采用混合离子交换树脂提取钨酸根

Utilization of Mixed Ion Exchange Resins for Extraction of Tungstate

本项目利用分光光度计和电感耦合等离子体-质谱联用仪(ICP-MS)测定钨酸根浓度,采用201x7、201x W和201x4阴离子交换树脂吸附钨矿提取液中的钨酸根离子,探究阴离子树脂混合比例对钨酸根离子的离子交换量,以及提取液中共存的杂质离子锡酸根、钼酸根对钨酸根吸附量和选择性的影响。结果表明:201x4树脂对钨酸根离子的吸附量最大,但选择性差;杂质离子对树脂吸附量和选择性影响较大。动态实验表明杂质离子可使钨酸根解吸附曲线后移,钨酸根吸附量减少。

In the project, spectrophotometry and inductively coupled plasma-mass spectrometry（ICP-MS） were utilized to measure the concentrations of tungstate ions, and three anionic exchange resins 201x7, 201 x W and 201x4 were adopted to adsorb the tungstate ions in the extracts of tungsten ores. The amounts of anionic exchange of tungstate by the mixtures of these three resins in various proportions, as well as the effects of common coexistent interfered impurity ions molybdenate and stannate on the ion exchanges and selectivity of tungstate by these resins were investigated. The results indicated that resin 201x4 provided the largest capacity for tungstate but suffered poorer selectivity. Impurity ions had great impacts on the resin exchange capacity and selectivity for tungstate ions. Column flow（dynamic） experiments showed that the presence of impurity ions resulted in delayed desorption of the tungstate ions from the mixed resins and a reduction in total adsorbed tungstate ions.