化工进展2018，Vol.37Issue(7)：2846-2853,8.DOI:10.16085/j.issn.1000-6613.2017-1905
吸附法去除电解用氯化钠中微量碘离子
Adsorptive removal of trace iodide ion from NaCl used in electrolysis
摘要
Abstract
In the manufacturing process of ion-exchange membrane caustic soda, trace iodide ions in the brine are oxidized during the electrolysis process into iodate ions or periodate ions which react with sodium ions, barium ion, calcium ion and magnesium ion in the brine to form precipitates, causing the membrane congested, the service life of the membrane shortened, electrolytic current efficiency reduced, and the voltage raised. Therefore, organic amine adsorbent for iodide was prepared by sol-gel method to study the dynamic adsorption removal performance and adsorption column recycling performance of trace iodine ions in sodium chloride solution. The results showed that the content of iodine ion in salt water was dropped to below 0.2mg/L after the adsorption column treatment, and the performance of the for the brine was between 3.0L/g to 3.6L/g when the quantity ratio of iodide ion and hydrogen ion was 1:2, the material liquid velocity was 6.4mL/(g?min), iodine ion content was 10mg/L, Na2CO3 elution content was 0.01mol/L, and cycle index was five times. Furthermore, the influence of the coexisting ions in the salt water on the iodide removal performance was investigated. The results showed that coexisting Br–, SO42–, Mg2+, and Fe2+ caused handle brine volume of the adsorption column decreased. Therefore, the removal treatment of iodide from brine should be conducted after calcium, magnesium, and iron removal treatments to ensure the iodine adsorption column efficiency.关键词
动态吸附/碘离子/氯化钠/离子膜制碱Key words
dynamic adsorption/iodide ion/sodium chloride/ion-exchange membrane alkali manufacturing分类
化学化工引用本文复制引用
张慧芳,叶秀深,李权,刘海宁,郭敏,吴成友,胡耀强,吴志坚..吸附法去除电解用氯化钠中微量碘离子[J].化工进展,2018,37(7):2846-2853,8.基金项目
国家自然科学基金(21401209,51403229,51662035, U1507104)及青海省自然科学基金(2015-ZJ-947Q,2015-ZJ-933Q)项目. （21401209,51403229,51662035, U1507104）
