Efficient enrichment and selective recovery of rare earths from sulfate leachate of ion-adsorption type rare earth ore by extraction with HPOAc  

作　　者：Jinglu Han Yanling Li Songsong Li Wuping Liao 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei,230026,China [3]Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341000,China

出　　处：《Journal of Rare Earths》2024年第11期2156-2165,I0006,共11页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (92262301);the National Key Research and Development Project of China (2022YFC2905201);the Strategic Priority Research Program of CAS(XDA02030100);Jiangxi "Double Thousand Plan"(JXSQ2020101005)。

摘　　要：The efficient enrichment and separation of rare earth elements(REEs) from sulfate leachates of ionadsorption type rare earth ore(IATREO) is still a challenge.This work presents a novel extractant 2-(bis((2-ethylhexyl)oxy)phosphoryl)-2-hydroxyacetic acid(HPOAc) for the selective extraction and efficie nt enrichment of REEs from sulfate leachates of IATREO.HPOAc exhibits higher extraction ability for all fifteen REEs(Ⅲ) than naphthenic acid(NA) at pH_(ini)=1,56.Furthermore,it has no drawbacks of di-(2-ethylhexyl) phosphoric acid(P204) and 2-ethylhexyl phosphoric acid mono-2-ethylhexylester(P507)such as weak extraction ability towards light REEs(Ⅲ) and high stripping acidity for heavy REEs(Ⅲ).It has better separation performance for metal ion impurities than P204 and P507,especially for the typical impurity Al(Ⅲ).Furthermore,the HPOAc system has better phase separation behavior and extraction pheno mena.A simulated operation with two-stage counte r-current extraction and single-stage stripping of REEs was carried out using unsaponified HPOAc.The recovery of REEs reaches 98.7%.The concentration of REEs increases from 0.44 to 130.35 g/L,indicating a nearly 300-fold increase.Furthermore,the content of REEs increases from 77.8 wt% to 97.6 wt%.So HPOAc has the potential to selectively recover REEs from sulfate leachates of IATREO.

关 键 词：Rare earths Solvent extraction ENRICHMENT Separation EXTRACTANTS 

分 类 号：TF845[冶金工程—有色金属冶金]