Molten solvent extraction behavior of trivalent La, Sm, Dy, and Yb withtri-n-butyl phosphate into mo

• 作 者: PENG Bo GAO Jinzhang Fan Haiyan Kang Jingwan YANG Wu
• 机 构: Department of Chemistry, Northwest Normal University, Lanzhou 730070, China
• 出 处: 稀有金属(英文版)
• 发表日期: 2002年1期
• 关键词: solvent extraction rare earth TBP paraffin wax

The extraction behavior of La3+, Sm3+, Dy3+, and Yb3+ in sodium acetate-acetic acid medium was studied with tri-n-butyl phosphate (TBP) at 60 ℃ using paraffin wax as a diluent. The extraction percentage is greater than 85% in the pH range of 6 to 8. The result of slope analysis method indicates that the compositions of the extracted species are different between the light and heavy rare earths. The formula of the extracted species is found to be La(TBP)(OH)(Ac)2for La3+ and Yb(TBP)(OH)3 for Yb3+. The effects of extracting time, the concentration of TBP in the organic phase and salts on the extraction efficiency were also discussed.