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Low temperature aluminium electrolysis in a high density electrolyte

机译：高密度电解液中的低温铝电解

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摘要

Aluminium electrolysis experiments were carried out in a fluoride electrolyte with density higher than that of liquid aluminium, whereby the metal produced floated on top of the electrolyte. The electrolyte composition in weight-% was: NaF: 18, A1F_3∶48, CaF_2∶16 and BaF_2∶18. The so-called 'slurry cell' concept was adopted by adding fine-grained alumina in excess of the solubility limit of the electrolyte. The excess alumina was kept in suspension by the gas-induced convec tion created by an inert anode, located at the bottom of the cell. A vertically ar ranged slab of TiB_2 was used as cathode, while platinum, tin oxide and nickel-fer rite were tested as inert oxygen-evolving anodes. In one day experiments, current efficiencies in the range of 72-92% were achieved. This is comparable to the cur rent efficiency typical for laboratory experiments with Hall-Heroult electrolyte in cells of similar size as that used in this experiment.
机译：在密度高于液态铝的氟化物电解质中进行了铝电解实验，由此产生的金属漂浮在电解质的顶部。电解质组合物的重量％为：NaF：18，AlF_3∶48，CaF_2∶16和BaF_2∶18。通过添加超过电解质溶解度极限的细粒氧化铝来采用所谓的“浆液池”概念。过量的氧化铝通过位于电池底部的惰性阳极产生的气体对流而保持悬浮状态。垂直排列的TiB_2平板用作阴极，而铂，氧化锡和镍铁氧体作为惰性的放氧阳极进行了测试。在一天的实验中，电流效率达到72-92％的范围。这与使用霍尔-赫洛尔特电解液在与本实验中使用的电池尺寸相似的电池进行实验室实验时典型的电流效率相当。

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  • 来源
    《Aluminium》 |2011年第5期|p.59-63|共5页
  • 作者

    S. Rolseth; H. Gudbrandsen; J. Thonstad;

  • 作者单位

    Sverre Rolseth and Henrik Gudbrandsen are with SINTEF Materials and Chemistry, Trondheim, Norway;

    Sverre Rolseth and Henrik Gudbrandsen are with SINTEF Materials and Chemistry, Trondheim, Norway;

    Jomar Thonstad is with The Norwegian University of Science and Technology (NTNU), Trondheim, Norway;

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