HEH/EHP萃取剂中钍的反萃性能研究  

Stripping Behaviour of Thorium from HEH/EHP

作　　者：张永奇[1] 胡丰[1] 黄小卫[1] 龙志奇[1] 崔大立[1] 徐旸[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》2010年第6期660-664,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(5093674004);国家科技支撑计划项目(2006BAC02A06,2009BAB45B02);国家重大产业技术开发专项项目([2009]606)资助

摘　　要：研究了含钍HEH/EHP(2-乙基己基膦酸单-2-乙基己基脂)萃取剂中钍的反萃性能。采用HCl,HNO3和H2SO4三种矿物酸分别对钍进行了反萃试验研究,结果表明,当反萃酸浓度为[H+]=6 mol.L-1时,HCl和HNO3反钍率小于1%,而硫酸的反钍率接近69%,表明H2SO4是钍的有效反萃剂。以H2SO4作为反萃剂,研究了相比、反萃酸浓度、酸用量、萃取剂浓度及钍负载量对钍的反萃性能的影响。在此基础上,对钍的逆流反萃过程进行了研究,当起始酸浓度为7 mol.L-1时,分别采用1∶1和4∶1的相比进行3级逆流反萃,反萃率分别为92.10%和53.29%。The stripping behaviour of thorium（Th） from HEH/EHP（2-（ethylhexyl） phosphonic acid mono-2-ethylhexyl ester） were investigated in this paper.The stripping ability of hydrochloric acid,nitric acid and sulfuric acid were compared at 6 mol·L-1.The results indicated that the stripping rates of HCl and HNO3 was less than 1%,while that of H2SO4 was closed to 69%,therefore,the sulfuric acid was an effective stripping reagent.The main factors for Th stripping including H＋ concentration,H2SO4 amount,phase ratio,HEH/EHP concentration and Th concentration in HEH/EHP were studied.Based on the results above,a small-scale 3 stages counter-current stripping process was carried out at fixed H＋ concentration of 7 mol·L-1.The results indicated that the stripping rates were 92.10% and 53.29% respectively when the phase ratios were 1∶1 and 4∶1.

关 键 词：钍 反萃 HEH/EHP 稀土 

分 类 号：TF845.6[冶金工程—有色金属冶金]