钒和铬以V(Ⅴ)与Cr(Ⅵ)的形式存在沉钒废水中,降低该废液环境污染性的同时能有效回收其有价金属元素,显得尤为重要.通过某种阴离子交换树脂选择性吸附废液中V(Ⅴ)的方法从而实现钒与铬的分离及提取的目的.树脂吸附钒之前,废液中的V(Ⅴ)及Cr(Ⅵ)先被还原至V(Ⅳ)与Cr(Ⅲ),V(Ⅳ)进而被氧化至V(Ⅴ),然而Cr(Ⅲ)不被氧化,仍以三价阳离子态存在于废液.研究了吸附的温度、时间、废液pH值、杂质离子浓度及V(Ⅴ)浓度对该树脂吸附V(Ⅴ)的影响,优化了吸附的条件参数.试验结果表明钒及铬的总回收率分别为72％、95％,其终产品纯度分别为96％、93％.
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