钒渣钙化焙烧试验研究

Research on Vanadium Slag Roasted with Calcium Salt

通过对焙烧温度、焙烧时间及钙钒比的正交试验和单因素试验,掌握了钒渣钙化焙烧最优参数组合。分析了钒渣钙化焙烧过程中钒、铁及碳酸钙的变化情况,同时针对冷却制度对钒渣焙烧效果的影响进行了讨论。试验表明,适合工业生产的控制方案为:焙烧温度890～920℃、焙烧时间1.5～2.5 h,内配钙钒比(CaO/V2O5)0.5～0.7,冷却时间40～60 min、冷却结束温度400～600℃,在此条件下进行焙烧,钒渣的转浸率为87.27%。

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.