关键词: 电渗析, 电去离子, 离子交换法, 连续电提取浓缩

Abstract: Electrodeionization process combined electrodialysis with ion exchange provides a method to produce pure water and ultrapure water due to the ions accumulated in the resin instantaneously to reduce the system resistance. Meanwhile, large numbers of hydrogen ions and hydroxyl ions are dissociated by water hydrolysis, thus, the ion exchange resins are in-situ regenerated electrochemically. This technology has been utilized to retrieve useful ions which are enriched in the concentrated compartment from a dilute solution. This hybrid process is consequently developed as a new type of extraction and concentration technology and has been gradually employed in the recoveries of heavy metals, rare metals, nutritive salts, organic acids and alkalis, and even gases. This review describes the principle and future trend of this kind of continuous electroextraction and concentration technology, addressing the applications for attracting attention of scientists in the electrochemistry field.

Key words: electrodialysis, electrodeionization, ion exchange method, continuous electroextraction and concentration