high alumina bricks specification
2024-09-14 08:57:34
High alumina brick is a refractory material commonly used in high-temperature industrial furnaces. It is widely used for its excellent high temperature resistance and chemical corrosion resistance. The following are detailed specifications of high alumina bricks:
1. Material composition
High alumina bricks are mainly made of bauxite or other high-alumina raw materials through high-temperature firing. Its main component is alumina (Al2O3), and the content is usually between 48% and 90%. According to the aluminum content, high alumina bricks can be divided into different grades, such as high alumina bricks, ultra-high alumina bricks, etc.
2. Main performance indicators
Refractory: The refractoriness of high alumina bricks is usually between 1550°C and 1750°C, depending on its aluminum content. The refractoriness of high alumina bricks is an important indicator to measure its high temperature resistance.
Load softening point: The load softening point of high alumina bricks is generally between 1500°C and 1650°C. This indicator indicates the stability and load-bearing capacity of the brick body under high temperature conditions.
Flexural strength: The flexural strength of high alumina bricks at room temperature is generally 20-30 MPa. Under high temperature conditions, its flexural strength may decrease, but it still has good structural stability.
Bulk density: The bulk density of high alumina bricks is usually between 2.5 g/cm³ and 3.0 g/cm³. Bulk density affects the refractoriness and thermal stability of the brick body.
Thermal conductivity: The thermal conductivity of high alumina bricks is usually between 1.5 W/(m·K) and 2.5 W/(m·K), depending on its density and aluminum content. Low thermal conductivity can help reduce heat conduction loss and improve the thermal efficiency of the kiln.
3. Physical and chemical properties
Chemical stability: High alumina bricks have good chemical stability and have strong resistance to most acidic substances (such as sulfuric acid, hydrochloric acid) and alkaline substances (such as sodium hydroxide).
Antioxidation: Since the main component of high alumina bricks is alumina, they have strong resistance to oxidation reactions and are suitable for use in oxidizing atmospheres.
Corrosion resistance: High alumina bricks have strong corrosion resistance to molten metal and slag, and can maintain their physical properties and structural stability in high temperature environments.
4. Specifications and models
High alumina bricks have a variety of specifications and models to meet different application requirements. Common specifications include:
Standard brick specifications: 200mm x 100mm x 65mm (length x width x height), and other sizes such as 230mm x 114mm x 76mm, etc.
Special brick specifications: Customized high alumina bricks can be produced according to specific application needs.
5. Application areas
High alumina bricks are widely used in the following fields:
Steel smelting: used for linings of blast furnaces, converters, heating furnaces and other equipment.
Cement industry: used for linings of cement rotary kilns.
Glass industry: used for glass melting furnaces, annealing furnaces, etc.
Ceramic industry: used for ceramic firing furnaces, kilns, etc.
Other high-temperature equipment: such as petrochemical equipment, waste incinerators, etc.
6. Precautions for installation and use
Installation: The installation of high-alumina bricks should pay attention to the treatment of brick joints and the arrangement of brick bodies to ensure the thermal efficiency and durability of the kiln.
Maintenance: Regularly check the wear of the brick body, replace damaged bricks in time, and keep the equipment running normally.
Storage: High-alumina bricks should be stored in a dry and ventilated environment to avoid moisture and pollution to maintain their stable performance.
The above are the basic specifications and instructions for use of high-alumina bricks. Depending on the actual application, the specific technical requirements may vary, so when selecting and using high-alumina bricks, it is recommended to refer to the technical data sheet of the specific product.
1. Material composition
High alumina bricks are mainly made of bauxite or other high-alumina raw materials through high-temperature firing. Its main component is alumina (Al2O3), and the content is usually between 48% and 90%. According to the aluminum content, high alumina bricks can be divided into different grades, such as high alumina bricks, ultra-high alumina bricks, etc.
2. Main performance indicators
Refractory: The refractoriness of high alumina bricks is usually between 1550°C and 1750°C, depending on its aluminum content. The refractoriness of high alumina bricks is an important indicator to measure its high temperature resistance.
Load softening point: The load softening point of high alumina bricks is generally between 1500°C and 1650°C. This indicator indicates the stability and load-bearing capacity of the brick body under high temperature conditions.
Flexural strength: The flexural strength of high alumina bricks at room temperature is generally 20-30 MPa. Under high temperature conditions, its flexural strength may decrease, but it still has good structural stability.
Bulk density: The bulk density of high alumina bricks is usually between 2.5 g/cm³ and 3.0 g/cm³. Bulk density affects the refractoriness and thermal stability of the brick body.
Thermal conductivity: The thermal conductivity of high alumina bricks is usually between 1.5 W/(m·K) and 2.5 W/(m·K), depending on its density and aluminum content. Low thermal conductivity can help reduce heat conduction loss and improve the thermal efficiency of the kiln.
3. Physical and chemical properties
Chemical stability: High alumina bricks have good chemical stability and have strong resistance to most acidic substances (such as sulfuric acid, hydrochloric acid) and alkaline substances (such as sodium hydroxide).
Antioxidation: Since the main component of high alumina bricks is alumina, they have strong resistance to oxidation reactions and are suitable for use in oxidizing atmospheres.
Corrosion resistance: High alumina bricks have strong corrosion resistance to molten metal and slag, and can maintain their physical properties and structural stability in high temperature environments.
4. Specifications and models
High alumina bricks have a variety of specifications and models to meet different application requirements. Common specifications include:
Standard brick specifications: 200mm x 100mm x 65mm (length x width x height), and other sizes such as 230mm x 114mm x 76mm, etc.
Special brick specifications: Customized high alumina bricks can be produced according to specific application needs.
5. Application areas
High alumina bricks are widely used in the following fields:
Steel smelting: used for linings of blast furnaces, converters, heating furnaces and other equipment.
Cement industry: used for linings of cement rotary kilns.
Glass industry: used for glass melting furnaces, annealing furnaces, etc.
Ceramic industry: used for ceramic firing furnaces, kilns, etc.
Other high-temperature equipment: such as petrochemical equipment, waste incinerators, etc.
6. Precautions for installation and use
Installation: The installation of high-alumina bricks should pay attention to the treatment of brick joints and the arrangement of brick bodies to ensure the thermal efficiency and durability of the kiln.
Maintenance: Regularly check the wear of the brick body, replace damaged bricks in time, and keep the equipment running normally.
Storage: High-alumina bricks should be stored in a dry and ventilated environment to avoid moisture and pollution to maintain their stable performance.
The above are the basic specifications and instructions for use of high-alumina bricks. Depending on the actual application, the specific technical requirements may vary, so when selecting and using high-alumina bricks, it is recommended to refer to the technical data sheet of the specific product.