首页|Efficient enrichment and selective recovery of rare earths from sulfate leachate of ion-adsorption type rare earth ore by extraction with HPOAc
Efficient enrichment and selective recovery of rare earths from sulfate leachate of ion-adsorption type rare earth ore by extraction with HPOAc
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The efficient enrichment and separation of rare earth elements(REEs)from sulfate leachates of ion-adsorption 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 effi-cient enrichment of REEs from sulfate leachates of IATREO.HPOAc exhibits higher extraction ability for all fifteen REEs(Ⅲ)than naphthenic acid(NA)at pHini=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 phenomena.A simulated operation with two-stage counter-current extraction and single-stage stripping of REEs was carried out using unsaponified HPOAc.The recovery of REEs reaches 98.7％.The concen-tration 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.
State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China
School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei,230026,China
Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341000,China
National Natural Science Foundation of ChinaNational Key Research and Development Project of ChinaStrategic Priority Research Program of CASJiangxi"Double Thousand Plan"
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