Extraction and Stripping of Ytterbium (Ⅲ) from H2SO4 Medium by Cyanex 923
来源期刊：JOURNAL OF RARE EARTHS2006年第6期
论文作者：Li Hongfei Meng Shulan Li Deqian Wang Weiwei Wang Xianglan
Key words：extraction; stripping; thermodynamics; ytterbium; Cyanex 923; rare earths;
Abstract: The extraction and stripping of ytterbium(Ⅲ) from sulfuric acid medium using Cyanex 923 in heptane solution was investigated. The effects of extractant concentration, pH and sulfate ion as well as stripping agents, acidity and temperature on the extraction and stripping were studied. The equilibrium constants and thermodynamic parameters, such as ΔH (10.76 kJ·mol-1), ΔG (-79.26 kJ·mol-1) and ΔS (292.41 J·K-1·mol-1), were calculated. The extraction mechanism and the complex species extracted were determined by slope analysis and FTIR spectra. Furthermore, it was found that the extraction of Yb (Ⅲ) from sulfuric acid medium by Cyanex 923 increased with pH, concentration of SO42-, HSO4-, and extractant concentration, and approximately a quantitative extraction of Yb(Ⅲ) was achieved at an equilibrium pH near 3.0, and the extracted complex was YbSO4(HSO4)·2Cyanex923(o).
Li Hongfei1，Meng Shulan1，Li Deqian1，Wang Weiwei1，Wang Xianglan1
(1.Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Changchun 130022, China;
2.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China)
Abstract:The extraction and stripping of ytterbium(Ⅲ) from sulfuric acid medium using Cyanex 923 in heptane solution was investigated. The effects of extractant concentration, pH and sulfate ion as well as stripping agents, acidity and temperature on the extraction and stripping were studied. The equilibrium constants and thermodynamic parameters, such as ΔH (10.76 kJ·mol-1), ΔG (-79.26 kJ·mol-1) and ΔS (292.41 J·K-1·mol-1), were calculated. The extraction mechanism and the complex species extracted were determined by slope analysis and FTIR spectra. Furthermore, it was found that the extraction of Yb (Ⅲ) from sulfuric acid medium by Cyanex 923 increased with pH, concentration of SO42-, HSO4-, and extractant concentration, and approximately a quantitative extraction of Yb(Ⅲ) was achieved at an equilibrium pH near 3.0, and the extracted complex was YbSO4(HSO4)·2Cyanex923(o).
Key words:extraction; stripping; thermodynamics; ytterbium; Cyanex 923; rare earths;
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