Corundum Mullite Bricks

Corundum mullite bricks are made of synthetic fused or sintered mullite, pressed by selected shaping processes, and fired in high-temperature furnaces. Corundum mullite bricks offer high density, low porosity, good hot strength, and good slag resistance.

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Introduction of Corundum Mullite Bricks

Corundum mullite bricks are made of synthetic fused or sintered mullite, pressed by selected shaping processes and fired in high-temperature furnaces. Corundum mullite bricks offer high density, low porosity, good hot strength, and good slag resistance. Corundum mullite bricks are preferred for high temperature, high load applications, such as at the hot end of regenerative chambers of glass melters, the superstructure of the furnace, and the arch of glass fiber melters, due to their excellent thermal properties, excellent strength at high temperature, outstanding resistance to thermal shock, etc.

Corundum mullite bricks are composed of white alumina and high-purity mullite as raw materials, add proper metal fines, and are processed by molding under high pressure and sintering under high temperature (1650℃~1750℃). It is a high quality furnace refractory brick, Sijihuo can provide you with corundum mullite bricks with customized drawings.

Corundum mullite bricks are one high alumina refractory product composed of corundum and mullite main crystal phases. Corundum mullite bricks are refractory products made of high-purity or purer raw materials. Low melting point oxide impurities reduce its high-temperature performance. Pure mullite raw materials are synthesized from industrial alumina powder and pure clay, bauxite, or silica. The product prepared by using mullite granules as aggregate has good thermal shock resistance, and the corundum sand as the aggregate product has good corrosion resistance.

Producing Procedure of Corundum Mullite Bricks

The raw materials of the corundum-mullite composite brick are composed of a corundum-mullite homogenized material, white corundum, andalusite, a-Al2O3 powder, and binding clay, as well as paper pulp liquid waste. The preparation method comprises the steps of firstly, preparing raw materials with various particle sizes according to the ratio; then, using raw materials with particle sizes of 1-3mm and particle sizes smaller than 1mm as aggregate to perform dry mixing, adding a paper pulp liquid waste mixture, finally adding the residual raw materials, and milling to obtain a pug; sequentially performing material trapping, press forming and drying on the obtained pug, and finally roasting to obtain a product. The corundum-mullite composite brick produced has very low porosity, high compression strength, and excellent thermal shock and corrosion resistance, can completely satisfy the harsh application environment of the COREX furnace, and can prolong the service life.

Features of Corundum Mullite Bricks

1. High-temperature resistance.

2. High strength, high compression resistance.

3. Excellent thermal shock resistance.

4. High bulk density, and good thermal conductivity.

5. Good wear resistance and acid-alkali corrosion resistance.

Advantages of Corundum Mullite Bricks

1. Fine Thermal Conductivity.

2. Good Abrasion Resistant Ability.

3. High-Temperature Endurance Can Make Direct Contact With Flame.

4. High Compressive Strength, And Good Cold Crushing Resistance Ability.

5. Good Chemical Stability Which Can Endure Corrosive Gas Attacks.

Corundum Mullite Bricks Application

1. Corundum mullite bricks suit large and medium-sized blast furnace bottoms.

2. Corundum mullite bricks are suitable for hearth ceramic masonry and wind, iron, and slag joint masonry.

3. Corundum mullite bricks are suitable for glass furnace superstructure bricks, material bricks, cover plates, and molded parts.

4. Corundum mullite bricks are suitable for medium-temperature carbon black reactor lining and other thermal equipment linings.

Chemical & Physical Index

Item	Mullite Bricks	Re-Sintered Fused Mullite Brick	Mullite Corundum Brick	Corundum – Mullite Brick
Index	Mullite Bricks	Re-Sintered Fused Mullite Brick	Mullite Corundum Brick	Corundum – Mullite Brick
Al₂o₃%	≥70	≥75	≥80	≥90
Sio₂%	≤25	≤23	≤18	≤8
Fe₂o₃%	≤0.5	≤0.5	≤0.5	≤0.3
Apparent Porosity%	≤17	≤14	≤19	≤18
Bulk Density/Cm	≥2.55	≥2.65	≥2.70	≥2.90
Compressive Strength MPa	≥90	≥100	≥80	≥100
RUL	≥1630	≥1700	≥1650	≥1700