钼酸盐溶液离子交换钼钒分离机理
来源期刊：中国有色金属学报2008年增刊第1期
论文作者：胡健 王学文 肖连生 宋松如
文章页码：112 - 116
关键词：钼；钒；离子交换；分离机理
Key words：molybdenum; vanadium; ion-exchange; separation mechanism
摘 要：对钼酸盐溶液离子交换钼钒分离机理进行研究。研究结果表明，在钼酸盐溶液中V2O5含量约为0.5 g/L，钒与钼在pH值为6.5~8.5的范围内分别以 和 的形态存在。由于强碱性阴离子交换树脂对 的亲和力大于对 的亲和力，在交换过程中 优先被吸附，从而实现钼酸盐溶液中钼与钒的分离。在钼酸铵溶液中强碱性阴离子交换树脂的钒、钼分离系数为295.62，取工作穿透点为0.02 g/L V2O5，可确保流出液用硝酸酸沉得到的钼酸铵产品中钒的含量小于0.001 5%。
Abstract: The mechanism of vanadium removal from ammonium molybdate solution by ion-exchange was studied. It is found that V(Ⅴ) and Mo existing in ammonium molybdate solution are in the forms of and MOO42-, respectively, when V2O5 concentration is about 0.5 g/L and the pH value is in the range of 6.5-8.5. The adsorption of is prior to that of by a strong base resin because the charges contained in are higher than those in , which made vanadium removed from the solution by ion-exchange. Experimental results show that the coefficient of vanadium separation from molybdenum is 295.62 for the resin in the ammonium molybdate solution, and the content of vanadium is less than 0.001 5% in the ammonium molybdate crystal that was obtained by adding nitric acid to the effluent collected till the breakthrough point up to 0.02 g/L V2O5.
