Transfer Processes in the Bath of High Amperage Aluminium Reduction Cell

Zavadyak, Andrey V.; Polyakov, P. V.; Yasinskiy, Andrey; Puzanov, Iliya I.; Mikhalev, Yuri G.; Шахрай, С. Г.; Sharypov, N. A.; Yushkova, O. V.; Polyakov, А. А.

doi:10.1007/978-3-030-05864-7_94

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“…The obtained experimental results and suggestions are generally consistent with the theories of mass transfer processes occurring during the electrolysis of the conventional cryolite-alumina melt. [44][45][46][47][48] For example, according to the model calculations, the [NaF]/[AlF 3 ] molar ratio of the cryolite-alumina melt in the near-cathode layer can change from 2.3 to 2.9 mol mol −1 during electrolysis. A comparison between the mass transfer processes in the KF-AlF 3 -based melts and conventional cryolite-alumina melt seems to be a separate study.…”

Section: [ ] mentioning

confidence: 99%

Towards the Stability of Low-Temperature Aluminum Electrolysis

Suzdaltsev

Nikolaev

Zaikov

2021

J. Electrochem. Soc.

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The results of several different tests related to the low-temperature aluminum electrolysis were considered in this work. The role of mass transfer processes in the anode-cathode space was recommended to be significant during electrolysis in the low-temperature KF-AlF3 and NaF-AlF3-based melts. The stationary polarization and voltammetry methods were applied in order to study the kinetics of the electrode processes on the carbon and metal electrodes in the KF-AlF3-Al2O3 melts and to select the electrolysis parameters. The schemes of electrode processes were suggested on the basis of electrochemical tests, the flows of substances in the anode-cathode distance were analyzed and the main reasons of the cathode current efficiency decrease during the low-temperature electrolysis in the KF-AlF3-Al2O3 and KF-NaF-AlF3-Al2O3 melts were discussed. It was revealed that the cathode current density should not exceed 0.4–0.55 A cm−2 during the electrolysis at 750 °C–800 °C.

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