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研究了摩尔比为1:2的BMIC-AlCl3离子液体中杂质元素Zn,Fe和Cu对电解精炼铝的影响.结果表明,离子液体中Zn(II)/Zn,Fe(II)/Fe和Cu(I)/Cu相对于Al(III)/Al的平衡电极电势分别为0.21,0.63和0.64V,比其标准电极电势相对值小得多;在温度80℃和电流密度100A/m2条件下进行电解精炼,铝合金阳极中的绝大部分Zn,Fe和Cu杂质被去除,阴极铝沉积层中杂质含量随阳极杂质含量增加而升高,但杂质的贫化率降低,电流效率均超过94%,能耗为1.59～1.74kW·h/kg;电解精炼铝含量为75.3%(ω)工业铝合金得到了纯度超过99.8%的金属铝,且沉积层致密平整.
The effects of Zn, Fe and Cu on the electrolytic refining of aluminum in BMIC-AlCl3 ionic liquid with molar ratio of 1: 2 were studied. The results show that Zn (II) / Zn, Fe (II) The equilibrium electrode potentials of (I) / Cu with respect to Al (III) / Al were 0.21, 0.63 and 0.64 V, respectively, which were much smaller than the relative values of their standard electrode potentials; at a temperature of 80C and a current density of 100 A / In the electrolytic refining, most of the Zn, Fe and Cu impurities in the aluminum alloy anode are removed, and the impurity content in the cathode aluminum deposition layer increases with the anode impurity content, but the impurity depletion rate decreases, and the current efficiency exceeds 94% , Energy consumption of 1.59 ~ 1.74kW · h / kg; electrolytic refining of aluminum content of 75.3% (ω) industrial aluminum purity of more than 99.8% of the aluminum obtained, and the formation of dense formation.