基于实验室电渗析系统,研究了高盐浓度下不同初始离子质量比物料的迁移规律及其对一、二价离子选择性的影响。结果表明,当初始氯化钠(NaCl)与硫酸钠(Na₂SO₄)的质量比≥3∶1时,电渗析在浓缩过程中表现出明显的分盐效果,而当其质量比≤3∶5时,电渗析在浓缩过程中脱盐液侧可以实现Na₂SO₄的纯化;当初始NaCl与Na₂SO₄的质量比≥2∶5时,氯离子具有优先迁移性,而当初始NaCl与Na₂SO₄的质量比为1∶5时,硫酸根离子开始具有优先迁移性。

Based on a lab-scale electrodialysis system,the migration pattern of the materials with different initial ion ratios,and its impact on the selectivity of mono- and divalent ions are investigated in a high-salinity situation.The electrodialysis system shows an obvious salt separation effect in the concentration process when the mass concentration ratio of initial sodium chloride to sodium sulfate is not less than 3∶1.The electrodialysis system can purify sodium sulfate at the desalting solution side in the concentration process when the mass concentration ratio of initial sodium chloride to sodium sulfate is not larger than 3∶5.Chloride ions have preferential mobility when the mass concentration ratio of initial sodium chloride to sodium sulfate is not less than 2∶5∶1,while sulfate ions have preferential mobility when the mass concentration ratio of initial sodium chloride to sodium sulfate is 1∶5.