HDEHP和HEH／EHP在硫酸介质中对Y3＋的协同萃取及反萃行为研究  

Synergistic Extraction and Stripping of Y^(3+) by Mixtures of HDEHP and HEH/EHP

作　　者：黄小卫[1] 张永奇[2] 龙志奇[2] 王春梅[2] 李红卫[2] 薛向欣[1] 

机构地区：[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

出　　处：《稀土》2008年第3期5-9,共5页Chinese Rare Earths

基　　金：国家863项目(2006AA06Z123);国家自然科学基金项目(50674016)

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)K12Y(HA2)2(HB2)(o)+3H+。另外,对负载Y3+的HDEHP和HEH/EHP混合萃取体系进行了反萃性能研究,结果表明,Y的反萃率随混合体系中HEH/EHP摩尔比的增加而增大;同时比较了相同酸度的HCl,HNO3及H2SO4对同一负载有机相的反萃性能,反萃能力为HCl>HNO3>H2SO4。The extraction of Y3＋ in sulfuric acid medium by mixture of HDEHP（di（2 - ethylhexyl） phosphoric acid or P204）, HEH/EHP（2 - （ethylhexyl） phosphoric acid mono- 2- ethylhexyl ester or P507） has been investigated. Synergistic reaction was as follows： Y3＋＋2H2A2（o）＋H2B2（o）←→K12Y（HA2）2（HB2）（o）＋3H＋ Synergistic enhancement coefficients（R） of Y3＋ in the HDEHP/HEHEHP mixture system was 27.86 in the aqueous equilibrium pH of 1.2, and R increased with the increase of aqueous equilibrium pH. In addition, stripping of Y3＋ from mixture of HDEHP and HEH/EHP has been studied. Accumulated stripping ratio in different acidity was aLso determined. The stripping ratio increased with increase of mole ratio of HEH/EHP in fire mixture. Compared with same acidity of HCl, HNO3, H2SO4, the stripping order was HCl〉 HNO3 〉 H2SO4.

关 键 词：HDEHP HEH/EHP 硫酸介质 协同萃取 Y3+ 

分 类 号：O614.33[理学—无机化学] TF804.2[理学—化学]