Protection of Cast Iron Sections of Gas-Collecting Bell of Soderberg Electrolysis Cell

Abstract:

The work is devoted to the actual problem of corrosion of the gas-collecting bell of the Soderberg electrolysis cell, which operates in close proximity to the molten electrolyte. Due to gas corrosion during the operation of the electrolysis cell, the cast-iron sections are destroyed and the release of anode gases into the atmosphere of the housing occurs. Iron-containing corrosion products falling into the melt of primary aluminum reduce its quality and grade. In order to prevent this phenomenon, the effectiveness of their protection with a dry mixture for obtaining a protective oxide-ceramic coating of cast-iron surfaces of gas-collecting bell is studied. The results obtained proved the effectiveness of the proposed coating: the service life of the gas-collecting bell sections increased by 4 times. After applying the protective coating for A85 grade aluminum, it increased from 2 to 24%, and the share of A7 grade aluminum decreased from 25 to 18 %.

• Periodical: Materials Science Forum (Volume 1052)
• Pages: 238-243
• DOI: https://doi.org/10.4028/p-wrd90w
• Online since: February 2022
• Authors: Vladimir A. Sokolnikov, Andrey A. Tyutrin*
• Keywords: Collection of Anode Gases, Electrolysis Cell, Gas Corrosion, Gas-Collecting Bell, High-Temperature Corrosion, Protective Coating

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