三氟乙酸锂-15-冠醚-5体系电迁移法分离锂同位素

Separation of Lithium Isotopes by Electromigration with Lithium Trifluoroacetate-15-crown-5 System

中文关键词:  锂同位素分离  15-冠醚-5  电迁移  水合作用

英文关键词:Lithium isotope separation  15-crown-5  Electromigration  Hydration

中文摘要:

      锂同位素(⁶Li和⁷Li)在核工业中有着重要作用。锂汞齐法是目前唯一实现锂同位素工业化生产的方法,然而由于汞的使用,该方法具有较大的环境风险。开发绿色高效的锂同位素分离方法对国家能源安全具有重要意义。在本论文中,制备了溶解锂盐的冠醚溶液,并以其作为阳极液,施加电场驱动锂离子向阴极液迁移；与溶有15-冠醚-5的锂盐水溶液作为阳极液相比,研究发现在阳极液体系中引入水分子可以促进锂同位素的分离。同时还考察了不同隔膜对锂同位素分离的影响,发现使用强疏水性隔膜时,短时间内有较好的分离效应。

英文摘要:

      Lithium isotopes(⁶Li and ⁷Li)play an important role in the nuclear industry.At present,COLEX process is the only method to achieve large-scale industrial application of lithium isotope separation,but it is harmful to the environment because of the mercury involved.The development of a green and efficient lithium isotope separation method is of great significance to national energy security.In this work,a crown ether solution dissolved in lithium salt was prepared and used as anode solution to drive the migration of lithium ions to cathode solution by applying an electric field.Compared with lithium salt solution dissolved with 15-crown-5,it was found that introducing water molecules into the anode solution system could promote the separation of lithium isotopes.The effect of different membrane on the separation of lithium isotopes was also investigated,and it was found that the separation effect was better in a short time when strong hydrophobic membrane was used.