四甲基氯化铵对AlCl_3-BMIC离子液体体系在铜基体上电解精炼铝的影响  

Effect of tetramethyl ammonium chloride on aluminium electrorefining on copper substrates in AlCl3-BMIC ionic liquid system

作　　者：李艳[1] 华一新[1] 张启波[1] 王波[1] 裴启飞[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《轻金属》2011年第6期33-36,共4页Light Metals

基　　金：国家自然科学基金资助项目(50864009;50904031);高等学校博士学科点专项科研基金资助项目(20070674001)

摘　　要：讨论了四甲基氯化铵(TMAC)对AlCl3-BMIC(AlCl3摩尔分数为0.667)离子液体体系在铜基体上低温电解精炼铝过程中的电流效率、槽电压和能耗的影响。结果表明:TMAC的加入能够提高电流效率,降低槽电压和能耗;且在铜基体上能够得到光亮、平整致密、晶粒细化的铝沉积层。当TMAC加入量为0.02mol/L时,能够获得最大电流效率(91%)和最低能耗(0.861kWh/kg-Al);而且阴极极化曲线表明,阴极铝还原峰电位逐渐向正方向移动,TMAC对电解精炼铝过程中的铝电还原有去极化影响。所有实验条件下,铜基体上所得铝沉积层的纯度超过99.9%。The effect of a novel additive tetramethyl ammonium chloride（TMAC） on the current efficiency,cell voltage and energy consumption during the electrorefining of aluminum in AlCl3-BMIC（molar fraction of AlCl3 is 0.667） ionic liquid system at low temperature was investigated.The addition of TMAC was found to increase current efficiency,reduce cell voltage and energy consumption along with producing bright,well-adherent and fine-grained aluminum deposits on copper substrates.Maximum current efficiency（91%） and minimum energy consumption（0.861kWh/kg-Al） were obtained at the addition dosage of 0.02mol/L.Moreover,the cathodic polarization results showed that the additive had a depolarization effect on aluminum electroreduction during the electrorefining process,suggesting by a progressively positive moving of the cathodic peak potential with the addition of TMAC.In all cases,the aluminium deposits with purity higher than 99.9% were obtained on copper substrates.

关 键 词：铝 AlCl3-BMIC离子液体 四甲基氯化铵 电解精炼 

分 类 号：TF821[冶金工程—有色金属冶金]