Jun 30, 2021
High Alumina Insulation Bricks
Lightweight High Alumina Brick Production Process
The usually used production method of lightweight high alumina brick is the foaming method. Ground high alumina clinker, binders(such as chamotte), and foaming agent are proportionally mixed to prepare a slurry, then green lightweight high alumina bricks are produced by casting method, and sintered at 1350~1500℃ high temperature.
Lightweight High Alumina Bricks Characteristics
The bulk density of lightweight high alumina brick is between 0.4~1.35g/cm3, porosity is between 66%~73%.
Crushing strength is between 1.3~8.1Mpa, thermal conductivity is between 0.291~0.582W/(m·K)(350℃).
Lightweight high alumina brick has high refractoriness, good thermal shock resistance, and so on.
Lightweight High Alumina Bricks Physiochemical Indexes
| Item | QLZ-1.0 | QLZ-0.9 | QLZ-0.8 | QLZ-0.7 | QLZ-0.6 | QLZ-0.4 |
| Al2O3 % | ≥48 | |||||
| Fe2O3 % | ≤2.0 | |||||
| Bulk density g/cm3 ≤ | 1.0 | 0.9 | 0.8 | 0.7 | 0.6 | 0.4 |
| Cold crushing strength Mpa ≥ | 3.9 | 3.4 | 2.9 | 2.5 | 2.0 | 0.8 |
| Thermal conductivity W/(m·K)≤ | 0.50 | 0.45 | 0.35 | 0.35 | 0.30 | 0.20 |
Lightweight High Alumina Bricks Applications
Lightweight high alumina bricks are usually used as high-temperature insulating lining of industrial kilns and furnaces. High-quality lightweight high alumina bricks can be directly used in working lining of industrial kilns, where contact with flame directly. But light high alumina brick is not suitable in places where molten slag corrosion exists. As lightweight high alumina bricks have good chemical stability at reduction atmosphere, so light high alumina bricks are usually used as insulating lining of kilns and furnaces which adopt H2 or CO as protection atmosphere. The max working temperature of high alumina brick is about 1350~1500℃, high purity lightweight corundum brick max. working temperature can reach 1650~1800℃.
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