Separation of Rare-Earth Elements by Synergistic Mixtures of Methyl(tri-n-Octyl)ammonium Nitrate and an Ammonium Di(2-Ethylhexyl)phosphoric Acid Salt

IF 1.8 3区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
E. O. Koroleva, E. V. Boyarintseva, S. I. Stepanov
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引用次数: 0

Abstract

The separation of medium-heavy group of rare-earth elements along the Gd/Tb line by liquid–liquid extraction from low-acid nitrate solutions was studied. A synergistic mixture of methyl(tri-n-octyl)ammonium nitrate (TOMAN) and an ammonium di(2-ethylhexyl)phosphoric acid salt (Amm-HD2EHP) was used as an extractant. The synergistic extraction area was determined using the isomolar series method. Gel formation was observed in extraction with the mixed extractants and with an individual ammonium salt of di(2-ethylhexyl)phosphoric acid (Amm-HD2EHP) at salt concentrations higher than 0.25 mol/L. In the area of system’s stability, the highest separation factor along the Gd/Tb line was higher than 3.8. n-Octanol (OC) and tri-n-butyl phosphate (TBP) were used as modifiers to prevent gel formation.

Abstract Image

硝酸铵与二(2-乙基己基)磷酸铵协同分离稀土元素的研究
研究了液液萃取法从低酸硝酸溶液中沿Gd/Tb谱线分离中重族稀土元素的方法。以三辛甲基硝酸铵(TOMAN)和二(2-乙基己基)磷酸铵盐(amm2ehp)为萃取剂。采用等摩尔级数法确定协同萃取面积。在盐浓度大于0.25 mol/L时,混合萃取剂和二(2-乙基己基)磷酸单铵盐(amm2ehp)均可形成凝胶。在体系稳定性区域,沿Gd/Tb线的分离系数最高,大于3.8。正辛醇(OC)和磷酸三正丁酯(TBP)是防止凝胶形成的改性剂。
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来源期刊
Russian Journal of Inorganic Chemistry
Russian Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
3.10
自引率
38.10%
发文量
237
审稿时长
3 months
期刊介绍: Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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