MULLITE HEAT INSULATING CASTABLE

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Refractory Castable For Fireplace and Industrial Furnace

characteristic:
construction convenient
using for furnace lining
wear-resistant,flame-proof

Item				insulating castable
Item		JNL-45	JBN-40	JGL-85	JGL-70	JDL-80	JLL-75	JLL-60
Al₂O₃ %		45	40	80	70	80	75	60
CaO %		—	—	—	—	2.5	—	—
Refractoriness °C		1700	1670	1790	1750	1790	1790	1750
Linear change affter sintered ≤±1%		1350°C ×3h	1000°C ×3h	1500°C ×3h	1450°C ×3h	1500 °C ×3h	1500°C ×3h	1450°C× 3h
110°C±5 After drying	Crushing strength Mpa	8	20	35	30	40	30	25
110°C±5 After drying	Modulus rupture Mpa	1	—	5	5	6	5	4
Bonder		clay	water glass	cement	cement	lower cement	phosphate	phosphate

High-strength lightweight Insulating refractory castable

1. low bulk density, low thermal conductivity, high intension.

2. good integrity and excellent air impermeability.

3. be used as cover of warm or low- temperature heat engineering equipments

4. It can also be thensulating material in hot temperature furnace.

5. way of usagre: daubing or casting.

The index is as follows:

Q:How do monolithic refractories prevent heat loss through convection?: Monolithic refractories prevent heat loss through convection by providing a continuous and dense structure that minimizes the movement of air or gases, thereby reducing the transfer of heat through convection currents.

Q:What are the specific requirements of monolithic refractories for ladle purging applications?: The specific requirements of monolithic refractories for ladle purging applications include high thermal shock resistance, excellent erosion resistance, good slag resistance, and low porosity. Thermal shock resistance is crucial in ladle purging applications as the refractory material needs to withstand rapid temperature changes without cracking or spalling. This is particularly important during ladle purging, where the ladle is exposed to high temperatures during molten metal pouring and then quickly cooled down during purging. Erosion resistance is another important requirement for monolithic refractories in ladle purging applications. The refractory material should be able to withstand the erosive action of molten metal streams and metalloids during purging. It should have a high resistance to chemical attack, preventing the material from deteriorating or eroding away. Slag resistance is also necessary for monolithic refractories used in ladle purging. The refractory material should have good resistance to the corrosive effects of slag, which can be present in ladles during purging. Slag can cause chemical reactions that can degrade the refractory material, leading to premature failure. Low porosity is an essential requirement for monolithic refractories in ladle purging applications. Low porosity ensures that the refractory material is impermeable to molten metal, preventing it from infiltrating the material and causing damage. This also helps to maintain the integrity and performance of the refractory lining during ladle purging. Overall, monolithic refractories for ladle purging applications need to exhibit high thermal shock resistance, excellent erosion resistance, good slag resistance, and low porosity to ensure the durability and longevity of the refractory lining in ladles during purging operations.

Q:What are monolithic refractories and how are they different from other refractory materials?: Monolithic refractories, unlike bricks or tiles, are refractory materials that are not pre-formed into specific shapes or sizes. Instead, they are composed of a mixture of aggregates, binders, and additives, which are then installed and cured to create a solid and dense structure. One notable difference between monolithic refractories and other refractory materials is their versatility and ease of installation. While traditional bricks or tiles require skilled labor and careful assembly, monolithic refractories can be poured, sprayed, or gunned into place, allowing for a faster and more efficient installation process. This makes them particularly suitable for complex shapes or hard-to-reach areas. Another distinction lies in the physical properties of monolithic refractories. Unlike bricks and tiles, which are known for their mechanical strength and resistance to thermal shock, monolithic refractories can be customized to exhibit a wide range of properties. Depending on the specific application requirements, they can be engineered to have excellent thermal insulation, superior corrosion resistance, or enhanced abrasion resistance. This adaptability makes monolithic refractories suitable for various industries, including steel, cement, glass, and petrochemical. Furthermore, monolithic refractories have the advantage of being able to expand and contract with temperature changes, unlike rigid brick structures. This thermal flexibility helps prevent cracking and damage caused by thermal cycling, thus prolonging the lifespan of the refractory lining. Additionally, monolithic refractories offer better refractory integrity and reduced joint failure since they do not have seams or weak points that are susceptible to thermal stresses. In conclusion, monolithic refractories are a versatile and convenient type of refractory material that can be tailored to meet specific application requirements. Their easy installation, thermal flexibility, and customizable properties distinguish them from other refractory materials like bricks or tiles.

Q:How do monolithic refractories contribute to the overall efficiency of ladle slagging operations?: Monolithic refractories play a vital role in enhancing the overall efficiency of ladle slagging operations, which involve removing impurities from molten metal in a ladle before pouring it into molds or further processing. One of the primary benefits of monolithic refractories is their capacity to withstand high temperatures, a crucial factor in ladle slagging operations. The refractory lining in the ladle must endure the intense heat generated by the molten metal and slag, as well as the chemical reactions occurring during the process. By possessing high thermal stability, monolithic refractories prevent the lining from cracking or deteriorating, thus ensuring the integrity of the ladle and maintaining its efficiency. Furthermore, monolithic refractories offer excellent resistance against chemical erosion and corrosion. In the ladle slagging process, the molten metal and slag may contain impurities and aggressive chemicals such as sulfur, phosphorus, and other oxides. These substances can attack and degrade the lining of the ladle, compromising its efficiency. However, monolithic refractories are specifically designed to withstand these chemical attacks, thereby prolonging the lifespan of the ladle and reducing the need for frequent repairs or replacements. Moreover, monolithic refractories possess exceptional thermal insulation properties. Precise temperature control is essential in ladle slagging operations to facilitate desired chemical reactions and efficient impurity removal. The thermal insulation provided by monolithic refractories helps maintain a consistent temperature within the ladle, preventing heat loss and facilitating optimal slagging conditions. Additionally, this insulation minimizes energy consumption and improves the overall energy efficiency of the ladle slagging process. In conclusion, monolithic refractories make significant contributions to the overall efficiency of ladle slagging operations. Their ability to endure high temperatures, resist chemical erosion, and provide thermal insulation ensures the integrity and longevity of the ladle. By reducing the need for frequent repairs and enabling precise temperature control, monolithic refractories optimize the slagging process, leading to enhanced productivity and cost-effectiveness.

Q:How do monolithic refractories impact the quality and performance of iron and steel products?: The quality and performance of iron and steel products rely heavily on monolithic refractories. These refractories are designed to withstand extreme temperatures and harsh conditions, making them indispensable in the iron and steel industry. To begin with, monolithic refractories contribute to the overall quality of iron and steel products by providing exceptional thermal insulation. They help maintain a consistent and controlled temperature during the manufacturing process, which is especially crucial in blast furnaces where temperatures can reach up to 2,000 degrees Celsius. By effectively insulating the furnace walls, monolithic refractories minimize heat loss and ensure efficient energy utilization. As a result, the products have higher quality and improved mechanical properties. Additionally, monolithic refractories offer superior resistance to chemical and physical wear. In the steelmaking process, the molten metal and slag can be highly corrosive, leading to erosion and deterioration of the refractory lining. However, monolithic refractories are engineered to withstand such aggressive environments, providing excellent resistance to chemical attack and mechanical stress. By preserving the integrity of the lining, they prevent contamination and extend the lifespan of the furnace or ladle, ultimately enhancing the quality of the final iron and steel products. Moreover, monolithic refractories allow for greater design flexibility and ease of installation. Unlike traditional refractory bricks that require precise placement and fitting, monolithic refractories can be applied as a single, cohesive material. This enables the creation of more intricate shapes and structures, optimizing furnace design and enhancing thermal efficiency. Additionally, the ease of installation reduces downtime during maintenance and repairs, ensuring uninterrupted production and minimizing disruptions to the manufacturing process. In conclusion, monolithic refractories have a significant impact on the quality and performance of iron and steel products. They provide exceptional thermal insulation, resist chemical and physical wear, and offer greater design flexibility. By maintaining consistent temperature environments, preventing contamination, and enabling efficient production processes, monolithic refractories contribute to the production of high-quality iron and steel products that meet the rigorous demands of various industries.

Q:What are the recommended storage and handling practices for monolithic refractories?: The recommended storage and handling practices for monolithic refractories are crucial to ensure their optimal performance and longevity. Here are some key practices to follow: 1. Storage: Monolithic refractories should be stored in a clean, dry, and well-ventilated area. The storage facility should be protected from moisture, extreme temperatures, and direct exposure to sunlight. Ideally, the refractories should be stored on pallets or racks to prevent contact with the ground and minimize the risk of damage. 2. Handling: It is essential to handle monolithic refractories with care to avoid any physical damage. Refractories should be lifted and moved using appropriate lifting equipment, such as forklifts or cranes, to prevent excessive stress or strain on the material. Avoid dropping or dragging the refractories, as this can lead to cracks or fractures. 3. Packaging: If the monolithic refractories are supplied in packaging, it is important to inspect the packaging for any signs of damage or moisture before accepting the delivery. Damaged packaging can indicate potential damage to the refractory material. If any anomalies are noticed, it is advisable to inform the supplier immediately. 4. Moisture control: Monolithic refractories are susceptible to moisture absorption, which can lead to reduced performance and structural integrity. It is crucial to protect the refractories from direct contact with water or excessive humidity during storage and handling. If refractories become wet, they should be dried thoroughly before use to eliminate any absorbed moisture. 5. Stack height: When storing monolithic refractories, it is important to consider the stack height. Excessive stacking can result in pressure on the lower layers, leading to deformation or cracking. Follow the manufacturer's recommendations for maximum stack height to ensure the refractories' structural integrity. 6. Regular inspection: Regularly inspect the refractory material for any signs of damage or degradation during storage and handling. Look for cracks, spalling, or any other visible abnormalities. If any issues are identified, consult the manufacturer or a refractory expert for guidance on whether the material is still suitable for use. By following these recommended storage and handling practices, you can minimize the risk of damage to monolithic refractories and optimize their performance, ultimately extending their service life and ensuring their effectiveness in high-temperature applications.

Q:How are monolithic refractories used in the repair and maintenance of ladle and tundish linings?: Monolithic refractories, widely utilized in the steel industry, are a specific type of refractory material employed for the repair and maintenance of ladle and tundish linings. These linings, integral to the transportation and treatment of molten metal during the steelmaking process, can deteriorate over time when exposed to high temperatures and corrosive conditions. This deterioration poses various issues, including heat loss, contamination of the molten metal, and reduced lifespan of the refractory lining. To tackle these problems, monolithic refractories serve as effective repair and maintenance materials. Typically composed of different refractory aggregates, binders, and additives, monolithic refractories are available in various forms like castables, gunning mixes, and ramming mixes. These materials are designed for easy application and shaping, conforming to the specific geometry and dimensions of the ladle or tundish lining. During the repair process, damaged sections of the lining are removed, and monolithic refractories are then applied. Castables can be poured and vibrated into place, while gunning mixes can be sprayed using a high-pressure gunning machine. On the other hand, ramming mixes are manually compacted into the lining using a ramming tool. Monolithic refractories offer several advantages when it comes to the repair and maintenance of ladle and tundish linings. Firstly, their flexibility ensures easy installation and shaping, resulting in a snug fit to the lining. This maximizes the effectiveness of the refractory lining in preventing heat loss and maintaining the integrity of the ladle or tundish. Secondly, monolithic refractories exhibit exceptional resistance to thermal shock and chemical attack. This durability enables them to withstand the harsh conditions encountered in ladles and tundishes. Even when subjected to repeated heating and cooling cycles, they remain intact without cracking or spalling, providing long-lasting protection to the lining. Lastly, monolithic refractories can be easily repaired and replaced as needed. The application and removal processes are relatively straightforward, facilitating efficient maintenance of ladle and tundish linings. This minimizes downtime and ensures the overall productivity of the steelmaking process. In conclusion, monolithic refractories play a vital role in the repair and maintenance of ladle and tundish linings. Their easy application, exceptional resistance to thermal shock and chemical attack, and ease of repair make them ideal materials for extending the lifespan and optimizing the performance of these linings in the steel industry.

Q:How do monolithic refractories contribute to reducing downtime in iron and steel plants?: Monolithic refractories contribute to reducing downtime in iron and steel plants by providing enhanced durability and resistance to high temperatures, chemical corrosion, and mechanical wear. These refractories can be quickly and easily installed, repaired, or replaced, minimizing the time required for maintenance and reducing production interruptions. Their versatile and customizable nature allows for efficient lining of various equipment, such as furnaces, ladles, and converters, ensuring a continuous and uninterrupted production process.

Q:How do monolithic refractories withstand the mechanical impacts in furnace door applications?: Monolithic refractories have been specially designed to endure the mechanical impacts experienced in furnace door applications as a result of their unique properties and composition. These refractories are manufactured from a solitary piece of material, which eliminates the necessity for joints or seams that are susceptible to cracking or failure under mechanical stress. An essential characteristic of monolithic refractories is their elevated density, which grants them exceptional strength and resistance against mechanical impacts. Their compact structure makes them less prone to cracking or fracturing when exposed to sudden or repeated impacts, such as the opening or closing of a furnace door. Along with their density, monolithic refractories also possess substantial tensile strength and toughness. These qualities enable them to absorb and disperse the energy from mechanical impacts, reducing the likelihood of damage or failure. This is particularly crucial in furnace door applications, where the refractories are constantly subjected to the stress of door movement. Moreover, monolithic refractories frequently incorporate additives or bonding agents that enhance their mechanical properties. These additives may consist of fibers or aggregates that fortify the structure and improve impact resistance. They can also enhance the refractory's ability to endure thermal cycling, which is common in furnace door applications. Overall, monolithic refractories are meticulously engineered to withstand the mechanical impacts encountered in furnace door applications. Their dense composition with high strength, combined with the utilization of additives and bonding agents, guarantees their durability and longevity in these demanding environments.

Q:How do monolithic refractories improve the efficiency of ladle and tundish drying systems?: The efficiency of ladle and tundish drying systems can be greatly improved by incorporating monolithic refractories. These refractories play a vital role in the steel industry, specifically in the drying process of ladles and tundishes prior to casting molten steel. One key advantage of monolithic refractories lies in their ability to create a seamless lining devoid of joints or gaps. This characteristic ensures that the lining remains strong and resistant to heat loss during the drying process. By maintaining a uniform and continuous lining, monolithic refractories facilitate faster and more effective drying of ladles and tundishes. Moreover, monolithic refractories possess exceptional thermal insulation properties. They exhibit low thermal conductivity, which enables them to effectively retain heat and prevent its dissipation into the surroundings. This insulation capability promotes better heat retention within ladles and tundishes during drying, ultimately leading to quicker and more energy-efficient drying. Furthermore, monolithic refractories demonstrate superior resistance to thermal shock. The drying process subjects ladles and tundishes to rapid temperature changes, which can induce thermal stress and result in cracks or spalling of the lining. However, monolithic refractories exhibit high resistance to thermal shock, ensuring the durability and longevity of the lining. This resistance to thermal shock minimizes the need for frequent repairs or replacements, thereby enhancing the overall efficiency of ladle and tundish drying systems. Additionally, monolithic refractories exhibit good corrosion resistance. They are specifically designed to withstand the harsh conditions and corrosive environments that ladles and tundishes encounter during the drying process. This corrosion resistance helps maintain the integrity of the lining, preventing any degradation or damage that could potentially impact the efficiency of the drying systems. In conclusion, the incorporation of monolithic refractories into ladle and tundish drying systems enhances their efficiency by providing a seamless lining, excellent thermal insulation, resistance to thermal shock, and corrosion resistance. These properties contribute to faster drying times, energy savings, reduced maintenance needs, and increased equipment longevity.

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