Alkali resistant bricks use silica, coke stones and appropriate additives to improve the microstructure of this kind of brick. During the usage, it reacts with the basic oxide to form a high-viscosity glass phase, which covers the surface of the brick to block the surface pores on the bricks, prevents the infiltration of the alkaline slag, and prevent the resisting alkali and resisting corrosion.
On the basis of a common type of high alkali-resistant brick, it is manufactured by adding additives to increase the compressive strength. The product has the features of high strength, stable volume, good alkali corrosion resistance, and it is suitable for cement kiln preheater, decomposition furnace, tertiary air duct and so on.
Technical Parameter of Alkali Resistance Bricks:
| Item | Alkali Resistance Brick | ||
| Chemical composition(%) | |||
| Al2O3 | 25-40 | 25-40 | 25-40 |
| Fe2O3 | ≤2 | ≤2 | ≤2 |
| Bulk Density（g/cm3） | 2.1 | 2.2 | 2.2 |
| Apparent Porosity（%） | ≤21 | ≤19 | ≤20 |
| Cold Crushing Strength（Mpa） | ≥30 | ≥60 | ≥40 |
| Load Softening Temperature（℃）To.6 | ＞1300 | ＞1250 | ≥1350 |
| Thermal Conductivity（w/m.k） | ＜1.2 | ＜1.2 | |
