Abstract
The effect of microwave radiation and conventional heat treatments of chalcopyrite and pyrite on their magnetic properties was investigated. Magnetic susceptibility of chalcopyrite increased significantly by increasing microwave power and treatment time. Pyrite magnetism was affected only at 500W microwave power. On the other hand, magnetic susceptibility of both chalcopyrite and pyrite increased significantly by increasing heating temperature. X-ray diffraction and XPS characterization showed that the formation of more magnetic phases after chalcopyrite and pyrite treatment is the reason behind their increased magnetism. Dry magnetic separation of individual treated minerals at several magnetic field strengths from 0.5Tesla to 2Teslas was conducted. The results suggest that selective magnetic separation of chalcopyrite from pyrite is possible only in case of microwave treatment due to its selective effect in favor of chalcopyrite at lower power levels compared to pyrite.
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