Products
Lightweight Insulating Clay Brick 1.0
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 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 high-temperature resistance up to 1,450°C, with 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, while exhibiting a thermal conductivity of 0.08–0.15 W/m·K. They are ideal 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 be directly exposed to flame temperatures ranging from 1,200°C to 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 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: Gases—such as CO₂—are generated through the reaction between dolomite and sulfuric acid, creating porosity within the brick. 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, reducing 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 densities 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), lightweight bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: With densities only 1/4 to 1/3 those of heavy bricks, these bricks simplify kiln designs. Rapid Heating and Cooling: Due to their small heat capacity, they are well suited for intermittent kilns. Environmentally Friendly and Safe: Free of 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.
Lightweight Insulation Brick Made of Clay 0.8
Main Types of Lightweight Insulating and Refractory Bricks Lightweight insulating and refractory bricks can be classified into five major categories based on their material composition and operating temperature: 1. 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. 2. 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 hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. 3. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and a bulk density of 0.8–1.5 g/cm³, these bricks offer high-temperature resistance up to 1,450°C, with 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. 4. Aluminum Oxide Hollow Sphere Bricks: Featuring 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. 5. 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 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: Gases—such as CO₂—are generated through reactions between dolomite and sulfuric acid, creating porosity within the brick. – Hollow Sphere Method: Hollow alumina/mullite spheres serve as aggregate, which is then directly pressed and sintered. For ultra‑lightweight bricks (density <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, reducing 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 (density 0.26–0.3 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), lightweight bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: With densities only 1/4 to 1/3 those of heavy bricks, they simplify kiln designs and reduce structural loads. Rapid Heating and Cooling: Due to their small heat capacity, lightweight bricks are well suited for intermittent kiln operations. 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 efficiency, though their temperature resistance is relatively lower.
Lightweight Insulating Clay Bricks
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: Light‑weight clay bricks: Made primarily from clay, with an Al₂O₃ content ranging from 30% to 48%, a bulk density of 0.3–1.5 g/cm³, and an operating temperature of 900–1400°C. They feature a thermal conductivity of 0.15–0.35 W/m·K and are suitable for use as insulation layers in most industrial kilns. Light‑weight silica bricks: Containing at least 91% SiO₂, with a bulk density of 0.8–1.2 g/cm³, these bricks exhibit excellent acid resistance and are commonly used in the arches of glass kilns and hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. High‑alumina lightweight bricks: With an Al₂O₃ content of at least 65%, a bulk density of 0.8–1.5 g/cm³, and high‑temperature resistance up to 1450°C, these bricks have a thermal conductivity of 0.18–0.3 W/m·K and are employed for thermal insulation in high‑temperature zones within industries such as metallurgy and ceramics. Alumina hollow‑sphere bricks: Comprising at least 90% Al₂O₃, with a bulk density of 1.0–1.8 g/cm³ and a fire resistance reaching 1800°C, these bricks exhibit a thermal conductivity of 0.08–0.15 W/m·K and are ideal for specialized applications such as aerospace and nuclear power. Lightweight mullite bricks: Featuring an Al₂O₃ content of 60%–75% and a bulk density of 0.6–1.0 g/cm³, these bricks can withstand direct exposure to flames (1200–1700°C) and are used in cracking furnaces, ceramic roller hearth kilns, and similar applications. Production Processes The core production process for lightweight bricks involves reducing density through a porous structure. The primary methods include: Burn‑out 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: Gases—such as CO₂—are generated through the reaction between dolomite and sulfuric acid, creating porosity within the brick. 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 (a byproduct of pulverized 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, reducing 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 kilns, helping to reduce kiln weight. Specialized Fields: Alumina 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), lightweight 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 heavy bricks, they simplify kiln design and construction. Rapid heating and cooling: Due to their small heat capacity, they are well suited for intermittent kilns. Environmentally friendly and safe: Free of 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: 600–1800°C (depending on type) | GB/T 3994–2005 Thermal Shock Resistance: 25 cycles (water quench at 1100°C) | GB/T 30873–2014 Note: Alumina hollow‑sphere bricks and mullite bricks deliver the best high‑temperature performance but come at a higher cost; clay bricks offer the greatest economic efficiency, though their temperature resistance is relatively lower.
Alumina Hollow Sphere Special-Shaped Bricks
Main Types of Lightweight Insulating and Refractory Bricks Lightweight insulating and refractory bricks can be classified into five major categories based on their material composition and operating temperature: 1. 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 1400°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. 2. Lightweight Silica Bricks: With SiO₂ content ≥91%, these bricks have a bulk density of 0.8–1.2 g/cm³ and excellent acid resistance. They are commonly used in the arches of glass furnaces and hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. 3. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and a bulk density of 0.8–1.5 g/cm³, these bricks offer high-temperature resistance up to 1450°C, with 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. 4. Aluminum Oxide Hollow Sphere Bricks: Featuring Al₂O₃ content ≥90%, these bricks have a bulk density of 1.0–1.8 g/cm³ and a fire resistance of up to 1800°C, along with a thermal conductivity of 0.08–0.15 W/m·K. They are ideal for specialized applications such as aerospace and nuclear power. 5. Lightweight Mullite Bricks: With Al₂O₃ content ranging from 60% to 75% and a bulk density of 0.6–1.0 g/cm³, these bricks can withstand direct exposure to flames (1200–1700°C). They are used in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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. – Foaming Method: Foaming agents like rosin soap are incorporated into the mix, followed by mechanical foaming before shaping and firing. – Chemical Method: Gases—such as CO₂—are generated through the reaction between dolomite and sulfuric acid, creating pores within the brick. – Hollow Sphere Method: Hollow alumina/mullite spheres serve as aggregate, which is directly pressed and sintered. For ultra‑lightweight bricks (density <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, reducing heat loss by 24%–45%. Chemical and Metallurgical Industries: Employed as linings for petrochemical heaters and blast furnaces—resistant to high temperatures but 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 (density 0.26–0.3 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), lightweight bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: With densities only 1/4 to 1/3 those of heavy bricks, they simplify kiln designs and reduce structural loads. 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 in the case of 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: 600–1800°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, though they come at a higher cost; clay bricks offer the greatest economic efficiency, albeit with lower temperature resistance.
Alumina Hollow Sphere Standard Brick
Main Types of Lightweight Insulating and Refractory Bricks Lightweight insulating and refractory bricks can be classified into five major categories based on their material composition and operating temperature: 1. 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. 2. Lightweight Silica Bricks: With SiO₂ content ≥91%, these bricks have a bulk density of 0.8–1.2 g/cm³ and excellent acid resistance. They are commonly used in the arches of glass furnaces and hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. 3. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and 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. 4. Aluminum Oxide Hollow Sphere Bricks: With Al₂O₃ content ≥90% and a bulk density of 1.0–1.8 g/cm³, these bricks exhibit a refractoriness of up to 1,800°C and a thermal conductivity of 0.08–0.15 W/m·K. They are ideal for specialized applications in aerospace, nuclear power, and other critical environments. 5. 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 (1,200–1,700°C). They are widely used in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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: Gases—such as CO₂—are generated through reactions between dolomite and sulfuric acid, creating porosity within the brick. – Hollow Sphere Method: Aluminum oxide or mullite hollow spheres serve as aggregate, which is then directly pressed and sintered. For ultra‑lightweight bricks (density <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, reducing 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 (density 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), lightweight bricks minimize heat loss from furnace walls, 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: 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 efficiency, 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 1400°C, exhibit a thermal conductivity of 0.15–0.35 W/m·K, and 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 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 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%, these bricks have a bulk density of 1.0–1.8 g/cm³ and a refractoriness reaching 1800°C, along with a thermal conductivity of 0.08–0.15 W/m·K. They are ideal 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 used in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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: Gases—such as CO₂—are generated through the reaction between dolomite and sulfuric acid, creating porosity within the brick. Hollow Sphere Method: Aluminum oxide or mullite hollow spheres serve as aggregate, which is directly pressed and sintered. Ultra‑lightweight bricks (with densities below 0.4 g/cm³) often utilize fly ash beads—by‑products of pulverized coal combustion—as lightweight aggregates. Application Scenarios Industrial Kilns: Used as insulation layers or backings in hot blast stoves, soaking furnaces, and cracking furnaces, reducing 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 densities ranging from 0.26 to 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), lightweight bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: Featuring densities that are only 1/4 to 1/3 those of heavy bricks, they simplify kiln designs and structures. Rapid Heating and Cooling: With low thermal mass, 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: 600–1800°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 efficiency, 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: 1. 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 1400°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. 2. 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 hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. 3. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and 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. 4. Alumina Hollow Sphere Bricks: With Al₂O₃ content ≥90% and a bulk density of 1.0–1.8 g/cm³, these bricks feature a fire resistance of up to 1800°C and a thermal conductivity of 0.08–0.15 W/m·K. They are ideal for specialized applications in aerospace, nuclear power, and other critical environments. 5. 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 widely used in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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: Gases—such as CO₂—are generated via the reaction between dolomite and sulfuric acid, creating porosity within the brick. – Hollow Sphere Method: Hollow alumina/mullite spheres serve as aggregate, which is then directly pressed and sintered. For ultra‑lightweight bricks (density <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, reducing 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: Alumina hollow sphere bricks are utilized in nuclear power plants; perlite bricks (density 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), lightweight 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 conventional heavy bricks, they simplify kiln designs and reduce structural loads. Rapid Heating and Cooling: Featuring low thermal mass, they are well suited for intermittent kiln operations. Environmentally Friendly and Safe: Free from asbestos and formaldehyde (as in the case of 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: 600–1800°C (depending on type) | GB/T 3994–2005 Thermal Shock Resistance: 25 cycles (water quench at 1100°C) | GB/T 30873–2014 Note: Alumina hollow sphere bricks and mullite bricks deliver the best high‑temperature performance but come at a higher cost; clay bricks offer the greatest economic efficiency, though their temperature resistance is relatively lower.
Mullite Lightweight Insulation Brick 1.0
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 1400°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 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 resistance (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. Alumina 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 1800°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 (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: Gases—such as CO₂—are generated through the reaction between dolomite and sulfuric acid, creating porosity within the brick. 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: Alumina hollow sphere bricks are utilized in nuclear power plants; perlite bricks (with densities ranging from 0.26 to 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), lightweight 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, these bricks simplify kiln designs. Rapid Heating and Cooling: Featuring low thermal mass, 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: 600–1800°C (depending on type) | GB/T 3994–2005 Thermal Shock Resistance: 25 cycles (water quench at 1100°C) | GB/T 30873–2014 Note: Alumina hollow sphere bricks and mullite bricks deliver the best high‑temperature performance but come at a higher cost; clay bricks offer the greatest economic efficiency, though their temperature resistance is relatively lower.
Mullite Lightweight Insulation Brick 0.8
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 1400°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 excellent acid resistance. They are commonly used in the arches of glass furnaces and hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and a bulk density of 0.8–1.5 g/cm³, these bricks offer high-temperature resistance up to 1450°C, with 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: Comprising ≥90% Al₂O₃ and boasting 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 ideal for specialized applications in aerospace, nuclear power, and other critical environments. Lightweight Mullite Bricks: With Al₂O₃ content ranging from 60% to 75% and 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 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: A chemical reaction is utilized—such as the interaction between dolomite and sulfuric acid—to generate gases (e.g., CO₂) that 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-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, reducing 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 a density of 0.26–0.3 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), lightweight bricks minimize heat loss from furnace walls, 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 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: 600–1800°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 efficiency, though their temperature resistance is relatively lower.
Mullite Lightweight Insulation Bricks
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 1400°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 high-temperature resistance up to 1450°C, with 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 1800°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 (1200–1700°C). They are used in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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: 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 (density <0.4 g/cm³), fly ash-derived cenospheres (a byproduct of pulverized coal combustion) 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, reducing 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 a density of 0.26–0.3 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), lightweight 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 heavy bricks, they simplify kiln design and construction. Rapid Heating and Cooling: Featuring low thermal mass, 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: 600–1800°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 efficiency, though their temperature resistance is relatively lower.
High-Alumina Lightweight Insulation Brick 1.0
Main Types of Lightweight Insulating and Refractory Bricks Lightweight insulating and refractory bricks can be classified into five major categories based on their material composition and operating temperature: 1. 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 1400°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. 2. Lightweight Silica Bricks: With SiO₂ content ≥91%, these bricks have a bulk density of 0.8–1.2 g/cm³ and excellent acid resistance. They are commonly used in the arches of glass furnaces and hot blast stoves, boasting a thermal conductivity of 0.2–0.4 W/m·K. 3. High-Alumina Lightweight Bricks: Containing ≥65% Al₂O₃ and 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 ideal for thermal insulation in high‑temperature zones within industries such as metallurgy and ceramics. 4. 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. 5. 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 employed in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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: Gases—such as CO₂—are generated via the reaction between dolomite and sulfuric acid, creating porosity within the brick. – Hollow Sphere Method: Hollow alumina/mullite spheres serve as aggregate, which is directly pressed and sintered. For ultra‑lightweight bricks (density <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, reducing 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 (density 0.26–0.3 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), lightweight bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: Their density is only 1/4 to 1/3 that of traditional heavy bricks, simplifying kiln design and construction. Rapid Heating and Cooling: Due to their small heat capacity, they are particularly 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: 600–1800°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 advantage, though their temperature resistance is relatively lower.
High-alumina lightweight insulation brick 0.8
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 1400°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 kilns 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 high-temperature resistance up to 1450°C, with 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 1800°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 (1200–1700°C). They are used in cracking furnaces, ceramic roller hearth kilns, and similar applications. 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: 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: Aluminum oxide or mullite hollow spheres serve as aggregate, which is then directly pressed and sintered. For ultra‑lightweight bricks (with densities <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, reducing 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 kilns, helping to reduce kiln weight. Specialized Fields: Aluminum oxide hollow sphere bricks are used in nuclear power plants; perlite bricks (with densities of 0.26–0.3 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), lightweight bricks minimize heat loss from furnace walls, resulting in fuel savings of 20%–60%. Lightweight: With densities only 1/4 to 1/3 those of heavy bricks, they simplify kiln designs and reduce structural complexity. Rapid Heating and Cooling: Featuring low thermal mass, 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: 600–1800°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 advantage, though their temperature resistance is relatively lower.
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