Extraction and separation of heavy rare earths from chloride medium by α-aminophosphonic acid HEHAPP
来源期刊：Journal of Rare Earths2018年第3期
论文作者：Shengting Kuang Zhifeng Zhang Yanling Li Haiqin Wei Wuping Liao
文章页码：304 - 310
摘 要：The extraction and separation of heavy rare earths（REs） using newly synthesized a-aminophosphonic acid extractant 2-ethylhexyl-3-（2-ethylhexylamino）pentan-3-yl phosphonic acid（HEHAPP, HA） in nheptane were investigated from chloride medium. The extraction stoichiometries of lanthanum, gadolinium, yttrium and lutetium are determined to be REA3 by the slope analysis method. The favorable separation factors of adjacent heavy REs（Ⅲ）,i.e. βY/Ho, βEr/Y,βTm/Er,βYb/Tm and βLu/Yb, are determined to be1.87,1.36, 3.21,3.22 and 1.93, respectively, when extracted from a binary system at proper condition. The loading capacities of HA for Ho, Er, Yb and Lu increase in the order Ho < Er < Yb < Lu with the values being 0.201, 0.205, 0.216 and 0.229 mol/L, respectively. So HA would be a potential extractant for the separation of heavy REs（Ⅲ）. Among inorganic acids such as H2 SO4, HNO3 and HCl, HCl is tested to be the most effective stripping agent.
Shengting Kuang1,2，Zhifeng Zhang1，Yanling Li1，Haiqin Wei1，Wuping Liao1
1. State Key Laboratory of Rare Earth Resource Utilization,ERC for the Separation and Purification of REs and Thorium,Changchun Institute of Applied hemistry,Chinese Academy of Sciences2. University of Science and Technology of China
摘 要：The extraction and separation of heavy rare earths（REs） using newly synthesized a-aminophosphonic acid extractant 2-ethylhexyl-3-（2-ethylhexylamino）pentan-3-yl phosphonic acid（HEHAPP, HA） in nheptane were investigated from chloride medium. The extraction stoichiometries of lanthanum, gadolinium, yttrium and lutetium are determined to be REA3 by the slope analysis method. The favorable separation factors of adjacent heavy REs（Ⅲ）,i.e. βY/Ho, βEr/Y,βTm/Er,βYb/Tm and βLu/Yb, are determined to be1.87,1.36, 3.21,3.22 and 1.93, respectively, when extracted from a binary system at proper condition. The loading capacities of HA for Ho, Er, Yb and Lu increase in the order Ho < Er < Yb < Lu with the values being 0.201, 0.205, 0.216 and 0.229 mol/L, respectively. So HA would be a potential extractant for the separation of heavy REs（Ⅲ）. Among inorganic acids such as H2 SO4, HNO3 and HCl, HCl is tested to be the most effective stripping agent.
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