Cement Kiln Maintenance Shutdown | 4 Key Points for Refractory Brick Inspection| Magnesia-iron spinel brick
Jul 10,2026
Commonly used refractory bricks in cement kilns include magnesia-iron spinel, magnesia-alumina spinel, and silicon-mullite wear-resistant bricks. During kiln shutdowns for maintenance, the following four key points regarding these refractory bricks require attention:
① Thickness Measurement: Use ultrasonic thickness gauging; replacement is required if the remaining thickness is <60% of the original. Focus inspections on the burning zone and the area beneath the kiln tire.
② Visual Inspection: Immediately mark for replacement if cracks exceed 2mm, through-cracks are present, or spalling exceeds 20mm.
③ Brick Joint Condition: Check for loose closure bricks, detached mortar, and continuous (aligned) joints; ensure expansion joints remain unobstructed.
④ Chemical Attack: Look for alkali-salt crystallization on the brick surface and sulfate-induced discoloration layers; assess findings in conjunction with raw meal composition.
📌 Recommendation: Establish a log of measurement points to compare wear rates during each maintenance shutdown and predict replacement cycles in advance.
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