(中国科学院过程工程研究所 绿色过程与工程重点实验室，
湿法冶金清洁生产技术国家工程实验室，北京100190)
摘 要: 以钒渣亚熔盐法钒铬共提工艺所得到的中间产品钒酸钙为研究对象，针对钒酸钙后续产品转化问题，提出钒酸钙碳化铵化生产钒氧化物的工艺路线；研究NH4HCO3转化溶出钒的工艺条件，考察是否通入CO2、NH4HCO3的添加量、反应温度、不同液固比以及反应时间等对钒酸钙转化溶出效果的影响。结果表明：钒酸钙碳化铵化反应的最佳条件为反应温度75 ℃，液固比20:1，通入CO2，且流速1.5 L/min，铵钒摩尔比1.0，反应时间1 h，此条件下钒酸钙中钒转化率为97.35%。
关键字: 钒渣；亚熔盐；钒酸钙；碳化铵化；碳酸氢铵
（National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory for Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China）
Abstract:A new process which transforms calcium vanadate, the intermediate product during the previous vanadium-chromium co-extraction by vanadium slag sub-molten salt roasting process, to vanadium oxide using carbonization-ammonium method was proposed. The subsequent transformation of calcium vanadate and the vanadium extraction using NH4HCO3 as reactant was studied. The effects of CO2, NH4+-V mole ratio, liquid-solid ratio and reaction time were investigated. By controlling the reaction temperature at 75 ℃, liquid-solid ratio of 20, CO2 flow rate of 1.5 L/min, NH4+-V mole ratio of 1 and reaction time of 1 h, the optimal process conditions are obtained, which make the vanadium conversion from calcium vanadate reach 97.35%.
Key words: vanadium slug; sub-molten salt; calcium vanadate; carbonization-ammonium process; ammonium bicarbonate
