Na₂WO₄溶液离子交换中WO₄^2-和 SO₄^2-分离系数的测定

来源期刊：中南大学学报(自然科学版)2002年第1期

论文作者：孙培梅 谢武明 李运姣 赵中伟 霍广生 孙召明

文章页码：25 - 27

关键词：Na₂WO₄溶液;离子交换;分离系数

Key words：Na₂WO₄ solution; ion-exchange; separation factor

摘    要：在钨冶炼的离子交换过程中, Na₂WO₄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SO₄^2-的Na₂WO₄溶液和201×7强碱性阴离子交换树脂进行离子交换时WO₄^2-和SO₄^2-的分离系数,绘制了该体系在25℃时的离子交换平衡等温线.研究结果表明:在WO₄^2-溶液中,当WO₃浓度为0.086 2 mol/L,SO₄^2-浓度为0.02~0.4 mol/L时,分离系数β(WO₄^2-/SO₄^2-)为2.473 1~3.780 4.并且当溶液中WO₄^2-浓度不变,而改变SO₄^2-浓度时,随着溶液总浓度的增大,分离系数β(WO₄^2-/SO₄^2-)逐步增大.表明在离子交换过程中,随着溶液中SO₄^2-摩尔分数的增大,树脂对SO₄^2-的吸附能力减小.

Abstract: In ion exchang process of tungsten, the anion impurities in Na2WO4solution have large influence on tungsten exchange capacity and quality of product APT. The separation factors β(WO₄^2-/ SO₄^2-) and the ion-exchange is other mat 25℃between resin and (Na₂WO₄+Na₂SO₄) solution have been determined in the ion-exchange process of 201×7 resin with Na₂WO₄ solution containing SO₄^2- by experiments. The results express that under the conditions of c(WO₃)=0.086 2 mol/L and c(SO₄^2-)=0.02~0.4 mol/L, the separation factor β(WO₄^2-/SO₄^2-)=2.473 1~3.780 4, and The β(WO₄^2-/SO₄^2-) increases with the increase of SO₄^2-concentration when WO₄^2- concentration in solution is fixed.This expresses that the adsorption ability of resin on SO₄^2-gradually be cames smaller and smaller with the increase of SO₄^2- mole fraction in solution.