Hide/Show Apps

Extraction of cobalt and copper from Küre pyrite concentrate

Three methods were investigated for the extraction of cobalt, copper and gold from Kure pyrite concentrate. These were chloridizing roasting, chloridizing volatilization and sulphating roasting processes. For chloridizing roasting, the pyrite concentrate was dead roasted first to adjust sulfur content to about 4%. Then, the pyrite cinder obtained was mixed with NaCl and pyrite concentrate, and roasted to produce soluble chlorides of copper and cobalt. For chloridizing volatilization, copper, cobalt and gold in the pyrite cinder, which contained 0.12% sulfur, were tried to be volatilized as chlorides with the addition of CaCl2. In sulfating roasting, cobalt and copper were tried to be extracted by converting them to their water soluble sulfates. Three different procedures were applied. In the first one, sulfating roasting was done in a closed vessel. In the others, a muffle furnace was used. In the closed vessel experiments and also in one set of experiments in the muffle furnace, the pyrite concentrate was sulfated directly by adjusting the roasting temperature and time. However, in the last set of experiments, Kure pyrite cinder was sulfated by pyrite concentrate addition and roasting in a muffle furnace. In the end, the maximum recoveries were obtained by chloridizing roasting. Although sulfating roasting gave lower recoveries, it was more economical.