Research on Vanadium Slag Roasted with Calcium Salt

Optimal parameters of vanadium slag roasted with calcium salt were obtained through orthogonal tests and single factor tests on roasting temperature,roasting time and calcium/vanadium ratio.Variation of vanadium,iron and calcium carbonate during roasting was analyzed and the effect of cooling conditions on the roasting results of vanadium slag was also discussed.The results showed that the vanadium leahcing rate could reach 87.27% with roasting temperature of 890~920 ℃,roasting time of 1.5～2.5 h,CaO/V₂O₅ ratio of 0.5～0.7 and cooling time of 40～60 min,which would be appropriate for industrial production.