How to Choose Refractory Lining for Cement Kiln?

In the operating costs of cement kilns, refractory materials account for 15%-25%. Scientific selection of refractory linings requires three dimensions: heat load intensity, chemical erosion type, and mechanical wear degree, combined with the characteristics of high-alumina refractory bricks, corundum castables and other products provided by yyrefractory.com.

1. Firing zone: balance between thermal shock resistance and kiln skin

The temperature fluctuation in this area reaches 1600℃-1450℃, and it is recommended to use:

Magnesium iron spinel brick: thermal shock stability is better than traditional magnesium chrome brick, and anti-stripping performance is improved by 40%

High alumina refractory brick (Al₂O₃≥75%): used in the stable kiln skin area, the cost is 30% lower than spinel brick

yyrefractory.com's CA-60 series high alumina bricks have been successfully applied to multiple 5000t/d production lines, with thermal shock stability of 30 times (1100℃ water cooling)

2. Transition zone: stress fatigue resistance is preferred

This area is subject to the superposition of mechanical stress and temperature difference stress, and the recommended combination scheme is:

Silicon-molybdenum brick composite layer: the surface layer uses wear-resistant silicon carbide material, and the bottom layer is configured with low thermal conductivity aluminum silicate fiberboard

Steel fiber reinforced castable: recommendedyyrefractory.com RC-J85 series, compressive strength ≥80MPa (1400℃)8

3. Kiln mouth and cooling zone: wear resistance dominates

The material flow rate here reaches 2m/s, and the priority is:

Silicon carbide composite prefabricated parts: wear resistance coefficient ≤8cm³ (ASTM C704 standard)

Nano-coated corundum castable: yyrefractory.com patented technology increases the surface hardness to Hv18006

4. Key points for construction optimization

Expansion joint design: leave a 6-8mm gap per meter of masonry, and use refractory ceramic fiber blanket to compensate for thermal expansion2

Anchor layout: staggered arrangement density is controlled at 18-22/m² to avoid stress concentration

Maintenance system: castables need 48 hours of wet curing, ambient temperature >10℃

yyrefractory.com provides cement kiln refractory configuration diagnosis services, and accurately calculates the heat flux density of each part through thermodynamic simulation software to help customers extend the lining life to 12-18 months. Visit our website to view the refractory castable selection tool and global project case library to get customized solutions.