Studies on synergistic solvent extraction of rare earth elements from nitrate medium by mixtures of 8-hydroxyquinoline with Cyanex 301 or Cyanex 302

• Published in: Journal of rare earths Vol. 31; no. 6; pp. 604 - 608
• Main Author: 田苗苗 贾琼 廖伍平
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2013
• Subjects: 8-hydroxyquinoline; Constants; Cyanex; Cyanex 301; Cyanex 302; extraction; Moles; Nitrates; Rare earth elements; Rare earth metals; Samarium; Slopes; Solvent extraction; Thermodynamics; Yttrium; 二元混合物; 协同系统; 溶剂萃取; 硝酸介质; 稀土元素; 羟基喹啉; 8-hydroxyquinoline; extraction; Cyanex 301; rare earth elements; Cyanex 302
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(12)60328-7

Synergistic solvent extraction of rare earth elements （REEs） from nitrate medium was investigated with mixtures of 8-hydroxyquinoline （HQ） and acidic organophosphorus extractants, bis（2,4,4-trimethylpentyl） dithiophosphinic acid （Cyanex 301） and bis（2,4,4-trimethylpentyl） monothiophosphinic acid （Cyanex 302）. The extraction behavior of Cyanex 301/Cyanex 302 and their binary mixtures with HQ towards several lanthanoids （La, Nd, Sm, Tb, Ho, Tm） and yttrium （Y） was investigated. The separation ability of REEs was studied according to the various extraction effects. The extraction mechanisms for yttrium were studied with the methods of slope analysis and constant moles in the synergistic systems. The extracted compounds, the equilibrium constants, and thermodynamic functions were also determined.