Refractory Bricks

Product characteristics and classification of mullite insulation brick

Feb 24,2022

Mullite insulation brick is a high-alumina refractory material with mullite (3Al2O3·2SiO2) as the main crystal phase. Generally, the alumina content is between 65% and 75%. In addition to mullite, the mineral composition with lower alumina also contains a small amount of glass phase and cristobalite; the one with higher alumina also contains a small amount of corundum. Mullite insulation brick can be directly used for the lining of high-temperature kilns, and have been widely used in shuttle kilns, roller kilns, glass and petrochemical kilns.

mullite insulation bricks 

Product characteristics of mullite insulation brick

1. Low thermal conductivity and good thermal insulation effect;

2. Mullite insulation bricks have low thermal melting. 

3. Low impurity content has very low iron box alkali metal and other oxide content, therefore, high refractoriness;

4. Mullite insulation bricks have high thermal compressive strength;

5. Accurate appearance and size, speed up the masonry, reduce the amount of refractory mud used, ensure the strength and stability of the masonry, thereby extending the life of the lining;

6. Mullite insulation bricks can be processed into special shapes to reduce the number of bricks and joints. 

The performance of mullite insulation brick

Highrefractoriness, up to 1790 ℃.

The starting temperature of load softening is 1600~1700 ℃.

Compressive strength at room temperature is 70~260 MPa.

Good thermal shock resistance.

 mullite insulation bricks

Classification of mullite insulation brick

According to the density:mullite insulation bricks are mainly divided into light and heavy mullite bricks.

According to the use temperature, they are mainly divided into: 1350 mullite insulation bricks, 1450 mullite insulation bricks, 1550 mullite bricks, etc. .

According to the performance and application,there are two types of sintered mullite bricks and fused mullite bricks. Sintered mullite bricks are made of high-alumina bauxite clinker as the main raw material, adding a small amount of clay or raw bauxite as a binding agent, and forming and firing. Fused mullite bricks are made of high alumina, industrial alumina and refractory clay as raw materials, and charcoal or coke fine particles are added as reducing agents. After molding, they are manufactured by reducing electric melting. The crystallization of fused mullite is larger than that of sintered mullite, and its thermal shock resistance is better than that of sintered products. Their high temperature performance mainly depends on the content of alumina and the uniformity of mullite phase and glass distribution. Mainly used for hot blast stove top, blast furnace body and bottom, regenerator of glass melting furnace, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.


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