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Characteristics of metal fluctuation caused by bath-metal interface oscillation in aluminum electrolysis cells

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Abstract

Bath-metal interface oscillation reduces the stability and efficiency of Hall-Héroult cells. However, the oscillation characteristics have not been understood in detail. A well-designed probe and an online monitor system were designed for monitoring the metal fluctuation. Experiments and analyses show the metal fluctuation can be captured, and a corresponding relationship between anode-cathode distance (ACD) and anode rod voltage drop (UD) have been found. The stack phenomena of the fluctuation have been found as well. Analysis shows that the wave length (around 8 m in this experiment) is much bigger than the anode size; however, the wave velocity (around 0.27 m/s in this experiment) is relatively low. Because of the waves transmitting, anode current changes periodically but the cell voltage remains near constant when the metal is fluctuating.

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Authors and Affiliations

  1. School of Energy Science & Engineering, Central South University, Changsha, China, 410083

    Jiaqi Zhang, Naijun Zhou & Hesong Li

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  1. Jiaqi Zhang
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  2. Naijun Zhou
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  3. Hesong Li
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Correspondence to Naijun Zhou.

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Zhang, J., Zhou, N. & Li, H. Characteristics of metal fluctuation caused by bath-metal interface oscillation in aluminum electrolysis cells. JOM 62, 35–38 (2010). https://doi.org/10.1007/s11837-010-0165-9

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  • DOI: https://doi.org/10.1007/s11837-010-0165-9

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