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2-乙基己基膦酸单(2-乙基己基)酯[HEH(EHP),HL]是萃取分离稀土元素的有效萃取剂.作者及马恩新等研究了HEH(EHP)萃取低浓度稀土元素的平衡反应.Lenz等认为二(2-乙基己基)磷酸(HDEHP)萃取高浓度Nd(Ⅲ)和Sm(Ⅲ)时,ClO_4~-及NO_3~-参与萃取反应.定量研究HEH(EHP)从矿物酸溶液中萃取高浓度稀土元素(Ⅲ)的平衡规律及萃取反应具有实际意义,有关这方面的研究尚未见报道. 本文结合分离工艺,系统地研究了高浓度稀土元素在H~+(HNO_3,HCl)-H_2O-1.50FHEH(EHP)-煤油体系中的分配平衡,通过IR、NMR及平衡有机相中NO_3~-和Cl~-浓度的定量测定,提出了低酸度下不同稀土浓度的萃取反应.
(2-ethylhexyl) 2-ethylhexylphosphonate (HEH (EHP), HL] is an effective extraction solvent for extraction of rare earth elements. Elemental equilibrium reaction.Lenz et al. (2005) reported that ClO_4 ~ - and NO_3 ~ - participate in the extraction reaction when HDEHP is used to extract Nd (Ⅲ) and Sm (Ⅲ) ) The extraction of high concentrations of rare earth elements (Ⅲ) from mineral acid solution has the practical significance of the equilibrium law and the extraction reaction, and the research in this aspect has not been reported yet.In this paper, the separation process was used to systematically study the effects of high concentrations of rare earth elements on H ~ + (HNO_3, HCl) -H_2O-1.50FHEH (EHP) - kerosene system. The quantitative determination of NO_3 ~ - and Cl ~ - in the organic phase by IR, The extraction reaction.