Thermoanalytical studies on copper-iron sulphides

The direct production of copper sulphate from copper ore is an important ro ute to recover copper. The condition, however, is dependant on temperature and sulphatising environment. The oxidation of chalcopyrite in static air b ed condition has been studied by TG/DTA and DSC techniques. The addition of catalysts, improved the sulphation by in-situ producing better conditions. The mutual effects of sulphides were further confirmed by studying the oxi dation reaction on pure copper-iron sulphides and results so obtained were corroborated with X-ray diffractrograms. With only chalcopyrite a mass gain of 8% (TG) corresponding to copper sulphate formation was observed, in the temperature range 628-738 K. The TG plots showed respective mass gain of 1 4, 17 and 12% in presence of Fe2O3, Na2SO4 and FeSO4 with chalcopyrite in t he wider temperature range 628-923 K. As such the cupric sulphide had a neg ligible tendency of sulphation, which increased with the addition of ferrou s sulphide mixture under the temperature range studied. At higher temperatu re copper ferrite formation was found.