摘要
考察了锌对AlCl3-BMIC离子液体电解槽炼铝的影响。结果表明:锌的氧化电位相对于铝为0.23V,铝中含锌其钝化电位负移。随着阳极锌含量增加,阴极铝沉积物中的锌含量升高,阳极含锌量为4%时,阴极中锌含量只有阳极含量的1/62,电流效率在94%以上,能耗在1.58kWh/kg-Al～1.68kWh/kg-Al;随着离子液体中Zn(II)的增加,阴极沉积物锌含量增加,铝电沉积的电流效率会有少量的降低,槽电压和能耗变化不大。SEM研究发现,随着沉积层锌含量的增加,晶粒细化,沉积层表面更加平整致密。
The infuence of zinc on electrorefining of aluminium from AlCl3 - BMIC ionic liquid was investigated. The linear sweep vohammetry results indicated that the initial dissolution potential of zinc landed at about 0. 23 V （vs Al（III）/Al） and the passivation potential of Al -Zn anodes has obviously negative shift compared to purity aluminium. With increasing zinc concentration in anode, the zinc content of the aluminium deposits increased, but the current efficiency was kept above 94% ,and then the energy consumption ranged from 1.58kWh/kg - Al to 1.68kWh/kg - Al. When zinc concentration in anode was 4% ,the zinc has a high depletion factor of 1/62. The zinc content of the aluminium deposits also increased with increasing Zn（II） concentration in the ionic liquid, but the addition of Zn （II） decreased current efficieney. The deposits from ionic liquid with Zn （1I） became more compaet and grain size decreased when the Zn（II） concentration was increased from 0 mg/L to 100 mg/L.
出处
《轻金属》
CSCD
北大核心
2012年第7期41-45,共5页
Light Metals
基金
国家自然科学基金资助项目(50864009)
关键词
离子液体
铝
锌
电解精炼
ionic liquid
aluminium
zinc
electrorefining
