Low Nitrogen Carbon Raiser Graphite Powder

Low Nitrogen Carbon Raiser Graphite Powder

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Loading Port:: Shekou

Payment Terms:: TT or LC

Min Order Qty:: 20 m.t

Supply Capability:: 1000 m.t/month

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Packaging Detail:25kg paper bag into 1t weaving bag 5kg, 10kg and 20kg weaving bag into 1t weaving bag 25kg weaving bag put on pallet covered with entanglement wrap product direct into packing bag 25kg paper bag put on pallet covered with entanglement Wrap 25kg weaving bag into 1t weaving bag.

Delivery Details: 7 days

Low Nitrogen Carbon Raiser Graphite Powder

Q: How are monolithic refractories used in the repair and maintenance of ladle and tundish covers?: Due to their excellent thermal resistance and durability, monolithic refractories are commonly utilized for repairing and maintaining ladle and tundish covers. These covers play a crucial role in the containment of molten metal and the prevention of heat loss during the steelmaking process. When exposed to high temperatures and thermal cycling, ladle and tundish covers can undergo wear and tear, resulting in cracks, spalling, or even complete failure. This is where monolithic refractories come into play. Monolithic refractories are refractory materials that are not shaped and can be easily molded and applied to damaged areas of ladle and tundish covers. They can be cast, gunned, or sprayed onto the surface, enabling quick and efficient repairs. Typically, these refractories consist of a matrix material, such as alumina, silica, or magnesia, along with various additives and bonding agents. The specific composition depends on the application requirements and severity of operating conditions. The repair process begins by identifying the damaged areas of the ladle or tundish cover. Any loose or damaged refractory material is removed, and the surface is prepared for the application of the monolithic refractory. This may involve cleaning, roughening, or even preheating the surface, depending on the specific requirements. The monolithic refractory is then mixed with water or a suitable binder to achieve a workable consistency. It is then applied to the damaged areas using the appropriate method, such as casting or spraying. After application, the refractory material is allowed to dry and cure, typically through controlled heating. Once cured, the monolithic refractory forms a robust and durable lining that can withstand the high temperatures, thermal cycling, and chemical reactions occurring during ladle and tundish operation. It provides excellent thermal insulation, minimizing heat loss and reducing energy consumption. Moreover, monolithic refractories exhibit superior resistance to slag, metal penetration, and erosion, ensuring extended service life for ladle and tundish covers. They also possess good thermal shock resistance, enabling them to endure rapid temperature changes without cracking or spalling. In conclusion, monolithic refractories are indispensable for repairing and maintaining ladle and tundish covers due to their thermal resistance, durability, and ease of application. Their ability to withstand high temperatures, thermal cycling, and chemical reactions ensures the integrity and efficiency of ladle and tundish operations in the steelmaking industry.

Q: In iron and steel industry, the main raw materials for blast furnace ironmaking are iron ore, coke and limestone. What's the use of limestone here?: At high temperatures, limestone (calcium carbonate) breaks down into lime (calcium oxide, which is useful) and carbon dioxide.

Q: How do monolithic refractories perform in rotary kiln applications?: Monolithic refractories are highly effective in rotary kiln applications due to their unique properties and characteristics. These refractories are designed to be installed as a single, solid unit, as opposed to traditional brick and mortar refractories. One of the key advantages of monolithic refractories in rotary kilns is their ability to withstand high temperatures and thermal stresses. Rotary kilns operate at extremely high temperatures, often reaching up to 3000 degrees Fahrenheit. Monolithic refractories are able to handle these extreme temperatures without cracking or failing, ensuring the longevity and reliability of the kiln. Another important performance aspect of monolithic refractories in rotary kilns is their ability to resist chemical attack. Rotary kilns are commonly used in industries such as cement production, where the materials being processed can be highly corrosive. Monolithic refractories offer excellent resistance to chemical attack, protecting the kiln from deterioration and extending its service life. Additionally, monolithic refractories are known for their excellent thermal conductivity and insulation properties. This helps to maintain consistent and efficient heat transfer within the kiln, improving the overall energy efficiency of the process. Furthermore, the installation of monolithic refractories in rotary kilns is relatively easy and quick compared to traditional brick and mortar refractories. The monolithic materials can be cast or gunned into place, forming a seamless lining that eliminates the need for individual bricks and mortar joints. This not only saves time during installation but also minimizes the potential for weak points or gaps in the lining, ensuring a more durable and effective refractory system. In summary, monolithic refractories offer exceptional performance in rotary kiln applications. Their ability to withstand high temperatures, resist chemical attack, provide efficient heat transfer, and offer easy installation make them a preferred choice for industries relying on rotary kilns for their production processes.

Q: What are the factors influencing the choice of monolithic refractories for different furnace types?: The choice of monolithic refractories for different furnace types is influenced by various factors that need to be considered in order to ensure optimal performance and efficiency. These factors include the operating temperature, type of heat transfer mechanism, chemical composition of the furnace atmosphere, thermal cycling, mechanical stresses, and specific application requirements. One of the primary factors to consider is the operating temperature of the furnace. Different monolithic refractories have different temperature limits, and it is crucial to select a refractory material that can withstand the specific temperature range of the furnace without significant degradation or failure. For high-temperature applications, materials like alumina, magnesia, and silica are commonly used due to their excellent thermal stability. The type of heat transfer mechanism is another important consideration. Furnaces can use various methods to transfer heat, such as radiation, conduction, or convection. Each of these mechanisms may require different refractory properties. For example, radiation-dominated furnaces may require a refractory material with high thermal conductivity to efficiently transfer heat, while convection-dominated furnaces may require a material with good resistance to gas flow erosion. The chemical composition of the furnace atmosphere is also a crucial factor. Depending on the process being carried out in the furnace, the atmosphere may contain highly corrosive gases or chemicals. In such cases, it is essential to select a monolithic refractory that is resistant to chemical attack and can maintain its structural integrity in the presence of aggressive substances. Thermal cycling, which involves repeated heating and cooling cycles, is another factor influencing the choice of monolithic refractories. Some refractory materials may be prone to thermal shock or spalling when subjected to rapid temperature changes. In contrast, others may have better resistance to thermal cycling, making them more suitable for applications that involve frequent temperature variations. Mechanical stresses, such as load or vibration, can also impact the choice of refractories. Furnaces that experience mechanical stresses require materials with good mechanical strength and resistance to abrasion. Refractory materials like silicon carbide or zirconia may be preferred in such cases due to their high strength and toughness. Lastly, specific application requirements should be considered when selecting monolithic refractories. Factors such as installation method, ease of maintenance, availability, and cost-effectiveness may influence the choice of refractory material. In summary, the choice of monolithic refractories for different furnace types is influenced by the operating temperature, heat transfer mechanism, chemical composition of the furnace atmosphere, thermal cycling, mechanical stresses, and specific application requirements. Considering these factors is essential to ensure the longevity, performance, and efficiency of the refractory lining in various furnace applications.

Q: What are the key properties of gunning mixes used for monolithic refractory repairs?: Gunning mixes used for monolithic refractory repairs must possess several key properties. These include: 1. Exceptional durability: Gunning mixes should display outstanding resistance to thermal shock, abrasion, and chemical attack. This quality is crucial in ensuring that the repaired refractory material remains intact in the face of the harsh conditions prevalent in industrial furnaces and kilns. 2. High strength: Gunning mixes need to possess a significant compressive strength to provide structural integrity to the repaired refractory lining. This is particularly important in areas subjected to high mechanical stress or load. 3. User-friendly application: Gunning mixes should have favorable gunning properties, simplifying and streamlining the application process. They should be easily sprayed or gunned onto the surface requiring repair, resulting in a smooth and even coating. 4. Rapid setting and drying: Gunning mixes should boast a swift setting and drying time to minimize downtime during repairs. This ensures that the repaired refractory lining can be promptly reintroduced into service, reducing any potential production losses. 5. Excellent adhesion: Gunning mixes should demonstrate exceptional adhesion to the existing refractory material. This guarantees a strong bond between the new repair material and the old lining, preventing any potential delamination or separation. 6. Thermal stability: Gunning mixes should possess a high resistance to thermal cycling and temperature fluctuations. They should retain their structural integrity and mechanical properties even under extreme heat conditions. 7. Chemical compatibility: Gunning mixes should be chemically compatible with the materials they come into contact with, such as molten metals or corrosive gases. This ensures that the repaired refractory lining can withstand the corrosive effects of these substances. In summary, the essential properties of gunning mixes for monolithic refractory repairs revolve around providing durability, strength, easy application, rapid setting, good adhesion, thermal stability, and chemical compatibility. These properties guarantee that the repaired refractory lining can effectively endure the challenging operating conditions in industrial furnaces and kilns, thereby extending their lifespan and reducing maintenance costs.

Q: What are the different types of monolithic refractories used in the iron and steel industry?: There are several types of monolithic refractories used in the iron and steel industry, including castables, ramming mixes, gunning mixes, and plastic refractories. Castables are a mixture of refractory aggregates, binders, and additives that can be poured and shaped into various forms. Ramming mixes are granular refractories that can be packed and tamped into place using a ramming tool. Gunning mixes are similar to ramming mixes but are applied using a gunning machine. Plastic refractories are moldable materials that can be shaped and installed by hand. These different types of monolithic refractories offer flexibility and ease of installation in various applications within the iron and steel industry.

Q: Can monolithic refractories be used for the lining of ladle refining furnaces and VOD converters?: Yes, monolithic refractories can be used for the lining of ladle refining furnaces and VOD (Vacuum Oxygen Decarburization) converters. Monolithic refractories are versatile materials that can be shaped and installed in various applications, including high-temperature environments like ladle refining furnaces and VOD converters. Monolithic refractories are composed of a single, homogeneous material, which makes them easy to install and repair. They can be either cast or gunned in place, providing flexibility in lining design and installation. The lining of ladle refining furnaces and VOD converters requires materials that can withstand high temperatures, chemical reactions, and mechanical stresses. Monolithic refractories, with their excellent thermal shock resistance and resistance to chemical attack, are well-suited for these demanding applications. In ladle refining furnaces, monolithic refractories are used to line the ladle, which holds and processes molten metal. These refractories help maintain the desired temperature and protect the ladle from the corrosive effects of molten metal and slag. They also provide insulation to minimize heat loss and improve energy efficiency. VOD converters are used in the steelmaking process to reduce the carbon content of molten steel. Monolithic refractories are used to line the converter's vessel and maintain the necessary temperature for the decarburization reaction. They also provide protection against the corrosive effects of molten metal and slag, ensuring the longevity and performance of the converter. Overall, monolithic refractories offer excellent properties for the lining of ladle refining furnaces and VOD converters. Their versatility, ease of installation, and resistance to high temperatures and chemical attack make them an ideal choice for these critical applications in the steel industry.

Q: What are the recommended installation techniques for monolithic refractories?: The installation techniques for monolithic refractories depend on the specific type and application of the refractory material. However, there are general guidelines that can be followed for most installations of monolithic refractories. 1. Surface Preparation: Prior to installing monolithic refractories, it is essential to ensure that the surface is clean, dry, and free from loose particles or contaminants. This can be accomplished by removing any existing refractory materials, thoroughly cleaning the surface, and allowing it to completely dry. 2. Mixing: Monolithic refractories are typically supplied in either a dry or wet form, depending on the specific material. If the refractory is in a dry form, it must be mixed with water or a suitable liquid binder to achieve a workable consistency. It is important to follow the manufacturer's guidelines for the correct mixing ratio and duration to ensure proper bonding and setting of the refractory material. 3. Application: The technique for applying monolithic refractories can vary depending on the specific material and desired installation method. Some common techniques include troweling, gunning, ramming, and casting. - Troweling: This involves manually applying the refractory material with a trowel, typically used for thin linings or patching small areas. - Gunning: Gunning is a method of applying refractory material using a gunning machine or handheld gun. It is suitable for large areas or areas that are difficult to access. The refractory material is mixed with water or a liquid binder and sprayed onto the surface at a high velocity. - Ramming: Ramming involves compacting the refractory material into place using a ramming tool or pneumatic hammer. It is commonly used for forming furnace linings or repairing damaged areas. - Casting: Casting refers to pouring the refractory material into a mold to create a desired shape or lining. It is often used for complex shapes or large-sized components. 4. Curing and Drying: Once the refractory material is applied, it must be properly cured and dried to achieve its maximum strength and thermal properties. The curing and drying process may vary depending on the specific material, but typically involves controlled heating at a gradual rate to eliminate any remaining moisture and allow the refractory to set and harden properly. It is important to note that these are general guidelines, and it is always recommended to consult the manufacturer's instructions and specifications for the specific monolithic refractory material being used. Following the recommended installation techniques will help ensure the proper performance and longevity of the refractory lining.

Q: How are monolithic refractories installed and repaired in iron and steel production facilities?: Monolithic refractories are vital components in iron and steel production facilities, as they provide insulation and protection against high temperatures, chemical corrosion, and mechanical wear. The installation and repair processes for monolithic refractories in these facilities require careful planning, expertise, and adherence to safety protocols. When installing monolithic refractories, the first step is to prepare the surface by removing any loose material and cleaning the area thoroughly. This ensures proper adhesion of the refractory material. The surface may also need to be roughened or textured to improve bonding. Next, the monolithic refractory material is mixed with water or a binder to create a workable consistency. It is then applied to the prepared surface using various methods such as casting, gunning, ramming, or troweling. The choice of application method depends on factors such as the type of refractory material, the area being repaired, and the desired outcome. During installation, it is essential to carefully follow the manufacturer's instructions regarding mixing ratios, curing times, and drying temperatures. Improper installation can lead to reduced refractory performance, premature failure, and safety hazards. Repairing monolithic refractories in iron and steel production facilities is an ongoing process due to the harsh operating conditions and mechanical stresses they endure. When a refractory lining shows signs of damage or wear, it is crucial to address the issue promptly to prevent further deterioration. The first step in repairing monolithic refractories is to assess the extent of the damage. This can be done through visual inspection, thermal imaging, or non-destructive testing techniques. Once the damage is identified, the repair method can be determined. Minor repairs can often be carried out using patching materials. These materials are typically the same or similar to the original refractory composition and are mixed with water or a binder to form a paste. The paste is then applied to the damaged area and allowed to cure. For more extensive repairs, the damaged refractory material may need to be removed entirely. This can be done through mechanical methods such as chipping, grinding, or cutting. After the damaged material is removed, the surface is prepared as mentioned earlier, and new refractory material is installed using the appropriate application method. It is important to note that the repair process should be conducted by trained personnel with expertise in refractory installation and repair. Safety precautions such as wearing protective clothing, using proper tools, and following established procedures should always be observed. In conclusion, the installation and repair of monolithic refractories in iron and steel production facilities require careful planning, adherence to manufacturer's instructions, and expertise in refractory materials. By following proper procedures and promptly addressing any damage, these facilities can ensure the longevity and efficiency of their refractory linings, ultimately contributing to the smooth operation of their production processes.

Q: How do monolithic refractories contribute to energy efficiency in iron and steel manufacturing?: Monolithic refractories contribute to energy efficiency in iron and steel manufacturing through their superior insulation properties and ability to withstand high temperatures. These refractories minimize heat loss, reducing the energy required for heating and maintaining the desired temperature in the manufacturing process. Additionally, their durability and resistance to thermal shock help to extend the lifespan of furnaces and other equipment, reducing the need for frequent repairs or replacements, further enhancing energy efficiency.

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