There are two distinct methods for separation of particles based on size: screening and classification.
The size distribution of the particles must be controlled for a number of reasons at various stages of a mineral processing plant:
To enable undersized material to bypass the crushing or grinding circuit and to retain oversized particles for further size reduction,
To provide an optimum particle size material for efficient processing in the downstream separation and concentration systems, and
To prepare product that meets particle size specifications required for the market place.