刘英辉
,
孙晓琦
,
罗芳
,
陈继
稀有金属
doi:10.3969/j.issn.0258-7076.2007.03.023
提供了一种固定Cyanex 923的新方法-溶胶-凝胶法.在溶胶-凝胶过程中离子液体的加入增加了复合材料的比表面积和孔容,并在硅胶网络中为Cyanex 923提供了一个可以扩散的介质.包埋离子液体和Cyanex 923的有机-无机复合材料的制备过程不需要其他有机溶剂,绿色、环保.结果表明,该复合材料对Y(Ⅲ)和重稀土元素有较好的分离效果.经过4次萃取/反萃过程,该复合材料对Y(Ⅲ)去除率仍高于78%.表明材料性能稳定,可多次重复使用.
关键词:
溶胶-凝胶
,
离子液体
,
Cyanex 923
,
稀土分离
W.P. Liao
,
G.H. Yu
,
D.Q. Li
金属学报(英文版)
The extraction equilibrium of cerium(IV) and fiuoriue(l) from II2SO4 solution tyCyanex 923 was studied. The extraction mechanism of Ce(IV) and F(I) by Cyanex923 was determined by the method of slope analysis. The results showed that Cyane923 can extract HF as HF.L and Ce4+ together with HF as Ce(HF)(HSO4)2(SO4).2Lby which HF comes into the organic phase mainly when there is Ce4+ in the solution,where L is the extractant. Temperature did not affect the extraction. The IR spectraof purified Cyanex 923 saturated with Ce(IV) and HF were discussed.``
关键词:
solvent extraction
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