Classification

Classification is a method of separating of minerals into two or more products on the basis of size. In coarse size range this may be achieved under dry conditions. However, starting from grinding most operations are generally performed under wet conditions in mineral processing.
When a solid particle falls in fluid (water) medium there is resistance to this movement and the value increases with velocity. When equilibrium is attained between the gravitational and fluid resistances forces, the body reaches its terminal velocity and thereafter falls at a uniform rate. This terminal velocity is function of the particle size and density.