21. A pebble mill
22. A propeller agitator
23. In a roll crusher, both the rolls
24. 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 μrn is
25. Screen capacity is expressed in terms of
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