Mechanical Operations
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

9.0 kWh/ton
6.35 kWh/ton
18 kWh/ton
25.4 kWh/ton

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Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

All of these
American standard screens (ASTM and Tyler standard screens)
British standard screens
German standard screens (DIN 1171) etc

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