High Alumina Bricks
High alumina bricks are high-quality refractory materials with alumina content typically between 48% and 90%. These refractory bricks can withstand high-temperature environments of different industrial sectors. Kerui Refractory can provide you with the high aluminum bricks you want!
- Al2O3% (≥) :48-80
- Cold Crushing Strength (MPa) :40-60
- Refractoriness Underload (℃) :1420-1530
- Apparent Porosity (%) :19 – 26
What Are High Alumina Bricks?
Kerui Refractory high alumina bricks are a type of refractory brick, which primarily consist of alumina (Al2O3). Because of the high alumina content in these fire bricks, they can enhance thermal insulation, improve resistance to thermal shock, and increase fire refractoriness. Meanwhile, these refractory bricks effectively protect the structural integrity of industrial equipment by avoiding heat loss and resisting chemical corrosion.
Types of High Alumina Refractory Bricks
| Item/Grade | LZ-80 | LZ-75 | LZ-70 | LZ-65 | LZ-55 | LZ-48 | LZ-75G | LZ-65G | LZ-55G | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ω (Al2O3)/% | μ0 ≥ | 80 | 75 | 70 | 65 | 55 | 48 | 75 | 65 | 55 | |
| σ | 1.5 | ||||||||||
| Apparent Porosity/% | μ0 ≤ | 21 (23) | 24 (26) | 24 (26) | 24 (26) | 22 (24) | 22 (24) | 19 | 19 | 19 | |
| σ | 1.5 | ||||||||||
| Cold Crushing Strength/MPa | μ0 ≥ | 70 (60) | 60 (50) | 55 (45) | 50 (40) | 45 (40) | 40 (35) | 65 | 60 | 50 | |
| Xmin | 60 (50) | 50 (40) | 45 (35) | 40 (30) | 35 (30) | 30 (35) | 55 | 50 | 40 | ||
| σ | 15 | ||||||||||
| 0.2MPa Refractoriness Underload/℃ | μ0 ≥ | 1530 | 1520 | 1510 | 1500 | 1450 | 1420 | 1520 | 1500 | 1470 | |
| σ | 13 | ||||||||||
| Permanent Linear Change/% | Xmin Xmax | 1500℃*2h -0.4~0.2 | 1450℃*2h -0.4~0.1 | 1500℃*2h -0.2~0.1 | 1450℃*2h -0.2~0 | ||||||
SK36 fire bricks manufactured by KERUI have an alumina content of around 55-65%. These refractory bricks offer good thermal stability and high mechanical strength, which have wide applications in the lower temperature zones of industrial furnaces, such as hot blast stoves and blast furnaces.
Refractory company SK37 bricks are a type of refractory brick with an alumina content of approximately 65-70%. They are suitable for use in moderate temperature applications. SK37 high alumina refractory bricks are commonly suitable in various industrial furnaces, such as reheat furnaces, and heating furnaces.
SK38 bricks have a higher alumina content of 70-82%. They show superior thermal shock resistance and can withstand higher temperatures compared to SK36 bricks. SK38 high alumina bricks are suitable for applications in areas of high thermal stress, such as steel ladles, cement rotary kilns, and electric arc furnaces.
SK40 bricks have an alumina content of approximately 82-90%, which have excellent wear resistance and chemical resistance. These bricks have a wide range of applications in the hottest areas of industrial furnaces, such as the burning zone of cement rotary kilns and the transition zone of lime kilns.
Composition of High Alumina Fire Bricks
The main raw material used for high alumina fire brick is Bauxite, which is a natural mineral rich in alumina. At the same time, other materials and additives may be included to enhance specific properties of high alumina fire bricks. The general raw material composition of these refractory bricks for sale includes:
Bauxite is the main raw material and source of alumina in high alumina refractory bricks, which typically contains a high percentage of Al2O3 and different amounts of impurities such as SiO2, Fe2O3, and TiO2.
Certain types of clay, such as kaolin clay or fire clay, may be added to the raw material composition of high alumina bricks. Clay helps to plasticize the mixture and improves the processability of the raw material mixture.
As the raw material mixture, sometimes silica (SiO2) can improve the properties of refractory bricks, which can enhance thermal shock resistance and reduce thermal expansion of high alumina bricks.
Binders and the exact chemical composition of high alumina refractory bricks can vary based on the manufacturing process and detailed performance requirements of the high alumina bricks. Therefore, careful control of the chemical composition of the fire bricks is crucial to ensure refractory properties, thermal stability, and wear resistance in high-temperature applications.
This refractory brick has more alumina content and better slag resistance, which is suitable for molten metal or other corrosive materials.
These bricks have low thermal conductivity, which helps to minimize heat transfer and improve the overall thermal efficiency of industrial processes.
High Al2O3 content leads to high load-softening temperature. As such, they withstand high temperatures while maintaining structural integrity.
These bricks have a long service life due to their ability to withstand high temperatures. Meanwhile, it reduces the need for frequent maintenance.
These fire bricks have excellent thermal stability. They can maintain mechanical strength even when subjected to rapid temperature changes.
The fire resistance of these bricks is higher than silica bricks. The refractoriness of alumina fire bricks is from 1750°C (3182°F ) to 1790°C (3254 °F).
Advanced Manufacturing Process of Kerui High Alumina Bricks
After the equipment sends raw materials into the workshop, they are put into storage after screening and testing. Then the materials are dosed by the fully automated batching system to ensure that the product performs as expected.
Kerui Refractory is equipped with the CNC press and hydraulic press. In addition, the links required for refractory brick forming: pressing, extruding or casting forming, are operated by the machine, with high precision of forming.
Kerui Refractory has two 160m high-temperature natural gas tunnel kilns, which fire the bricks. This process is crucial as it converts the raw materials into a dense, solid structure. Meanwhile, high alumina bricks are fired at high temperatures.
Once the firing process is complete, the refractory bricks are gradually cooled down to room temperature. They are then inspected for quality, and dimensional accuracy. Fire bricks that pass the inspection are ready for packaging and shipping.
Wide Applications of High Alumina Brick
Fair Price of Kerui Refractories
Generally, refractory bricks have a higher price than clay fire bricks due to their superior refractory properties. But as a refractory brick manufacturer in China, Kerui Refractory will offer you cheap fire bricks. For accurate and up-to-date pricing information, Contact us now!
Kerui is a manufacturer with more than 20 years of experience in producing high-alumina brick. We have professional technicians who can provide professional project guidance. If you are looking for high alumina brick, you will choose KERUI.