The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μm is________________?
Correct answer: C. 18 kWh/ton
- A. 6.35 kWh/ton
- B. 9.0 kWh/ton
- C. 18 kWh/ton
- D. 25.4 kWh/ton
Explanation
Bond's law gives energy proportional to 1/√P, so reducing the product size from 100 to 50 μm increases the energy by √(100/50) = 1.414. Thus, 12.7 × 1.414 is approximately 18 kWh/ton.
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