Special High Alumina Introduction
Special high alumina brick with aluminum content >80%, bulk density of 2.6, high refractoriness, high load softening temperature, good thermal shock resistance, acid resistance, alkali resistance, peeling resistance, corrosion resistance, low temperature creep rate, high temperature strength Higher characteristics.
Special high alumina brick is a high alumina refractory brick with a content of more than 80% aluminum oxide. The high alumina bauxite clinker is used as the main raw material, the soft clay and the waste pulp paper liquid are used as the binder, and the multi-stage particles are matched. The formed mud is formed by high pressure molding, drying and high temperature firing. High alumina bricks are classified according to mineral composition: low mullite, mullite, mullite corundum, corundum mullite and corundum. The mineral composition is mainly corundum, mullite and glass.
Special High Alumina Brick Features
a, Refractoriness
Special high alumina bricks have higher refractoriness than clay bricks and semi-silica bricks, reaching 1750~1790℃, which is a high-grade refractory material.
b, Load softening temperature
Because special high alumina brick has high Al2O3, low impurity content and less fusible glass body, the load softening temperature is higher than clay brick, but the mullite crystal does not form a network structure, so the load softening temperature is still not high.
c, Slag resistance
High alumina bricks contain more Al2O3, close to neutral refractory materials, and can resist the erosion of acid slag and alkaline slag. Because of the SiO2 content, the ability to resist alkaline slag is weaker than that of acid slag.
Special High Alumina Brick Spec
Item
Brand |
Low Creep Clay Fire brick |
Low porosity clay brick |
Special high alumina brick |
Chemical Composition |
Al2o3(%) |
42~53 |
>42 |
>58 |
| Fe2o3(%) |
1.6 |
2.0 |
1.5 |
| Cao+Mgo(%) |
0.7 |
0.7 |
0.7 |
| Na2o+k2O(%) |
0.8 |
0.8 |
0.8 |
| Bulk Density g/cm3 |
2.2 |
2.2 |
2.45 |
| Apparent Porosity |
17 |
17 |
16 |
| Cold Crushing Strength |
40 |
40 |
50 |
0.2MPa Refractoriness
Under Load |
1450 |
1450 |
1600 |
| High temperature creep%（1280℃，0.2mpa，25h）CS |
0.4 |
- |
0.4 |
| High temperature flexural strength |
1200℃ |
10 |
- |
- |
| 1350℃ |
4 |
- |
6 |
| Thermal expansion rate （20℃-100℃）< |
0.7 |
0.7 |
0.7 |
Special High Alumina Brick Application
Special high alumina brick mainly used for building ceramic frit kiln, soda kiln, glass kiln, blast furnace.
Hot blast stove, electric furnace top, blast furnace, reverberatory furnace, rotary kiln
Lined. In addition, high alumina bricks are also widely used as open hearth regenerative lattice bricks, plugs for sprue systems, nozzle bricks.
