The role ofβ,γ,δ-substituent of dialkylphosphinic acids in HREE extraction and separation behaviors  

作　　者：Junlian Wang Wen Xu Jianguo Cui Guodong Xu Yufu Chen Peilong Wang Ziyong Chang 

机构地区：[1]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing,100083,China [2]State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou,014030,China [3]Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,Beijing,100083,China

出　　处：《Journal of Rare Earths》2023年第11期1789-1795,I0005,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (51974026,21301104);the State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization。

摘　　要：Heavy rare earth element(HREE)separation has always been a great challenge.The kind of dialkylphosphinic acids is recognized as the third generation of organophosphorous acid extractants.However,detailed relationship betweenβ-substituent(especially when it changes from H to methyl,and further to ethyl)and their extraction behaviors and selectivity for HREEs have rarely been reported.Besides,there are also few reports on effect ofγ,δ-substituent on HREE extraction and separation.In this paper,we synthesized five and collected two dialkylphosphinic acids with differentβ,γ,δ-substituents(from H to ethyl).These extractants were divided into two groups to discuss their extraction behaviors and selectivity for HREEs:β-substituent group(P208,INET-1,P218,USTB-1 and P227)andγ,δ-substituent group(P218,P2132 and Cyanex 272).To evaluate and compare their extractabilities,P507 was used as a reference and Tm,Yb,Lu were extracted with 0.01 mol/L of these extractants from single Tm,Yb and Lu solutions(~4×10^(-4)mol/L)at different initial pH.Besides,pH_(0.5)(Tm),pH_(0.5)^(Yb)and pH_(0.5)^(Lu)values and their differences(ΔpH_(0.5)^(Tm-Yb),ΔpH_(0.5)^(Yb-Lu),ΔpH_(0.5)^(Tm-Lu))for each extractant were given to roughly evaluate their separation performance for Tm,Yb and Lu.To further investigate the selectivity of these extractants for HREEs,Tb,Dy,Ho,Er,Tm,Yb and Lu were extracted from their mixed solution with initial pH of 4.00 at phase ratio A/O of 2:1,1:1 or 1:2.Their HREE separation performance is mainly discussed based on the adjacent HREE separation factors(β_(N+1/N))and their average value(β_(Tb-Lu)).

关 键 词：Heavy rare earth element EXTRACTION SEPARATION Dialkylphosphinic acid Substituent effect 

分 类 号：O62[理学—有机化学]