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Introduction
Corundum Mullite bricks are produced by sintering of high purity fused corundum, synthetic mullite and chromium oxide, i.e. pure alumina and mullite materials are the main raw materials, then adding proper metal fines, processed by moulding under high pressure and sintering under high temperature (1650℃~1750℃). Corundum-Mullite Brick is a high quality furnace refractory brick, Xinhongji Refractory can provide you corundum mullite brick with customized sizes.
Corundum mullite bricks have good high temperature strength, high temperature creep resistance, thermal shock resistance and erosion resistance. The physical and chemical properties of a typical corundum - mullite brick are as follows: Al2O3>85%, Fe2O3≤0.45%, apparent porosity is about 19%, room temperature compressive strength greater than 55MPa, load softening temperature greater than 1700℃, heating line change (1600℃, 3h)-0.1%, thermal shock resistance (1100℃ water cooling) more than 30 times.
Features:
1. ab. 85% Al2O3 and not more than 0.45% Fe2O3
2. High temperature resistance
3. High strength,high compression resistance,
4. Excellent thermal shock resistance,
5. High bulk density, good thermal conductivity,
6. Good wear resistance and acid alkali corrosion resistance
Technical Parameters of Corundum Mullite Bricks:
Item |
Mullite Bricks |
Mullite Corundum Brick |
Corundum Mullite Brick |
Corundum Mullite Brick |
Corundum Brick |
|
Index |
Unit |
|||||
Chemical Composition |
Al2O3% |
≥75 |
≥80 |
≥85 |
≥88 |
≥92 |
SiO2% |
≤23 |
≤18 |
≤12 |
≤8 |
≤3.1 |
|
Fe2O3% |
≤1.0 |
≤0.5 |
≤0.4 |
≤0.3 |
≤0.1 |
|
Apparent Porosity |
% |
≤21 |
≤20 |
≤19 |
≤18 |
≤18 |
Bulk Density |
g/cm3 |
≥2.65 |
≥2.70 |
≥2.75 |
≥2.85 |
≥3.00 |
Compressive Strength |
Mpa |
≥80 |
≥80 |
≥90 |
≥100 |
≥100 |
Refractoriness Under Load (RUL) |
℃, 0.2Mpa, 0.6%) |
≥1600 |
≥1650 |
≥1700 |
≥1700 |
≥1750 |
Application |
Primarily used for the key parts of the industrial furnace of steel, electronics, petrochemical, fertilizers, non-ferrous metals, refractory material, etc |
|||||
Advantages:
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 Attack.
Corundum Mullite Bricks Application
1.Corundum mullite bricks suitable for large and medium sized blast furnace bottom.
2.Corundum mullite bricks suitable for hearth ceramic masonry and wind, iron, slag joint masonry.
3.Corundum mullite bricks suitable for glass furnace superstructure brick, material brick, cover plate, molded parts.
4.Corundum mullite bricks suitable for medium temperature carbon black reactor lining and other Thermal equipment lining.
Producing Procedure:
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 resistance and corrosion resistance, can completely satisfy the harsh application environment of the COREX furnace, and can prolong the service life.
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