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在纯氟化物电解质体系下,以原Al为阳极,利用杂质与Al析出电位的差别,采用水平电解槽进行了Al的电解精炼提纯研究.结果表明:水平电解槽导致的电流密度分布不均没有对精炼过程造成不利影响,电解过程槽电压平稳;预电解对电解质净化效果明显,预电解后电解质中Cu,Si和P的含量分别降低到3.2×10~(-6),14×10~(-6)和1.5×10~(-6).与三层液精炼Al相比,水平精炼阴极Al是沉底的,受上层电解质保护从而减少了烧损,电流效率最高达98.6%.最后得到的精炼Al与原Al相比,Fe,Si,Zn和Cu等杂质的含量明显降低,特别是Cu含量由14.5×10~(-6)减少到0.9×10~(-6),精Al纯度达到99.99%.
In the pure fluoride electrolyte system, using the original Al as the anode, the difference of the deposition potential of Al and Al was exploited, and the electrolysis purification purification of Al was carried out by using the horizontal electrolytic cell.The results showed that the current density distribution in the horizontal cell was not uniform The electrolysis process tank voltage is stable; pre-electrolysis of the electrolyte purification effect is obvious, after pre-electrolysis electrolyte Cu, Si and P content were reduced to 3.2 × 10 -6, 14 × 10 ~ ( -6) and 1.5 × 10 -6 As compared with the three-layer refining of Al, the level-refined cathode Al is submerged and protected by the upper layer of electrolyte, thereby reducing the burning loss and achieving a current efficiency of up to 98.6%. Finally, Compared with the original Al, the content of impurities such as Fe, Si, Zn and Cu decreased obviously, especially the content of Cu reduced from 14.5 × 10 -6 to 0.9 × 10 -6. The purity of refined Al Reached 99.99%.