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High-Alumina Lightweight Insulation Brick
Main Types of Lightweight Insulating and Refractory Bricks Lightweight insulating and refractory bricks can be divided into five major categories based on their material composition and operating temperature: Lightweight Clay Bricks: Made primarily from clay, these bricks contain 30%–48% Al₂O₃, with a bulk density ranging from 0.3 to 1.5 g/cm³. They are suitable for use at temperatures between 900°C and 1400°C, boasting a thermal conductivity of 0.15–0.35 W/m·K. These bricks are ideal for the insulation layers of most industrial kilns. Lightweight Silica Bricks: With SiO₂ content ≥91%, these bricks have a bulk density of 0.8–1.2 g/cm³ and exhibit excellent acid resistance. They are commonly used in glass furnace arches and hot blast stoves, featuring a thermal conductivity of 0.2–0.4 W/m·K. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and boasting a bulk density of 0.8–1.5 g/cm³, these bricks offer exceptional high-temperature performance (up to 1450°C) and a thermal conductivity of 0.18–0.3 W/m·K. They are employed for thermal insulation in high‑temperature zones within industries such as metallurgy and ceramics. Aluminum Oxide Hollow Sphere Bricks: With Al₂O₃ content ≥90% and a bulk density of 1.0–1.8 g/cm³, these bricks exhibit a fire resistance of up to 1800°C and a thermal conductivity of 0.08–0.15 W/m·K. They are well suited for specialized applications in aerospace, nuclear power, and other critical environments. Lightweight Mullite Bricks: Comprising 60%–75% Al₂O₃ and boasting a bulk density of 0.6–1.0 g/cm³, these bricks can withstand direct exposure to flames (1200–1700°C). They are commonly used in cracking furnaces and ceramic roller hearth kilns. Production Processes The core production process for lightweight bricks involves reducing density through a porous structure. The primary methods include: Burnout Additive Method: Combustible materials such as wood chips or carbon powder are added to the raw clay body; after firing, these materials burn away, leaving behind air pores. Foam Method: Foaming agents like rosin soap are incorporated into the mix, followed by mechanical foaming before shaping and firing. Chemical Method: By reacting dolomite with sulfuric acid, gases such as CO₂ are generated to create porosity. Hollow Sphere Method: Aluminum oxide or mullite hollow spheres serve as aggregate, which is directly pressed and sintered. For ultra‑lightweight bricks (density <0.4 g/cm³), fly ash—typically a byproduct of coal combustion—is often used as a lightweight aggregate. Application Scenarios Industrial Kilns: Used as insulation layers or backings in hot blast stoves, soaking furnaces, and cracking furnaces, these bricks reduce heat loss by 24%–45%. Chemical and Metallurgical Industries: Employed as linings for petrochemical heaters and blast furnaces—resistant to high temperatures yet not directly exposed to molten slag. Building Materials Industry: Served as thermal insulation layers in cement kilns and glass furnaces, helping to reduce kiln weight. Specialized Fields: Aluminum oxide hollow sphere bricks are utilized in nuclear power plants; perlite bricks (with a density of 0.26–0.3 g/cm³) are used for fire‑resistant partition walls in construction. Performance Advantages Energy‑Efficient and Highly Effective: With low thermal conductivity (0.07–0.6 W/m·K), these bricks minimize heat loss from the furnace, resulting in fuel savings of 20%–60%. Lightweight: Their density is only 1/4 to 1/3 that of conventional heavy bricks, simplifying kiln design and construction. Rapid Heating and Cooling: Featuring low thermal mass, they are particularly well suited for intermittent kilns. Environmentally Friendly and Safe: Free from asbestos and formaldehyde (as seen in perlite bricks), these products meet Class A1 fire‑resistance standards. Physical and Chemical Specifications Typical Range | Test Standard ——————————————————————— Bulk Density: 0.4–1.5 g/cm³ (Lightweight Bricks) | GB/T 2997–2000 Compressive Strength: 0.2–8.1 MPa | GB/T 5072–2008 Thermal Conductivity (at 350°C): 0.07–0.6 W/(m·K) | GB/T 10294–2008 Operating Temperature: 600–1800°C (depending on type) | GB/T 3994–2005 Thermal Shock Resistance: 25 cycles (water quench at 1100°C) | GB/T 30873–2014 Note: Aluminum oxide hollow sphere bricks and mullite bricks deliver the best high‑temperature performance but come at a higher cost; clay bricks offer the greatest economic benefits, though their temperature resistance is relatively lower.
Main Types of Lightweight Insulating and Refractory Bricks Lightweight insulating and refractory bricks can be divided into five major categories based on their material composition and operating temperature: Lightweight Clay Bricks: Made primarily from clay, these bricks contain 30%–48% Al₂O₃, with a bulk density ranging from 0.3 to 1.5 g/cm³. They operate at temperatures between 900°C and 1,400°C, exhibiting a thermal conductivity of 0.15–0.35 W/m·K. These bricks are suitable for use as insulation layers in most industrial kilns. Lightweight Silica Bricks: With SiO₂ content ≥91%, these bricks have a bulk density of 0.8–1.2 g/cm³ and exhibit excellent acid resistance. They are commonly used in the arches of glass furnaces and in hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and featuring a bulk density of 0.8–1.5 g/cm³, these bricks offer exceptional high-temperature performance (up to 1,450°C) and a thermal conductivity of 0.18–0.3 W/m·K. They are employed for thermal insulation in high‑temperature zones within industries such as metallurgy and ceramics. Aluminum Oxide Hollow Sphere Bricks: With Al₂O₃ content ≥90%, these bricks have a bulk density of 1.0–1.8 g/cm³ and can withstand firing temperatures as high as 1,800°C. Their thermal conductivity ranges from 0.08 to 0.15 W/m·K, making them ideal for specialized applications such as aerospace and nuclear power. Lightweight Mullite Bricks: Comprising 60%–75% Al₂O₃ and boasting a bulk density of 0.6–1.0 g/cm³, these bricks can be directly exposed to flames (1,200–1,700°C). They are commonly used in cracking furnaces and ceramic roller hearth kilns. Production Processes The core production process for lightweight bricks involves reducing density through a porous structure. The primary methods include: Burnout Additive Method: Combustible materials such as wood chips or carbon powder are added to the raw clay mixture; after firing, these materials burn away, leaving behind air pores. Foam Method: Foaming agents like rosin soap are incorporated into the mix, followed by mechanical foaming before shaping and firing. Chemical Method: A chemical reaction is utilized—such as the reaction between dolomite and sulfuric acid—which generates gases like CO₂ to create porosity. Hollow Sphere Method: Hollow alumina/mullite spheres serve as aggregate, which is then directly pressed and sintered. For ultra‑lightweight bricks (with densities below 0.4 g/cm³), fly ash-derived cenospheres are often used as lightweight aggregates. Application Scenarios Industrial Kilns: Used as insulation layers or backings in hot blast stoves, soaking furnaces, and cracking furnaces, these bricks reduce heat loss by 24%–45%. Chemical and Metallurgical Industries: Employed as linings for petrochemical heaters and blast furnaces—resistant to high temperatures yet not directly exposed to molten slag. Building Materials Industry: Served as thermal insulation layers in cement kilns and glass furnaces, helping to reduce kiln weight. Specialized Fields: Aluminum oxide hollow sphere bricks are used in nuclear power plants; perlite bricks (with densities ranging from 0.26 to 0.3 g/cm³) are utilized for fire‑resistant partition walls in construction. Performance Advantages Energy‑Efficient and Highly Effective: With low thermal conductivity (0.07–0.6 W/m·K), these bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: With densities only 1/4 to 1/3 that of traditional heavy bricks, they simplify kiln designs and structures. Rapid Heating and Cooling: Due to their small heat capacity, they are well suited for intermittent kilns. Environmentally Friendly and Safe: Free from asbestos and formaldehyde (as seen in perlite bricks), these bricks meet Class A1 fire‑resistance standards. Physical and Chemical Specifications Typical Range | Test Standard ——————————————————————— Bulk Density: 0.4–1.5 g/cm³ (Lightweight Bricks) | GB/T 2997–2000 Compressive Strength: 0.2–8.1 MPa | GB/T 5072–2008 Thermal Conductivity (at 350°C): 0.07–0.6 W/(m·K) | GB/T 10294–2008 Operating Temperature: 600–1,800°C (depending on type) | GB/T 3994–2005 Thermal Shock Resistance: 25 cycles (water quench at 1,100°C) | GB/T 30873–2014 Note: Aluminum oxide hollow sphere bricks and mullite bricks deliver the best high‑temperature performance but come at a higher cost; clay bricks offer the greatest economic benefits, though their temperature resistance is relatively lower.
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