Separation of La(Ⅲ),Ce(Ⅳ)and Ca(Ⅱ)from bastnaesite using acidic phosphonic chitosan and rotating disk membrane  

作　　者：Dandan Lu Wenhui Li Linlin Fan Yunren Qiu 

机构地区：[1]School of Chemistry and Chemical Engineering,Central South University,Changsha,410083,China

出　　处：《Journal of Rare Earths》2024年第5期995-1000,I0007,共7页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(22178392);the Fundamental Research Funds for the Central Universities of Central South University,China(2022ZZTS0493)。

摘　　要：The separation of rare earths is difficult due to their similar properties and the complex characteristics of associated vein o res.Complexation-ultrafiltration(CUF)and shear induced o rderly dissociation coupling with ultrafiltration(SIODUF)were used to separate metal ions(M,M=La(Ⅲ),Ce(Ⅳ)and Ca(Ⅱ))from simulated bastnaesite leaching solution using acidic phosphonic chitosan(aPCS)and rotating disk membrane.Effect of simultaneous removal of metallic ions was investigated by CUF,and suitable conditions were obtained for C/M 10.0(mass ratio of complexant to metal ions)and pH 5.0.The shear stabilities of aPCS-M complexes were explored at different pH values and the results show that the complexes can dissociate at a certain rotational speed,the critical one.The critical s hear rates of aPCS-La,aPCS-Ce and aPCS-Ca complexes at pH 5.0 were calculated as 1.42×10^(5).1.69×10^(5) and 9.75×10^(4) s^(-1),respectively.The order of complexes shear stability is aPCS-Ca aPCS-La<aPCS-Ce.The high selective separation of M and regeneration of aPCS were achieved by SIODUF in the light of the difference of aPCSM complexes shear stabilities.The separation coefficientsβLa/Ce andβCa/La reach 31.2 and 53.9,respectively.

关 键 词：BASTNAESITE Rare earths Complexation-ultrafiltration Acidic phosphonic chitosan Rotating disk membrane 

分 类 号：O62[理学—有机化学]