| The reduction roasting behavior of chalcopyrite concentrate was investigated using various combination of a desulfurizing agent, such as CaO, Na₂CO₃, BaO and MgO under Hz and CO atomsphere. The laboratory reduction experiments were carried using thermogravimetric analysis(TGA), and the degrees of metallization were determined by both weight loss and chemical analysis methods. The rate of reduction was increased by increasing the temperature and the amount of desulfurizing agents. The effect of desulfurizing agents was in the order of Na₂CO₃, CaO, BaO and MgO. Using these combinations, the sulfur was removed from the mineral as CaS or Na₂S etc.. The apparent activation energy(ΔEa) for the reduction roasting of chalcopyrite is about 4.28 ㎉/㏖. Based on this magnitude of the activation energy, it is suggested that a diffusion reaction is the rate limiting step for the temperature range(500-900℃) investigated. |
|
