湿法冶金2025，Vol.44Issue(6)：707-716,10.DOI:10.13355/j.cnki.sfyj.2025.06.001
酸性膦混合体系协同萃取重稀土性能研究
Synergistic Extraction of Heavy Rare Earths Using Acidic Phosphine Mixed System
摘要
Abstract
The extraction and separation of heavy rare earths(HREs)by a mixed extraction system composed of N,N'-di(2-ethylhexyl)aminomethyl phosphonic acid mono-2-ethylhexyl ester(HEDEAP,H2A2),2-ethylhexylphosphonic acid mono-2-ethylhexyl ester(P507,H2B2)and n-heptane were investigated.The results show that the HEDEAP-P507 mixed system exhibits positive synergistic effects on HREs extraction.Under optimal conditions(HEDEAP molar fraction of 0.4,pH 2.0,phase ratio(Vo∶Va)of 1∶1 and temperature of 25 ℃),the maximum synergistic coefficient for Lu(Ⅲ)extraction can reach 1.42.The separation factors for Y/Ho,Er/Y,Tm/Er,Yb/Tm and Lu/Yb are determined as 1.67,1.76,4.5,1.67 and 2.11,respectively,surpassing those of the single P507 system.FT-IR analysis result reveals the participation of P—OH and P=O groups in coordination reactions.Slope analysis indicates the possible formation of REH3A2B2Cl2 as the synergistic complexes.The loading capacity of the mixed system containing 12％HEDEAP and 18％P507 for Lu(Ⅲ)is measured to be 32.4 g/L(calculated as Lu2O3).The HREs loaded in the mixed system is easy to be stripping.The Lu(Ⅲ)stripping rate is 80％with 1.0 mol/L HCl,and the stripping acidity required for the same stripping rate is much lower than of P507 system(4.0 mol/L).Compared to the sole P507 system,the HEDEAP-P507 mixed system significantly enhances extraction selectivity for HREs while reducing stripping acidity requirements,demonstrating substantial scientific significance and promising application potential for selective separation of HREs.关键词
重稀土/分离/协同萃取/胺基膦酸/P507Key words
heavy rare earths/separation/synergistic extraction/aminophosphonic acid/P507分类
能源科技引用本文复制引用
陈露燕,周杰,邓必成,况王强,周洁英,黄亚斌,邝圣庭,廖伍平..酸性膦混合体系协同萃取重稀土性能研究[J].湿法冶金,2025,44(6):707-716,10.基金项目
国家重点研发计划项目(2022YFC2905201) （2022YFC2905201）
中国科协青年人才托举工程项目(2022NQRC001) （2022NQRC001）
江西省重点研发计划项目(20243BBG71021,20252BCE31002) （20243BBG71021,20252BCE31002）
江西省"双千计划"(JXSQ2020101005) （JXSQ2020101005）
赣州市重点研发计划项目(GZ2024ZDZ004) （GZ2024ZDZ004）
赣州市"苏区之光"(GZSQZG202301018). （GZSQZG202301018）
