二(2,4,4-三甲基戊基)膦酸萃取稀土离子  

EXTRACTION OF RARE-EARTH IONS(Ⅲ) WITH BIS(2,4,4-TRIMETHYLPENTYL) PHOSPHINIC ACID

作　　者：张晓凤[1] 李德谦[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《应用化学》1993年第4期72-74,共3页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助课题

摘　　要：2-乙基己基膦酸单2-乙基己基酯(HEH/EHP)是目前稀土湿法冶金工业中应用最广泛的萃取剂。但存在重稀土离子反萃取酸度高,某些中、重稀土离子对的分离系数小、选择性不高等缺点。所以研究优于HEH/EHP的新萃取体系已引起人们极大的关注。近年来发现,二(2,4,4-三甲基戊基)膦酸(HBTMPP,HL)有可能是萃取稀土元素的有效萃取剂。由于其分子中不含酯氧原子,使得它的pK。值比HEH/EHP高。因此。The extraction behavior of trivalent rare-earth ions (except Sc, Pm) in hydrochloric acid solution using a n-octane solution containing his(2,4,4-trimethylpentyl) phosphinic acid(HBTMPP) was studied. The mean separation factor (β_z^(z+1)) for the system was found to be 3. 24. The system showed an advantage of higher selectivity and easier stripping ever that With HEH/EHP. The extraction mechanism for Er(Ⅲ) and Tm(Ⅲ) ions has been investigated by the method,of solpe analysis.The equilibrium constants of the extraction have been calculated and the IR and ~1H NMR spectra of the Er (Ⅲ) complex have been discussed.

关 键 词：膦酸 稀土离子 萃取平衡 

分 类 号：O614.33[理学—无机化学]