Extraction and separation of yttrium from other rare earths in chloride medium by phosphorylcarboxylic acids  

作　　者：Guolong Wu Zhifeng Zhang Yanling 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]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》2022年第6期958-964,I0004,共8页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Project of China(2019YFC0605003);the Strategic Priority Research Program of CAS(XDA02030100)。

摘　　要：Two phosphorylcarboxylic acids,3-((bis(2-ethylhexyloxy))phosphoryl)propanoic acid(PPA) and 3-((bis(2-ethylhexyloxy))phosphoryl)-3-phenylpropanoic acid(PPPA),were synthesized for separating yttrium from other rare earths in the chloride feed of ion-adsorption type rare earth concentrate.The effect of the factors such as pH_(1/2),temperature,saponification degree and phase modifiers was investigated.The separation efficiencies of PPA and PPPA are obviously better than the typical extractants such as sec-octylphenoxy acetic acid(CA-12) and naphthenic acid(NA).The extraction process of rare earths by PPA and PPPA is a cation exchanging reaction,which is similar to those of CA-12 and NA.The loaded rare earths in both PPA and PPPA systems can be effectively back-extracted by 0.5 mol/L HCl or higher concentration.A cascade extraction process for separating yttrium from other rare earths was developed using PPPA as the extractant.The yttrium product with the purity of 97.20 wt% was obtained by 35 stages of extraction and 12 stages of scrubbing.

关 键 词：Phosphorylcarboxylic acids Extraction Separation YTTRIUM CHLORIDE Ion-adsorption type rare earth concentrate 

分 类 号：TF845[冶金工程—有色金属冶金]