kWh/ton
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