Key Performance Indicators of Refractory Bricks for Cement Kilns
May 28,2026
1. Refractoriness
Refers to a material's ability to withstand high-temperature melting. In the firing zone of a cement kiln, temperatures exceed 1400°C; insufficient refractoriness will lead to softening and collapse, making this a fundamental indicator of heat resistance.
2. Bulk Density & Apparent Porosity
The higher the density and the lower the porosity, the denser the brick structure becomes. This effectively blocks corrosion by alkalis and sulfur within the kiln, as well as slag penetration, thereby significantly delaying brick deterioration.
3. Cold Crushing Strength
Reflects the material's resistance to compressive forces and abrasion by kiln charge. Inside a cement kiln, raw materials are subject to continuous friction and impact; insufficient strength makes the bricks prone to wear and spalling.
4. Thermal Shock Stability
Kiln startups, shutdowns, and load fluctuations generate severe temperature gradients. This indicator represents the material's ability to withstand rapid heating and cooling; poor stability leads to surface spalling and cracking.
5. Refractoriness Under Load (RUL)
The temperature at which a refractory brick begins to deform while under both high-temperature and compressive load conditions. As the kiln shell rotates and the bricks exert pressure on one another, failure to meet this standard can result in bulging, deformation, or even lead to "red kiln" incidents (localized overheating of the kiln shell).
6. Permanent Linear Change (Reheating Shrinkage/Expansion)
The degree of expansion or shrinkage exhibited by the material after prolonged exposure to high temperatures. Excessive dimensional change can cause joints between bricks to widen and the masonry to loosen, thereby compromising the structural integrity of the entire kiln lining.
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