Solvent Extraction of La(III) from Chloride Medium in the Presence of Two Water Soluble Complexing Agents with di-(2-ethylhexyl) Phosphoric Acid

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• 作者：Shaohua Yin ; Wenyuan Wu ; Xue Bian ; Yao Luo ; Fengyun Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：June 26, 2013
• 年：2013
• 卷：52
• 期：25
• 页码：8558-8564
• 全文大小：318K
• 年卷期：v.52,no.25(June 26, 2013)
• ISSN：1520-5045

文摘

The extraction of single La(III) from chloride medium with di-(2-ethylhexyl) phosphoric acid (P204) in the presence of two complexing agents, lactic acid (LA) and citric acid (H₃cit), is investigated. The results show that separation factors (尾) between some light rare earths are higher than those in the conventional extraction systems under the same conditions, indicating that this system would be suitable for the extraction and separation. The equilibrium constants and thermodynamic functions, 螖H, 螖G, and 螖S, are calculated, and the cation exchange mechanism is also clarified by Fourier transform infrared (FTIR) spectroscopy. The recycling experiments also indicate that the two complexing agents can be effectively recycled, and the total chemical oxygen demand (COD) value in the raffinate is 65.84 mg/L, which meets the 鈥淓mission Standards of Pollutants from Rare Earths Industry鈥?from the Ministry of Environmental Protection, People鈥檚 Republic of China (2006). The results demonstrate that this system could be regarded as a promising green and effective separation technology.