4. Treatment of fine particles (< 100m)

Readers are invited to consult the bibliographical references at [14][15][16][17][18][51] .

Below 100 µm, the forces brought into play by gravity rapidly diminish, and those due to fluid dynamics quickly take precedence, resulting in a significant loss of efficiency and yield for the equipment described above. It is therefore necessary to design other equipment that can extend gravimetric recovery to fine particle sizes. The last twenty years have seen the emergence of equipment based on :

• discontinuous unidirectional...