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›› 2015, Vol. 15 ›› Issue (2): 224-229.

• 反应与分离 • 上一篇    下一篇

硫酸介质中D2EHPA萃取In3+与Fe3+的动力学

荣浩 李兴彬 魏昶 朱如龙 李旻廷 邓志敢   

  1. 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院
  • 收稿日期:2015-01-06 修回日期:2015-02-04 出版日期:2015-05-05 发布日期:2015-05-05
  • 通讯作者: 荣浩

Extraction Kinetics of Fe3+ and In3+ from Sulfuric Acid Medium with D2EHPA

RONG Hao LI Xin-bin WEI Chang ZHU Ru-long LI Min-ting DENG Zhi-gan   

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology
  • Received:2015-01-06 Revised:2015-02-04 Online:2015-05-05 Published:2015-05-05
  • Contact: RONG Hao

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摘要： 采用恒界面池法研究了从硫酸介质中萃取In3+和Fe3+的动力学，考察了搅拌速度、界面面积、温度、萃取剂浓度、氢离子活度及硫酸根浓度对In3+, Fe3+萃取速率的影响. 结果表明，在温度25℃、搅拌转速70~240 r/min条件下，In3+以三价离子形式被萃取，萃取活化能为17.54 kJ/mol，萃取过程为扩散控制；Fe3+以FeSO4+形式被萃取，萃取活化能为52.87 kJ/mol，萃取过程为界面化学反应控制. 增加D2EHPA浓度可增大正向反应动力，提高萃取速率. 萃取过程为阳离子交换，氢离子活度增加会导致萃取速率降低，硫酸根与金属离子的络合效应会降低萃取速率. 通过动力学研究得到In3+萃取的正向速率方程为-dCIn3+/dt=10-0.378[In3+](aq)[H+](aq)-0.376[H2A2](org)0.158，Fe3+萃取的正向速率方程为-dCFe3+/dt=10-2.413[Fe3+](aq)[H+](aq)-1.526[H2A2](org)0.600.

关键词: D2EHPA, In3+, Fe3+, 萃取, 动力学, 恒界面池法

Abstract: Extraction kinetics of trivalent In3+ and Fe3+ with di(2-ethylhexyl) phosphoric acid (D2EHPA, H2A2) in kerosene from sulfuric acid medium was studied using constant interfacial area method. The effects of temperature, interfacial area, stirring speed, hydrogen ion, D2EHPA and sulfate concentration on their extraction rate were examined. The results indicated that at 25℃ and stirring speed of 70~240 r/min, the apparent activation energy of In3+ extraction was 17.54 kJ/mol and the extraction process of In3+ was controlled by diffusion, while the apparent activation energy of Fe3+ extraction was 52.87 kJ/mol, Fe3+ was extracted in FeSO4+, and the extraction process was controlled by chemical reaction at the interface. As D2EHPA concentration increased, the forward reaction force could be increased to improve the extraction rate. Because the extraction process was the cation exchange, increasing the concentration of hydrogen ion would reduce the extraction rate. Complexation of metal ion with sulfate radical would reduce the extraction rate. Under those conditions, the rate of forward In3+ extraction reaction was expressed as -dCIn3+/dt=10-0.378 [In3+](aq)[H+](aq)-0.376[H2A2](org)0.158, and that of Fe3+ as -dCFe3+/dt=10-2.431 [Fe3+](aq)[H+](aq)-1.526[H2A2](org)0.600.

Key words: D2EHPA, In3+, Fe3+, extraction, kinetics, constant interfacial area method

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