离子交换树脂脱除高浓磷酸钠溶液中的钒(V)和铬(VI)

Removal of Vanadium(V) and Chromium(VI) from High Concentration Sodium Phosphate Solution with Ion-exchange Resins

采用静态吸附实验研究了离子交换法深度脱除高浓度Na3PO4水溶液中微量钒(V)和铬(VI),考察了树脂性质、吸附温度、吸附pH值和固液比对钒(V)、铬(VI)吸附的影响.结果表明,在5种大孔苯乙烯系树脂中,D301R最适合脱除高浓磷酸钠溶液中的钒(V)和铬(VI),料液pH6.5、室温、树脂/料液比1g/10mL时,钒(V)、铬(VI)的去除率较好.10次动态循环实验结果表明,钒、铬脱除效率均在90%和80%以上,树脂重复使用性能稳定.钒在D301R树脂上的吸附主要受其与磷的置换过程控制,且其在树脂中的传质速率低于铬.

Removal of vanadium（Ⅴ） and chromium（Ⅵ） from high concentration sodium phosphate solution was studied by ion-exchange technology, focusing on the influential factors of resin characters, adsorption temperature, pH value and ratio of solid to liquid. The results showed that D301R was selected as the optimal resin from five macroporous styrene resins. With D301R resin at the pH of 6.5, room temperature, and ratio of resin to solution of 1：10, the removing effects were favorable. Ten cycles of dynamic experiments showed that removal rates of vanadium（Ⅴ） and chromium（Ⅵ） were 90% and 80% respectively, and the repeatability of resin was stable. The adsorption of vanadium（Ⅴ） on D301R resin was controlled by replacing process of phosphorus, and the mass transfer rate of vanadium（Ⅴ） was much lower than that of chromium（Ⅵ）.