2-乙基己基膦酸单2-乙基己基酯和二(2-乙基己基)磷酸从硫酸介质中协同萃取Ce(Ⅳ)的研究  

Synergistic Extraction of Cerium(Ⅳ) from Sulphuric Acid Medium Using Mixture of 2-Ethylhexyl Phosphonic Acid Mono 2-Ethylhexyl Ester and Di-(2-Ethyl Hexyl) Phosphoric Acid as Extractant

作　　者：罗兴华[1] 黄小卫[1] 朱兆武[1] 龙志奇[1] 刘营[1] 

机构地区：[1]北京有色金属研究总院稀土材料国家工程研究中心有研稀土新材料股份有限公司,北京100088

出　　处：《中国稀土学报》2008年第5期566-569,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家高技术研究发展计划(2006AA06Z123);国家科技支撑计划(2006BAC02A06)资助项目

摘　　要：研究了用2-乙基己基膦酸单-2-乙基己基酯(HEH/EHP,P507)和二(2-乙基己基)磷酸(HDEHP,P204)从硫酸介质中协同萃取Ce(Ⅳ)的机制。结果表明:在HEH/EHP的摩尔分数在0.6时,体系的协萃系数最大。Ce(Ⅳ)以Ce(SO4)0.5HL2A2的形式被萃入有机相,协萃反应为阳离子交换机制。同时还得到了HEH/EHP和HDEHP从硫酸介质中协同萃取Ce(Ⅳ)时,体系的平衡常数及热力学函数如ΔG,ΔH和ΔS等。Synergistic extraction of cerium （ Ⅳ ） from sulphuric acid medium using mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester （HEH/EHP, HL） and Di-（2-ethyl hexyl） phosphoric acid （HDE- HP, HA） 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）0.5 HL2A2. A cation exchange mechanism was proposed for the synergistic extraction of Ce（ Ⅳ ）. The equilibrium constants, and thermodynamic functions such as △G, AH and AS were determined in the extraction of Ce（Ⅳ ） from sulphuric medium using mixture of HEH/EHP and HDEHP.

关 键 词：协同萃取 CE(IV) HEH/EHP萃取剂 HDEHP萃取剂 硫酸介质 稀土 

分 类 号：O641.3[理学—物理化学]