Refractory lining material recommendation for cement rotary kiln

Following the constantly improvement of cement industry, rotary kiln as the core part of cement production lines is developing to be large scale short kiln, but the process is more complicated and more strictly requirement on refractory materials. SIJIHUO REFRACTORY analyzed the matched refractory materials for rotary kiln linings for reference.

Normally, rotary kiln can be with wet process and dry process types, both includes below woking zones: Discharge end/outlet zone, Lower transition zone, central burning zone, Upper transition zone, Safety Zone, Preheating zone/Calcining zone, Chain zone, Inlet zone, Inlet

$Refractory lining material recommendation for cement rotary kiln$

Refractory lining recommendation for different zones:

Inlet zone

Phosphate combined with high alumina brick
Anti-spalling high alumina brick
Alkali-resistant fire brick
Anti-skinning SiC castable

Lower transition zone

Lower transition zone operating temperature is lower, but ling bricks should be with lower thermal conductivity, and wear resistance. Economic choice is anti-spalling high alumina brick, but high alumina brick with SiC is superb on chemical and physical properties, and more longer service life.

Anti-spalling high alumina brick
High alumina brick with SiC/ Silica-mullite brick

Upper transition zone

Upper transition zone lining is quite unstable, it requests lining bricks with good thermal shock resistance, also lower thermal conductivity, and wear resistance characters. In the global market, Magnesia spinel brick is widely used in cement kiln linings, but Magnesia brick is with higher thermal conductivity compared with China high alumina with SiC. And today silica-mullite brick is also the best option for large scale cement rotary kiln.

Magnesia spinel brick
High alumina with SiC/Silica-mullite brick

Burning zone

Burning zone operating temperature max approx. to be 1650℃， with intense chemical reaction in this area. In this strict condition, lining bricks should be with multiple characters of anti-erosion, environment protection without chromium. Magnesia spinel brick is applied by globle market but with poor performance on hanging kiln skin. Magnesia-Fe spinel brick is a better choice, but costly.

Magnesia spinel brick
Magnesia-Fe spinel brick

Outlet zone

Outlet zone lining is quite unstable, temperature is easily up and down due to operating necessaries, thus lining bricks have to be with good thermal shock resistance, also lower thermal conductivity, and wear resistance characters. In the global market, Magnesia spinel brick is widely used in cement kiln linings, but Magnesia brick is with higher thermal conductivity compared with China high alumina with SiC. Today silica-mullite brick is the best option for large scale cement rotary kiln. And thermal shock resistant castable are widely used for the outlet zone.