5. Dry gravimetric concentration
The separation of minerals according to their density can be achieved using air as the particle suspension fluid. However, this is only a marginal concentration route when it comes to equipment selection, and adoption of these methods remains limited. The subject has often been underestimated by technicians, researchers and operators. The result is a very imperfect knowledge of the principles and mechanisms governing pneumatic gravimetric separation, which is still very much empirical rather than theoretical. Pneumatic separation has a long history, mainly in agriculture, where winnowing is a typical example.
5.1 Principles
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Dry gravimetric concentration
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