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Refractories and Industrial Ceramics

, Volume 59, Issue 3, pp 278–286 | Cite as

Features of Using Modified Carbon-Graphite Lining Materials in Aluminum Electrolyzers

  • A. V. Saitov
  • V. Yu. BazhinEmail author
Article
  • 16 Downloads

Penetration of sodium into carbon-graphite material (CGM) specimens previously modified with lithium is studied. Sodium diffusion coefficients are calculated after treating CGM with lithium vapor and values are determined for activation energy of diffusion under different conditions. The kinetic dependences obtained make it possible to determine the sodium diffusion mechanism in modified CGM. The efficiency is demonstrated of preliminary treatment with lithium vapor that makes it possible to prevent aluminum electrolyzer cathode lining surface layer breakdown during operation. The tests on CGM specimens performed make it possible to create prerequisites for developing technology for hearth surface protection from sodium penetration during electrolysis in molten cryolite-alumina.

Keywords

carbon-graphite material (CGM) aluminum electrolyzer molten cryolite-alumina (MCA) lithium intercalation cathode unit diffusion coefficient activation energy 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.FGBOU VO St. Petersburg Mining UniversitySt. PetersburgRussia

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