Abstract

Tests with a roll type electrostatic separator have shown that the separation of minerals is affected by the material from which the roll is constructed as well as the surface finish of the roll. Experiments have been carried out with single mineral species on roll constructed of titanium, chromium–plated mild steel and aluminium with differing surface finishes. The results indicate that the surface finish influences the separation of the minerals. The effect is attributed to alteration either to the field configuration in proximity of the roll or to the particle–roll capacitance resistance.