Synergistic extraction of cerium from sulfuric acid medium using mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester and Di-(2-ethyl hexyl)phosphoric acid as extractant
来源期刊：JOURNAL OF RARE EARTHS2009年第1期
论文作者：LIU Ying HUANG Xiaowei ZHU Zhaowu LONG Zhiqi LUO Xinghua
Key words：synergistic extraction; cerium; HEH/EHP; HDEHP; sulfuric acid medium; rare earths;
Abstract: Synergistic extraction of cerium(IV) from sulfuric acid medium using mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester(HEH/EHP, HL) and Di-(2-ethyl hexyl) phosphoric acid (HDEHP, HA) as extractant was investigated. The results indicated that the maximum synergistic enhancement coefficients were obtained at the mole fraction of HEH/EHP=0.6, and cerium(IV) was extracted into organic phase in the form of Ce(SO4)0.5HL2A2. A cation exchange mechanism was proposed for the synergistic extraction of Ce(IV). The equilibrium constants and thermodynamic functions such as △G, △H, and △S were determined in the extraction of Ce(IV) from sulfuric medium using mixture of HEH/EHP and HDEHP.
LIU Ying1，HUANG Xiaowei1，ZHU Zhaowu1，LONG Zhiqi1，LUO Xinghua1
(1.National Eenineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous;
2.Grirem Advanced Materials Co., Ltd., Beijing 100088, China)
Abstract:Synergistic extraction of cerium(IV) from sulfuric acid medium using mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester(HEH/EHP, HL) and Di-(2-ethyl hexyl) phosphoric acid (HDEHP, HA) as extractant was investigated. The results indicated that the maximum synergistic enhancement coefficients were obtained at the mole fraction of HEH/EHP=0.6, and cerium(IV) was extracted into organic phase in the form of Ce(SO4)0.5HL2A2. A cation exchange mechanism was proposed for the synergistic extraction of Ce(IV). The equilibrium constants and thermodynamic functions such as △G, △H, and △S were determined in the extraction of Ce(IV) from sulfuric medium using mixture of HEH/EHP and HDEHP.
Key words:synergistic extraction; cerium; HEH/EHP; HDEHP; sulfuric acid medium; rare earths;
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