中空纤维分散液膜富集稀土元素

发布时间：2018-02-28 08:07

本文关键词： 中空纤维分散液膜稀土富集乙基己基膦酸单-乙基己基酯　出处：《应用化学》2017年08期 　论文类型：期刊论文

【摘要】：采用2-乙基己基膦酸单-2-乙基己基酯(HEHEHP)-正庚烷为萃取剂,盐酸为反萃取剂,中空纤维膜作支撑膜,研究中空纤维分散液膜技术富集稀土镱(Yb~(3+))离子。考察了体系物性:反萃分散相中反萃剂浓度、萃取剂浓度、萃取剂与反萃剂体积比、料液相p H值、稀土离子浓度;流体流动状态:反萃分散相与料液相流速变化等因素对富集稀土离子的影响。中空纤维分散液膜富集Yb~(3+)的最佳条件为:萃取剂浓度为0.25 mol/L,反萃取剂HCl浓度为4.00 mol/L,萃取剂与反萃剂体积比为10∶40,料液相p H=2.80,稀土离子浓度为0.025 mol/L。反萃分散相体积流量和料液相体积流量较小时,萃取率随流量的增加呈现逐渐增大的趋势。若两相体积流量过大,反萃过程进行不完全,萃取率反而下降。研究结果表明,中空纤维分散液膜技术可实现稀土离子的有效富集。
[Abstract]:Using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester HEHEHPH-n-heptane as extractant, hydrochloric acid as backextractant, hollow fiber membrane as supporting membrane. The enrichment of ytterbium ytterbium (Yb) ~ (3 +) ion by hollow fiber dispersion membrane was studied. The physical properties of the system were investigated, such as the concentration of stripping agent in the stripping phase, the concentration of extractant, the volume ratio of extractant to stripping agent, the pH value of liquid phase and the concentration of rare earth ions. Fluid flow state: the influence of factors such as stripping dispersion phase and liquid flow rate on the enrichment of rare earth ions. The optimum conditions for enrichment of Yb~(3 by hollow fiber dispersion membrane are as follows: the concentration of extractant is 0.25 mol / L, and the concentration of HCl is 4.00. The optimum conditions are as follows: the concentration of extractant is 0.25 mol / L and the concentration of HCl is 4.00. Mol / L, the volume ratio of extractant to stripping agent is 10: 40, the volume ratio of extraction agent to stripping agent is 10: 40, the liquid phase pH is 2.80, the concentration of rare earth ion is 0.025 mol / L. the volume flow rate of dispersed phase and liquid phase is small. The extraction rate increases gradually with the increase of flow rate. If the volume flow of two phases is too large, the extraction process is incomplete and the extraction rate decreases. The results show that the hollow fiber dispersion membrane technology can effectively enrich rare earth ions.
【作者单位】：武汉生物工程学院化学与环境工程系;
【基金】：国家自然科学基金资助项目(21401146)~~
【分类号】：TQ028.8

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