离子膜法制碱用盐水除碘技术研究进展与展望

Progress and Prospect on the Iodine Removal Techniques in the Production of Caustic Soda by Ion-exchange Membrane Method 

中文关键词:  烧碱  离子膜法  盐水精制  除碘  吸附法

英文关键词:Caustic soda  Ion exchange membrane method  Brine purification  Iodine removal  Adsorption

中文摘要:

      在离子膜法制碱过程中,电解盐水中的碘会以碘酸盐和高碘酸盐的形式在离子膜内聚积,造成膜堵塞、膜寿命缩短、电流效率降低、电压升高等问题。现有的盐水除碘技术有氧化吸附法、氧化吹除法和还原吹除法,这些方法均需将溶液中的离子碘转化为单质碘。碘离子吸附剂可直接吸附去除溶液中的碘离子,有望用于盐水除碘,既可避免投入氧化剂,又缩短了除碘工艺流程,其盐水除碘性能有待进一步研究。

英文摘要:

      :Iodine in brines used for the production of caustic soda by ion-exchange membrane method, will gather into the ion-exchange membranes during the electrolytic processes in the form of iodate and/or periodate, which can cause membrane blocking, membrane life shortening, current efficiency decrease, electrolytic voltage increase, and so on. Now available technologies for removing iodine from brines, including oxidation adsorption, oxidation blowing and reduction blowing methods, require the conversion processes of iodide/iodate into iodine molecules. Iodide adsorbents are expected to adsorb iodide ions from the electrolytic brines directly, avoiding the oxidation or reduction processes. Therefore, the whole iodine removal processes could be shortened. The studies on the preparation of iodide adsorbents and the adsorption behaviors of the iodide ions should be enhanced.