【Abstract】 This paper briefly describes the studies on roasting copper-cobalt complex sulphides. The concentrate contains 1.5% Cu, 0.13% Co, 42.76% Fe, 43.93% S. The sample was roasted with added sodium sulphate in laboratory pipe-furnace (18x 180mm) under controlled temperature and atmospheric conditions. The effect of parameters such as temperature (610—720℃), time (45—90min), and amount of sodium sulphate (1—5% of fresh sample) on the extraction of copper, cobalt and iron was studied. The recovery of copper and cobalt was found to be 95% and 85% respectively. The studies show that at higher temperature, the dissolubility of iron decreases. Furthemore, with the increase of addition of sodium sulphate, the dissolubility of iron increases.In order to accelerate the speed of desulphurization and improve the quality of exhaust-gas,two-stage roasting operation was also studied. Sample was roasted first at higher temperature such as 800℃, 850℃ or 900℃, then the mixture of roasted and fresh sample was roasted at 650℃. The operation of two-stage roasting has resulted in bringing extraction of iron down to about 1% in the leaching process without much affecting the recovery of other metal values.Both the leaching residues of one-stage and two-stage roasted samples can be utilized as concentrates of hematite (Fe2O3), leaving no useless waste.更多还原