How to choose the right high alumina brick according to temperature
2025-03-21 17:16:20
Temperature is a crucial factor when choosing high alumina bricks. High alumina bricks are a kind of refractory materials with high refractoriness, thermal shock resistance, corrosion resistance and excellent thermal stability, which are widely used in metallurgy, chemical industry, building materials and other industries. Choosing the right high alumina brick according to the temperature of the use environment can maximize its performance and service life. Here are a few key steps on how to choose the right high alumina brick according to temperature:
1. Understand the refractoriness of high alumina bricks
The refractoriness of high alumina bricks is usually determined by their aluminum content and firing process. The refractoriness of high alumina bricks is generally between 1550°C and 1800°C, or even higher. When choosing, first clarify the working temperature of the place of use to ensure that the selected high alumina bricks can withstand this temperature range. For high temperature environments, high alumina bricks with higher refractoriness should be selected, such as high alumina bricks containing 70% or more bauxite.
2. The influence of temperature fluctuations
The thermal shock resistance of high alumina bricks is closely related to temperature fluctuations. If the working environment temperature fluctuates greatly, such as frequent heating and cooling processes in the furnace, high-alumina bricks with good thermal stability should be selected. This type of brick can withstand the thermal expansion and contraction caused by temperature changes, avoiding cracking or breakage caused by temperature changes.
3. Choose suitable high-alumina bricks according to the working environment
Different industrial environments have different temperature requirements for high-alumina bricks. For example:
In blast furnaces, since the temperature usually reaches above 1600°C, high-alumina bricks with high refractoriness and excellent thermal shock resistance are required.
In cement kilns, the temperature fluctuates greatly, and it is recommended to choose high-alumina bricks with high thermal stability and wear resistance.
For areas such as furnace linings that require long-term stable operation, high-alumina bricks that can withstand high temperatures for a long time without deformation or damage should be selected.
4. Consider the aluminum content of high-alumina bricks
The aluminum content of high-alumina bricks is directly related to their refractory temperature. Under normal circumstances:
High-alumina bricks with a low aluminum content (60%-70%) are suitable for use in the medium temperature range (1000°C-1500°C).
High alumina bricks with a higher aluminum content (more than 70%) are more suitable for use in high temperature (more than 1500°C) environments.
5. Selection in special environments
In special environments, such as places containing strong acids, strong alkalis or corrosive gases, the corrosion resistance of high alumina bricks must also be considered. In this case, choosing corrosion-resistant high alumina bricks can extend the service life and maintain good performance even if their refractoriness is low.
Conclusion
Selecting suitable high alumina bricks according to temperature requires comprehensive consideration of factors such as the working temperature, temperature fluctuation, aluminum content, and thermal stability of the use environment. Only by selecting suitable high alumina bricks can we ensure that they exhibit excellent refractoriness, thermal shock resistance, and corrosion resistance in high temperature environments, thereby improving the operating efficiency and safety of the equipment.
1. Understand the refractoriness of high alumina bricks
The refractoriness of high alumina bricks is usually determined by their aluminum content and firing process. The refractoriness of high alumina bricks is generally between 1550°C and 1800°C, or even higher. When choosing, first clarify the working temperature of the place of use to ensure that the selected high alumina bricks can withstand this temperature range. For high temperature environments, high alumina bricks with higher refractoriness should be selected, such as high alumina bricks containing 70% or more bauxite.
2. The influence of temperature fluctuations
The thermal shock resistance of high alumina bricks is closely related to temperature fluctuations. If the working environment temperature fluctuates greatly, such as frequent heating and cooling processes in the furnace, high-alumina bricks with good thermal stability should be selected. This type of brick can withstand the thermal expansion and contraction caused by temperature changes, avoiding cracking or breakage caused by temperature changes.
3. Choose suitable high-alumina bricks according to the working environment
Different industrial environments have different temperature requirements for high-alumina bricks. For example:
In blast furnaces, since the temperature usually reaches above 1600°C, high-alumina bricks with high refractoriness and excellent thermal shock resistance are required.
In cement kilns, the temperature fluctuates greatly, and it is recommended to choose high-alumina bricks with high thermal stability and wear resistance.
For areas such as furnace linings that require long-term stable operation, high-alumina bricks that can withstand high temperatures for a long time without deformation or damage should be selected.
4. Consider the aluminum content of high-alumina bricks
The aluminum content of high-alumina bricks is directly related to their refractory temperature. Under normal circumstances:
High-alumina bricks with a low aluminum content (60%-70%) are suitable for use in the medium temperature range (1000°C-1500°C).
High alumina bricks with a higher aluminum content (more than 70%) are more suitable for use in high temperature (more than 1500°C) environments.
5. Selection in special environments
In special environments, such as places containing strong acids, strong alkalis or corrosive gases, the corrosion resistance of high alumina bricks must also be considered. In this case, choosing corrosion-resistant high alumina bricks can extend the service life and maintain good performance even if their refractoriness is low.
Conclusion
Selecting suitable high alumina bricks according to temperature requires comprehensive consideration of factors such as the working temperature, temperature fluctuation, aluminum content, and thermal stability of the use environment. Only by selecting suitable high alumina bricks can we ensure that they exhibit excellent refractoriness, thermal shock resistance, and corrosion resistance in high temperature environments, thereby improving the operating efficiency and safety of the equipment.