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The aluminiumAluminium industryIndustry is concerned by the predicted quality changes in available petroleum cokesPetroleum coke used for prebaked carbon anodesCarbon anode. The knowledge on the effects of high-sulfur cokes on the electrochemical performance is limited in the industryIndustry. In this study, the electrochemical performance related to voltage oscillationsVoltage oscillations caused by bubble formation on the horizontal surfaceSurface of the anodeAnode is investigated with respect to both coke quality and anodeAnode properties. Pilot anodesAnode made from five industrial cokes, ranging in sulfur content from 1.4 to 5.5 wt% were studied. For anodesAnode produced with anisotropic cokes, voltage oscillationsVoltage oscillations are observed in the range of 0.25–0.36 V, with the maximum screening due to the bubbles in the 40–50% range. These values correlate with the anodeAnode properties, rather than differences between the anisotropic cokes. Among the anisotropic anodesAnode, the most permeable anodeAnode resulted in the lowest voltage oscillationsVoltage oscillations, similar to the observations for the anodeAnode made from isotropic coke. The positive effect on electrochemical behaviour related to bubbles for the isotropic anodeAnode is likely an indirect effect of the coke quality and characteristics.

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Electrochemical Characterization of Bubble Behaviour on Pilot Anodes with Varying Porosity and Coke Quality

  • 会议论文

  • 发表日期：

    2025年

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  • Gøril Jahrsengene,
  • Arne Petter Ratvik,
  • Lorentz Petter Lossius,
  • Ann Mari Svensson

摘要

The aluminiumAluminium industryIndustry is concerned by the predicted quality changes in available petroleum cokesPetroleum coke used for prebaked carbon anodesCarbon anode. The knowledge on the effects of high-sulfur cokes on the electrochemical performance is limited in the industryIndustry. In this study, the electrochemical performance related to voltage oscillationsVoltage oscillations caused by bubble formation on the horizontal surfaceSurface of the anodeAnode is investigated with respect to both coke quality and anodeAnode properties. Pilot anodesAnode made from five industrial cokes, ranging in sulfur content from 1.4 to 5.5 wt% were studied. For anodesAnode produced with anisotropic cokes, voltage oscillationsVoltage oscillations are observed in the range of 0.25–0.36 V, with the maximum screening due to the bubbles in the 40–50% range. These values correlate with the anodeAnode properties, rather than differences between the anisotropic cokes. Among the anisotropic anodesAnode, the most permeable anodeAnode resulted in the lowest voltage oscillationsVoltage oscillations, similar to the observations for the anodeAnode made from isotropic coke. The positive effect on electrochemical behaviour related to bubbles for the isotropic anodeAnode is likely an indirect effect of the coke quality and characteristics.