钒酸钾钙化沉钒法制备钒酸钙  

Preparation of Calcium Vanadate by Calcification of Potassium Orthovanadate

作　　者：赵楚[1,2] 郑诗礼[2] 王少娜[2] 杜浩[2] 杨娜[3] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室,北京100190 [3]北京神雾环境能源科技集团股份有限公司,北京102200

出　　处：《过程工程学报》2013年第3期442-446,共5页The Chinese Journal of Process Engineering

基　　金：中国科学院重点部署基金资助项目(编号:KGCX2-EW-215);国家自然科学基金面上基金资助项目(编号:51274179)

摘　　要：针对钾系亚熔盐法分解钒渣的中间产品钒酸钾,提出通过添加CaO实现钒酸钾中钾、钒分离,并同步实现钾再生循环的新方法,考察了各工艺参数对钙化沉钒的影响,得到钙化沉钒的最佳工艺条件.结果表明,在KOH浓度140g/L及CaO添加量为理论计算量的1.2倍、反应温度90℃、反应时间2h的最佳工艺条件下,钒酸钾中钒转化率达95.9%以上,生成的钙化产物为Ca10V6O25,可直接用于钒铁冶炼,钾生成KOH返回用于分解钒渣.A method to recycle the potassium in the potassium orthovanadate salt produced in sub-molten salt treatment of vanadium slag was proposed, and calcium oxide taken as an effective reagent to provide calcium ion, replacing the potassium in the salt. Potassium vanadate calcification conditions were systematically investigated, and the optimal operation parameters influencing the calcification efficiency obtained. By controlling the KOH concentration at 140 g/L, CaO excessive coefficient 1.2, and reaction temperature 90℃ , 95.9% of potassium vanadate was calcified in 2 h, leading to formation of Ca10V6025 precipitate, which could be used in production of steel alloying material ferrovanadium directly. And the potassium could be recycled in the form of potassium hydroxide, which was the major component for the vanadium slag decomposition using sub-molten salt media.

关 键 词：亚熔盐 钒渣 钒酸钾 钙化沉钒 清洁生产 

分 类 号：TQ135.1[化学工程—无机化工]