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Anodic behavior of the NiO-Fe2O3-Cr2O3-Cu composite during the low-temperature electrolysis of aluminum

  • Metallurgy of Nonferrous Metals
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Abstract

In order to fabricate oxide-metallic composites with the composition 25.3NiO-41.2Fe2O3-13.5Cr2O3-20.0Cu (wt %), the temperature and duration of sintering (1350°C, 30 min) that ensure the formation of the solid solution of chromium oxide in nickel ferrite have been determined. This material is tested as an anode for the electrolysis of the low-temperature solution with the composition 12.0NaF-36.8KF-51.2AlF3 (wt %), which was saturated with Al2O3 (t = 800°C). The amount of gaseous oxygen evolved on the anode was measured. It is shown that the main reaction on an anode at current density i = 0.015–1.0 A cm−2 is the oxidation of oxygen-containing anions from a melt with the formation of gaseous O2 and a substantial increase in the oxidation rate of the composite anode is observed at i > 1.0 A cm−2. The voltage across the electrolyzer (4.5 ± 0.5 V) and the anodic potential (2.43 ± 0.2 relative to the Al reference electrode) during a prolonged experiment (for 89 h, i = 0.4 A cm−2) indicate a stable and acceptable electrical conductivity of the material, while the dissolution rate, which was calculated by the weight loss (0.6 kg/yr) and volume loss (0.7 cm/yr), satisfy the requirements to inert anodes.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, ul. Akademicheskaya 20, Yekaterinburg, 620990, Russia

    V. A. Kovrov, A. P. Khramov & Yu. P. Zaikov

  2. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, ul. Amundsena 101, Yekaterinburg, 620016, Russia

    V. M. Chumarev & E. N. Selivanov

Authors
  1. V. A. Kovrov
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  2. A. P. Khramov
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  3. Yu. P. Zaikov
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  4. V. M. Chumarev
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  5. E. N. Selivanov
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Corresponding author

Correspondence to V. A. Kovrov.

Additional information

Original Russian Text © V.A. Kovrov, A.P. Khramov, Yu.P. Zaikov, V.M. Chumarev, E.N. Selivanov, 2013, published in Izvestiya VUZ. Tsvetnaya Metallurgiya, 2013, No. 6, pp. 3–8.

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Kovrov, V.A., Khramov, A.P., Zaikov, Y.P. et al. Anodic behavior of the NiO-Fe2O3-Cr2O3-Cu composite during the low-temperature electrolysis of aluminum. Russ. J. Non-ferrous Metals 55, 8–14 (2014). https://doi.org/10.3103/S106782121401009X

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  • DOI: https://doi.org/10.3103/S106782121401009X

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