Aluminum Electrolytic Cell · Sidewall
The sidewall of an aluminum reduction cell is key to cell structure. Sidewall bricks long-term contact high-temperature electrolyte (950–970℃) and aluminum, bearing thermal shock and mechanical action. Sidewall SiC-brick erosion and thinning limit cell life.
Electrolyte attack: molten electrolyte (cryolite) chemically attacks and dissolves the brick surface. Aluminum attack: aluminum contacts the bricks, with worse attack at the electrolyte-aluminum interface. Thermal shock: cell start/stop and operation fluctuations cause temperature changes, thermally cracking the bricks. Oxidation: SiC bricks oxidize on the surface at high temperature (SiC→SiO₂), forming a loose layer.
After thinning, sidewall insulation degrades, heat loss rises and electrolysis energy consumption increases; in severe cases electrolyte or aluminum penetrates the sidewall with a cell-leak risk, forcing cell shutdown and shortening cell life.
Select sidewalls for "high electrolyte resistance + high thermal conductivity":
Masonry control: lay sidewall bricks with staggered joints ≤1.5mm and full mortar. Oxidation protection: avoid prolonged exposure of SiC surfaces to oxidizing atmosphere; cover promptly. Cell baking: follow the curve to avoid residual moisture.
Control electrolyte composition and temperature, stabilizing cell condition; monitor sidewall temperature distribution and crust state, adjusting promptly on anomalies. At maintenance, check sidewall residual thickness and replace thinned zones; record erosion data to optimize grade and cell management.
Si3N4 bonded SiC brick is made of high-purity silicon carbide with in-situ formed silicon nitride bond, featuring excellent thermal shock resistance, high strength, high thermal conductivity and oxidation resistance for blast furnace tuyeres, aluminum cell sidewalls and kiln furniture.
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Silicon carbide brick (SiC≥85%, refractoriness ≥1900℃, CCS≥120MPa) offers high thermal conductivity, extreme wear resistance, thermal-shock resistance and molten-salt resistance—preferred for waste incineration and hot abrasion duties.
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Corundum brick with Al₂O₃≥99% and refractoriness ≥2000℃ is chemically pure, resisting high temperature and gas/dust scouring—the premium refractory for critical hot zones.
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