Jun 01, 2020 · Electrostatic separation enables the separation of a wide range of minerals and this example, separating Pyrite from Silica Sand, provides a good example of the separation process. A feed of conducting (Pyrite FeS 2 ) and nonconducting (Silica Sand SiO 2 ) powders is fed via a vibratory feeder onto an earthed, stainlesssteel roll revolving at ...