摘要:
钒和铬化学性质相似且共生,而溶剂萃取法分离钒铬是目前研究最多的方法。评述了中性络合萃取体系、离子缔合萃取体系、酸性络合及螯合萃取体系和协同萃取体系这四种传统溶剂萃取体系分离钒铬的研究现状,并以三液相萃取体系为例,介绍了新颖的萃取体系。分析了各萃取体系的优缺点,基于环境保护和企业效益角度,指出三液相萃取体系由于分离系数高,物理现象良好,工艺流程短,操作简便,成本低且萃取剂配比灵活,具有更美好的前景。
Abstract:
Vanadium and chromium have the similar chemical properties and naturally coexist at most occasions,so the problem for separation of vanadium and chromium has not been properly solved for a long time.The solvent extraction is currently the most common method for the separation of vanadium and chromium. Traditional extraction systems for vanadium-chromium separation,including neutral complexation extraction system,ion association extraction system,acidic complexation and chelation extraction system,synergistic extraction system,were introduced.Three-liquid phase extraction system was used as an example for introducing a novel extraction system. Furthermore,the advantages and disadvantages of each extraction system were analyzed. Three-liquid phase extraction system is expected to have a broad prospect due to a high separation factor,well physical phenomena,short process flow,simple operation,low cost and flexible ratio of extractant,considering the environment protection and company benefits.
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