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在钨冶炼的离子交换过程中 ,Na2 WO4溶液中杂质阴离子的存在对钨的交换容量和产品APT的质量都有较大的影响 .作者通过试验 ,测定了含有SO2 -4的Na2 WO4溶液和 2 0 1× 7强碱性阴离子交换树脂进行离子交换时WO2 -4和SO2 -4的分离系数 ,绘制了该体系在 2 5℃时的离子交换平衡等温线 .研究结果表明 :在WO2 -4溶液中 ,当WO3浓度为 0 .0 862mol/L ,SO2 -4浓度为 0 .0 2～ 0 .4mol/L时 ,分离系数 β(WO2 -4/SO2 -4)为 2 .4 73 1～ 3 .780 4 .并且当溶液中WO2 -4浓度不变 ,而改变SO2 -4浓度时 ,随着溶液总浓度的增大 ,分离系数 β(WO2 -4/SO2 -4)逐步增大 .表明在离子交换过程中 ,随着溶液中SO2 -4摩尔分数的增大 ,树脂对SO2 -4的吸附能力减小
During the ion exchange process of tungsten smelting, the existence of impurity anions in Na2 WO4 solution has a great influence on the exchange capacity of tungsten and the quality of the product APT. The authors determined that Na2 WO4 solution containing SO2 -4 and 2 0 1 × 7 strongly basic anion exchange resin ion exchange WO2 -4 and SO2 -4 separation factor, draw the system at 25 ℃ ion exchange equilibrium isotherm.The results show that: WO2 -4 solution , The separation coefficient β (WO2-4 / SO2-4) was 2.473-1-3 when the concentration of WO3 was 0.086 2 mol / L and the concentration of SO2-4 was 0.2-2.4 mol / L .780 4. And when the concentration of WO2-4 in the solution is constant and the concentration of SO2-4 is changed, the separation coefficient β (WO2-4 / SO2-4) gradually increases with the increase of the total concentration of the solution Ion exchange process, with the solution SO2 -4 mole fraction increases, the resin adsorption capacity of SO2 -4 is reduced