Aluminum Electrolytic Cell · Rim
The rim (superstructure edge) of an aluminum reduction cell protects the cell top and supports anodes and operation platforms. Its castable constantly faces electrolyte splash, high-temperature radiation and mechanical impact, cracking and failing—a weak point of the cell superstructure.
Electrolyte splash attack: electrolyte droplets splash onto the rim during electrolysis; high-temperature (950–970℃) electrolyte reacts with and attacks the castable. High-temperature radiation: cell heat continuously radiates the rim, aging the castable over time. Mechanical impact: anode changes, crust breaking and tapping tools impact the rim. Thermal shock: cell start/stop and operation fluctuations cause temperature changes.
After rim damage, electrolyte leakage risk rises and cell insulation degrades; impact and attack deform the rim, hurting operation safety and cell life, requiring frequent patching and replacement.
Select the cell rim for "electrolyte resistance + impact resistance":
Formwork casting: cast per design with smooth edges. Vibration: vibrate fully for density. Surface treatment: finish flat with an anti-penetration coating. Curing: control curing and reach strength before service.
Standardize operations to reduce rim impact; inspect rim surfaces regularly and patch cracks and damage promptly. At maintenance, assess overall rim condition, replacing severely damaged sections and optimizing grade.
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LA-60 high-alumina castable uses bauxite clinker aggregate with Al₂O₃≥60% and a max service temperature of 1600℃. Its low-cement bond gives high density and good thermal-shock resistance.
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