Separation of aluminum from rare earth by solvent extraction with 4-octyloxybenzoic acid  

作　　者：Gaoshan Yu Zhiyuan Zeng Yun Gao Shuainan Ni Hepeng Zhang Xiaoqi Sun 

机构地区：[1]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]Fujian Research Center for Rare Earth Engineering Technology,Xiamen Institute of Rare Earth Materials,Haixi Institute,Chinese Academy of Sciences,Xiamen 361021,China [3]University of Chinese Academy of Sciences,Beijing 100039,China [4]Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China

出　　处：《Journal of Rare Earths》2023年第2期290-299,共10页稀土学报（英文版）

基　　金：Project supported by the National Key R&D Program of China(2017YFE0106900);Fujian Program for High-Level Entrepreneurial and Innovative Talents Introduction;Key R&D Program of Jiangxi Province(S2020ZPYFG0029);Key Program of the Chinese Academy of Sciences(ZDRW-CN-2021-3-1)。

摘　　要：Leaching method is usually used to extract rare earth(RE)elements from ion adsorbed RE ores.In the leaching process,some impurities such as aluminum(Al)enter the leaching solution.The separation of Al from RE by carboxylic acid extractant 4-octyloxybenzoic acid(POOA)was studied in this article.By changing the pH value,temperature,solvent,saponification degree and other parameters,the extraction and separation performance of POOA in chloride system was systematically studied.Through specific extraction experiments and slope analysis,it can be seen that the stoichiometric ratio of POOA to Al is 3:1during the extraction process.The separation factor of Al^(3+)and Pr^(3+)can reach about 160.00.Compared with easily emulsified naphthenic acid,POOA achieves better phase separation.The above results show that saponified POOA(S-POOA)has a good separation effect on Al and RE.Under the condition of low concentration stripping acid of 0.60 mol/L HCl,the developed extraction system can be almost completely stripped,and the stripping rate reaches 97.52%.The regenerated POOA can be directly used for the recycling extraction.

关 键 词：Rare earths Aluminium 4-octyoxybenzoic acid Solvent extraction SEPARATION 

分 类 号：TF845[冶金工程—有色金属冶金]