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印度地区研究实验室M.L.P.Reddy等研究了用双(2,4,4-三甲基戊基)二硫代膦酸(Cyanex301=HX)与三烷基氧化膦(Cyanex923=TRPO)在二甲苯中的混合物从硝酸盐溶液中协同萃取三价的稀土。结果证明这类三价金属离子单独被Cyanex301以MX_3·3HX的形式萃入二甲苯。在Cyanex923存在下,发现La(Ⅲ)和Nd(Ⅲ)以MX_2·NO_3·TRPO形式被萃取。另一方面,Eu(Ⅲ)、Y(Ⅲ)和重稀土以MX_3·HX·2TRPO形式被萃取。向该萃取系统加入三烷
Indian Regional Research Laboratory MLPReddy et al. Studied the use of bis (2,4,4-trimethylpentyl) dithiophosphonic acid (Cyanex 301 = HX) with trialkylphosphine oxide (Cyanex 923 = TRPO) in xylene The synergistic extraction of trivalent rare earths from the nitrate solution. The results show that such trivalent metal ions are separately extracted into xylene by Cyanex 301 in the form of MX_3.3HX. In the presence of Cyanex923, La (Ⅲ) and Nd (Ⅲ) were found to be extracted as MX_2 · NO_3 · TRPO. On the other hand, Eu (III), Y (III) and heavy rare earths are extracted in the form of MX_3 · HX · 2TRPO. Trioxane was added to the extraction system