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›› 2010, Vol. 10 ›› Issue (5): 981-986.

• 材料工程专栏 • Previous Articles     Next Articles

Effects of Additive Choline Chloride on Electrolysis of Aluminum from [Bmim]Cl-AlCl3 Ionic Liquid System

LI Yan HUA Yi-xin ZHANG Qi-bo PEI Qi-fei CUI Yan XU Cun-ying TIAN Guo-cai   

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P.R. China Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technolog Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technolog Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technolog Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technolog Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technolog Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technolog
  • Received:2010-07-19 Revised:2010-09-19 Online:2010-10-20 Published:2010-10-20
  • Contact: HUA Yi-xin

氯化胆碱添加剂对[Bmim]Cl-AlCl3离子液体体系电解精炼铝的影响

李艳 华一新 张启波 裴启飞 崔焱 徐存英 田国才   

  1. 昆明理工大学冶金与能源工程学院 昆明理工大学材料与冶金工程学院 昆明理工大学材料与冶金工程学院 昆明理工大学材料与冶金工程学院 昆明理工大学材料与冶金工程学院 昆明理工大学材料与冶金工程学院 昆明理工大学材料与冶金工程学院
  • 通讯作者: 华一新

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Abstract: The effects of additive choline chloride (ChCl) on electrical conductivity of [Bmim]Cl-AlCl3 ionic liquid (molar fraction of AlCl3 was 0.667) system and electrorefining of aluminum in the system were investigated. The results indicated that electrical conductivity of the system increased obviously with increasing the concentration of ChCl (CChCl) when CChCl was less than 8 mmol/L. However, electrical conductivity decreased with further increasing CChCl. The peak potential shifted positively and the peak current decreased in the presence of ChCl. Constant current electrolysis experiments at 373 K of temperature and 50 A/m2 of current density indicated that the cell voltage decreased significantly, the current efficiency enhanced (nearly 100%), and the energy consumption was 0.611 kW×h/kg which was only 50% of the pure ionic liquid system when the concentration of ChCl was 5 mmol/L. Moreover, the deposit obtained on alloy steel was well-adherent, dense and fine-grained.

Key words: aluminum, [Bmim]Cl-AlCl3 ionic liquid, additive, choline chloride, electrolysis

摘要： 研究了AlCl3摩尔分数为0.667的[Bmim]Cl-AlCl3离子液体体系中氯化胆碱(ChCl)添加剂对体系电导率及电解精炼铝的影响. 结果表明，当ChCl浓度小于8 mmol/L时，体系的电导率随ChCl浓度增加而显著提高，但ChCl浓度进一步增加体系的电导率逐渐降低. 添加少量ChCl后，阴极还原峰电位正移，还原峰电流逐渐降低. 在温度373 K和电流密度50 A/m2条件下添加5 mmol/L ChCl进行恒电流电解，电解过程的槽电压显著降低，阴极电流效率显著提高(接近100%)，直流电耗仅为0.611 kW×h/kg，只有纯离子液体体系电解铝的50%，且在低碳钢基体上得到的铝沉积层光滑致密、晶粒细化.

关键词: 铝, [Bmim]Cl-AlCl3离子液体, 添加剂, 氯化胆碱, 电解

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