6.1 Introduction ....................................................................................... 153
6.2 Particle size and particle size distribution ............................................. 154
Defi ning the size of a single particle .......................................... 154
6.2.2 Particle size distribution in a population of particles;
defi ning a ‘ mean particle size ’ ................................................... 155
6.2.4 A note on particle shape .......................................................... 160
6.3
Size reduction of solids, basic principles ............................................... 163
6.3.1
Mechanism of size reduction in solids ....................................... 163
6.3.2 Particle size distribution after size reduction .............................. 163
6.3.3 Energy consumption ................................................................ 163
6.4 Size reduction of solids, equipment and methods ................................. 165
6.4.1
Impact mills ............................................................................ 166
6.4.2 Pressure mills .......................................................................... 167
6.4.3 Attrition mills .......................................................................... 168
6.4.4 Cutters and choppers .............................................................. 170
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