Some factors that affect beneficiation of sulphide nickel–copper ores

Sulphide Ni–Cu deposits occur typically in mafic and ultramafic igneous rocks and intrusions. The occurrence of minerals affects the separation efficiency of the sulphides. Coarse grained ores are often relatively easy to process, but some ores have altered in metamorphosis. Disseminated secondary minerals often require fine grinding for mineral liberation. Fine serpentine, however, causes problems in flotation processes, for example, by increasing the viscosity of the pulp. The floatability of minerals also depends on process variables. Process iron is usually in galvanic contact with particles and has an effect on the surface reactions of sulphides. Oxidation and dissolved ions in process water are also essential factors in the flotation processes.