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Synergistic extraction of rare earths by mixture of HDEHP and HEH/EHP in sulfuric acid medium HUANG Xiaowei1,ZHU Zhaowu1,ZHANG Yongqi1,WANG Chunmei1,ZHANG Guocheng1,LI Jianning1 (1.National..., Sm, Gd) in sulfuric acid medium using the mixture of HDEHP(H2B2) and HEH/EHP(H2L2) was investigated. The synergistic enhancement coefficient(R) was calculated for La (1.96), Nd(3.52), Sm(5.96......
HDEHP萃取稀土过程的溶剂效应 柴金岭1 (1.山东师范大学化学系,济南250014) 摘要:考察了在不同溶剂中HDEHP对镨,钕,钐,镝,钬,镱等的萃取,计算得到萃取表观平衡常数Kex,热力学平衡常数KΘex和萃合物的溶解度参数δc,建立了lgKex与溶剂极性参数ET (30),α间的经验方程.发现溶剂性质不会影响萃取机理,但使HDEHP二聚体间的作用程度不同,而且显著影响萃取平衡关系.稀土离子萃合物的溶解度参数δc基本相同,萃合物的空间构型相同. 关键词:稀土; 二(2-乙基己基); 磷酸; 萃取; 溶剂效应; [全文内容正在添加中] ......
HDEHP和HEH/EHP在硫酸介质中对Y3+的协同萃取及反萃行为研究 薛向欣1,李红卫2,龙志奇2,张永奇2,王春梅2,黄小卫1 (1.东北大学冶金资源与环境工程研究所,辽宁,沈阳,110004;2.北京有色金属研究总院稀土材料国家工程研究中心,北京,100088) 摘要:对HDEHP(二(2-乙基己基)磷酸或P204)和HEH/EHP(2-乙基己基膦酸单-2-乙基己基酯或P507)在硫酸介质中协同萃取Y3+的行为进行了研究.结果表明,HDEHP和HEH/EHP混合萃取剂萃取Y3+时具有明显的正协同效应,当水相平衡pH=1.2时,HDEHP和HEH/EHP混合萃取体系萃取Y3+的R(协萃系数,下同)为27.86,协萃系数随水相平衡pH的升高而增加,协萃反应式为:Y3++2H2A2(o)+H2B2(o) Y(HA2)2(HB2)(o)+3H+.另外,对负载Y3+的HDEHP和HEH......
HDEHP在硫酸溶液中萃取分离轻稀土性能研究 乔军1,柳召刚1,郝先库1 (1.包头稀土研究院,内蒙古,包头,014010) 摘要:研究了HDEHP在硫酸溶液中萃取分离轻稀土离子时有机相浓度,皂化剂类型,有机相皂化率,料液酸度对萃取饱和容量,分配比,分离系数的影响,确定了最佳萃取工艺参数,测定了轻稀土离子的分配比和分离系数. 关键词:稀土; 萃取; HDEHP; 硫酸溶液; [全文内容正在添加中] ......
HDEHP和HEH/EHP混合萃取剂在硫酸介质中协同萃取RE(Ⅲ)的机制研究 龙志奇1,张永奇1,朱兆武1,张国成1,李建宁1,王春梅1,黄小卫1 (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) 摘要:对HDEHP(H282)和HEH/EHP(H2L2)混合萃取剂在硫酸介质中萃取稀土元素(La,Nd,Sm,Gd)的机制进行了研究.研究表明,在水相平衡pH=2.0时,混合萃取剂萃取这几种元素的协萃系数分别为:1.96(La),3.52(Nd),5.96(Sm),5.71(Gd),并且协萃系数随水相平衡pH的升高而增加.利用斜率法分别确定了单一萃取剂HDEHP和HEH/EHP以及混合萃取剂HDEHP+HEH/EHP在硫酸体系中萃取稀土元素的配合物结构式分别为RE(SO4)xH2x(HB2)3,RE(SO4)xH2x(HL2)3以及......
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 龙志奇1,朱兆武1,罗兴华1,刘营1,黄小卫1 (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) 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的摩尔分散在0.6时,体系的协萃系数最大.Ce(Ⅳ)以Ce(SO4)0.5HL2A2的形式被萃人有机相,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△G,△H和△S等. 关键词:协同萃取; Ce(Ⅳ); HEH/EHP萃取剂; HDEHP萃取剂; 硫酸介质; 稀土; [全文......
Solvent Effects on Extraction of Rare Earth Metals with HDEHP柴金岭摘 要:SolventEfectsonExtractionofRareEarthMetalswithHDEHPChaiJinling(柴金岭)ShandongNormalUniversity,Jinan250014,ChinaReceived10July19...关键词:......
Synergistic extraction of rare earths by mixture of HDEHP and HEH/EHP in sulfuric acid medium张永奇,李建宁,黄小卫,王春梅,朱兆武,张国成摘 要:The extraction of RE(III) (RE=La, Nd, Sm, Gd) in sulfuric acid medium using the mixture of HDEHP(H2B2) and HEH/EHP(H2L2) was investigated. The synergistic enhancement coefficient(R) was calculated for La (1.96), Nd(3.52), Sm(5.96......
) 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... 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......
A novel Ce(Ⅳ) ion-selective polyvinyl chloride membrane electrode based on HDEHP and HEH/EHP何金桂1,2,3,李勇1,2,薛向欣1,2,茹红强3,黄小卫4,杨合1,21. Department of Resources and Environment School of Metallurgy... polyvinyl chloride(PVC) membrane electrode based on HDEHP and HEH/EHP as ionophore was successfully prepared. The factors affecting the response of Ce(Ⅳ) ion were investigated, such as membrane composition......