摘要
全钒氧化还原液流电池具有清洁、高效、安全、寿命长等优点,是一种新型的储能技术,成为目前研究的热点,其中高纯钒电解液的制备是研究的关键。以钒渣钠化焙烧后的含钒浸液为原料,通过"酸化-还原-萃取-反萃"一步纯化制备了高纯钒电解液。研究了V(IV)萃取及其与主要杂质元素硅和铝的分离效果,获得钒萃取纯化的优化条件为:P507浓度为30%, pH=1.8～2.0。温度对钒萃取影响较小;萃取过程中,钒与铝硅分离效果好;根据V(IV)的萃取和反萃分配曲线绘制了McCabe Thiele图,在pH=2.0、相比O/A为1∶1条件下,以30%(体积分数)的P507经两级(理论级)萃取,含钒20.9 g·L^(-1)的料液中的钒基本萃取完全,萃取率大于98%;硫酸溶液能够很好地反萃钒,通过控制H_2SO_4浓度和相比,经两级逆流反萃和去除夹带有机相后制得了高质量的硫酸氧钒电解液。
Vanadium redox battery was a new technology for energy storage with many advantages,such as environmental friendship,high efficiency,good safety,longer cycling life,and currently,it became a hot research topic.One of the key research areas was the preparation of highly pure vanadium electrolyte which was important for improving the battery performance.In this study,a highly pure VOSO 4 electrolyte was prepared through acidification,reduction,and solvent extraction with P507 as the extractant using a vanadium water leach solution obtained by sodium roasting and leaching processes of vanadium slag.The extraction of V(IV)and its separation from the main impurities of aluminum and silicon were studied.The results showed that the optimum conditions for V(IV)extraction and separation from the impurities were 30%(volume fraction)P507 at pH=1.8~2.0.Temperature had insignificant effect on V(IV)extraction.Based on the V(IV)extraction and stripping distribution isotherms,McCabe Thiele diagrams were constructed.It was demonstrated that two theoretical stages were required to completely extract vanadium from the leach solution containing 20.9 g·L^-1 V(IV)at an O/A ratio of 1∶1 and pH 2.0 using 30%P507.Sulfuric acid solution could be used for the vanadium stripping.A vanadium electrolyte with high quality was obtained via vanadium stripping in two counter-current stages after organic removal.
作者
张健
朱兆武
陈德胜
王丽娜
王伟菁
雷泽
Zhang Jian;Zhu Zhaowu;Chen Desheng;Wang Lina;Wang Wei jing;Lei Ze(National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100910,China;Key Laboratory of Green Process and Engineering,Chinese Academy of Science,Beijing 100910,China;School of Chemical & Environmental Engineering,China University of Mining & Technology-Beijing,Beijing 100083,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2019年第3期303-311,共9页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(21506233
21606241
51774260)
中国科学院前沿科学重点研究项目(QYZDJ-SSW-JSC021)
中国科学院科技服务网络计划(STS计划)(KFJ-SW-STS-148)资助
关键词
钒电解液
萃取
反萃
浸液
硫酸氧钒
vanadium electrolyte
solvent extraction
stripping
leach solution
VOSO4
