Alumina hollow ball bricks, its main material is alumina hollow ball and alumina powder, combined with other bonding agent, alumina cenosphere brick belongs to one of the hyperthermal saving and insulating material.
Alumina Hollow Bricks Description
Alumina hollow ball brick is a kind of new high temperature insulating material,it is produced with smelted and blown alumina in electric furnace, the crystal form is a-Al2O3 microcrystal. Take the alumina hollow sphere as the main body, and it can be made into various shapes. The highest use temperature is 1800 degrees, and the product has high mechanical strength. It is several times of the light weight products, and the volume density is only 1/2 of the corundum products.
Advantages of Alumina Hollow Bricks
- High operating Temperature:
It can reach to above 1750 degree, good heat stability. the change rate of refiring line is small and longer using time.
- Optimize the structure and reduce the weight of the furnace body.
Nowadays, high temperature resistant materials are all of heavy bricks. The bulk density is 2.6-3.0g/cm, while the alumina hollow brick is only 1.1~1.5g/cm, under the condition of the same cubic meter volume. The alumina hollow ball bricks can reduce the weight of 1.1-1.9 tons.
- Materials Saving
To achieve the same use temperature, if using the heavy bricks, the price is equal to that of alumina hollow brick, and considerable insulation material is needed. If alumina hollow ball bricks are used, 1.1-1.9 tons heavy bricks per cubic meter can be saved, and 80% of fire-resistant insulating materials can be saved.
- Energy Saving
Alumina hollow spheres have obvious thermal insulation characteristics and low thermal conductivity. They can play a good insulation effect, reduce heat emission and improve thermal efficiency, thereby realize the purpose of saving energy. The energy saving effect is more than 30%.
Alumina hollow balls and its products are light refractories with high temperature resistance and excellent energy saving, which are very stable in various atmospheres. Especially in the high temperature kiln at 1800 centigrade. Hollow ball can be used for high temperature, super high temperature heat-insulation filler, high temperature refractory concrete lightweight aggregate, high temperature castable and so on. Hollow ball bricks can be used in high temperature and energy saving (>30%) down draft kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace and so on. For the reduce the weight of the furnace body, reconstruct the structure, save the material and save energy, all of them will have obvious effect.
Alpha alumina powder is made of high quality industrial alumina as raw material, and adopts new high temperature down flame kiln and scientific calcination process. With manual selection, clear classification, less impurity, high conversion rate, stable shrinkage and good consistency.
Alumina Hollow Bricks Production Process
- Burdening
- Molding
- Body Drying
- Firing
- Finished Products
Physical and Chemical Index
| Item | RS-84 | RS-90 | RS-1.2 | RS-1.5 | RS-1.7 |
| Al2O3%≥ | 84 | 90 | 98.5 | 98.5 | 98.5 |
| Fe203%≤ | 0.8 | 0.5 | 0.3 | 0.3 | 0.3 |
| SiO2%≤ | 15 | 9 | 1.0 | 1.0 | 1.0 |
| Bulk density,g/cm3≤ | 1.5 | 1.5 | 1.2 | 1.5 | 1.7 |
| Porosity,% ≥ | 58 | 60 | 62 | 60 | 58 |
| CCS Mpa, ≥ | 16 | 15 | 3 | 12 | 15 |
| Thermal conductivity,1000℃≤ | 1.2 | 1.15 | 0.95 | 1.05 | 1.15 |
| 0.1Mpa RUL, ℃ ≥ | 1650 | 1700 | 1700 | 1700 | 1700 |
| Refractoriness≥ | 1800 | 1800 | 1800 | 1800 | 1800 |
