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 & Delivery

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 applied in the hot face and cold face of furnace linings?: Monolithic refractories are applied in the hot face and cold face of furnace linings through different methods. For the hot face, monolithic refractories are typically sprayed or troweled onto the surface, forming a dense and heat-resistant layer. This layer protects the furnace from high temperatures and thermal shocks. In contrast, for the cold face, monolithic refractories are usually cast or gunned into place, creating a more insulating layer. This layer helps to maintain a lower temperature on the outer surface of the furnace lining. Overall, the application of monolithic refractories in both the hot face and cold face ensures optimal performance and durability of furnace linings.

Q: What are the main factors affecting the thermal expansion of monolithic refractories?: The thermal expansion of monolithic refractories is influenced by various factors. These factors comprise the type of refractory material, the temperature range, the chemical composition, and the physical structure of the refractory. To begin with, the thermal expansion behavior of a refractory is significantly determined by its type of material. Different types of refractories, such as alumina-based, silica-based, and magnesia-based refractories, possess varying coefficients of thermal expansion (CTE). For instance, alumina-based refractories generally exhibit a lower CTE in comparison to silica-based refractories. Consequently, the choice of refractory material holds great influence over its thermal expansion characteristics. Secondly, the thermal expansion of a refractory is affected by the temperature range to which it is exposed. As the temperature rises, the refractory material expands due to the absorption of thermal energy. However, different refractories demonstrate different expansion behaviors depending on temperature. Some refractories may exhibit a linear or near-linear expansion with temperature, while others may display non-linear or step-wise expansion. Hence, the temperature range of operation is a critical factor in determining the suitability of a refractory for a specific application. The chemical composition of the refractory also has an impact on its thermal expansion. The presence of various chemical elements and compounds in the refractory material can influence its expansion behavior. For instance, the addition of specific oxides, like magnesia or zirconia, can modify the CTE of the refractory. Similarly, impurities or variations in the chemical composition can introduce discrepancies in expansion characteristics among refractories of the same type. Lastly, the physical structure of the refractory, encompassing factors such as porosity, density, and microstructure, can influence thermal expansion. The existence of open or closed pores within the refractory can affect its ability to expand uniformly under thermal stress. The density of the refractory also plays a role, as denser refractories tend to have lower thermal expansion. Moreover, the microstructure, including grain size and orientation, can impact the overall expansion behavior of the refractory. To conclude, the primary factors influencing the thermal expansion of monolithic refractories include the type of refractory material, temperature range, chemical composition, and physical structure. A comprehensive understanding of these factors is crucial in selecting the appropriate refractory for a specific application to ensure optimal performance and durability.

Q: What are the common manufacturing processes used for monolithic refractories?: The common manufacturing processes used for monolithic refractories include: 1. Mixing: The first step in the manufacturing process is the proper mixing of the raw materials. This involves carefully measuring and combining the different ingredients to ensure a homogeneous mixture. 2. Wetting: Once the ingredients are mixed, water or a liquid binder is added to wet the mixture. This helps in improving the workability and plasticity of the material, making it easier to shape and mold. 3. Forming: The wet mixture is then shaped into the desired form using various techniques such as casting, gunning, ramming, or extrusion. Casting involves pouring the wet mixture into a mold and allowing it to solidify, while gunning uses a spray gun to apply the material onto a surface. Ramming involves compacting the wet mixture into a mold using a ramming tool, and extrusion involves forcing the wet mixture through a die to create specific shapes. 4. Drying: After forming, the shaped monolithic refractory is dried to remove any excess moisture. This is typically done in a controlled environment with specific temperature and humidity conditions to prevent cracking or warping. 5. Firing: Once dried, the monolithic refractory is fired at high temperatures to achieve its desired properties. This process, known as sintering, helps in bonding the particles together and increasing the strength and stability of the material. 6. Finishing: After firing, the monolithic refractory may undergo additional finishing processes such as grinding, polishing, or coating to improve its surface quality and enhance its performance. These common manufacturing processes ensure the production of high-quality monolithic refractories with consistent properties and performance characteristics.

Q: How do monolithic refractories improve the efficiency of ladle and tundish preheating stations?: Monolithic refractories play a crucial role in enhancing the efficiency of ladle and tundish preheating stations. These refractories are specifically designed to withstand high temperatures and thermal shocks, making them ideal for use in preheating applications. One key way in which monolithic refractories improve efficiency is by providing excellent heat insulation. These refractories have low thermal conductivity, meaning they minimize heat loss from the preheating station to the surroundings. As a result, more heat is retained within the ladle or tundish preheating station, leading to faster and more efficient heating of the vessel. Additionally, monolithic refractories offer superior heat retention properties. Once heated, these refractories have the ability to store and release heat gradually over time. This characteristic allows for a more consistent and controlled heating process in the ladle or tundish preheating station. By maintaining a stable temperature, the refractories ensure that the vessel is heated uniformly and prevent thermal shocks that could lead to cracking or other damage. Furthermore, monolithic refractories have excellent resistance to chemical reactions and erosion caused by molten metals and slag. Ladles and tundishes are often exposed to corrosive environments, and the use of monolithic refractories helps to protect against degradation and extend the lifespan of the preheating station. This durability reduces the need for frequent maintenance and replacement, leading to cost savings and improved overall efficiency. In summary, monolithic refractories improve the efficiency of ladle and tundish preheating stations by providing excellent heat insulation, heat retention, and resistance to chemical reactions. These properties result in faster and more uniform heating, reduced heat loss, and increased durability of the preheating station. Ultimately, these benefits contribute to improved productivity and cost-effectiveness in the steelmaking process.

Q: How do monolithic refractories prevent slag penetration?: Slag penetration is effectively prevented by monolithic refractories due to several mechanisms. Firstly, the high-quality materials used in monolithic refractories, such as alumina, silica, and magnesia, possess exceptional resistance to slag attack. These materials have a high melting point and can endure the corrosive nature of the slag. Secondly, the design of monolithic refractories incorporates a dense and compact structure that minimizes porosity. Slag penetration occurs when the molten slag infiltrates the pores and cracks of the refractory material. By reducing porosity, monolithic refractories create a barrier that restricts the entry of slag into the refractory lining. Furthermore, monolithic refractories can be chemically bonded to the substrate, resulting in a strong and impermeable bond. This bond enhances resistance to slag penetration by eliminating any gaps or weak points through which the slag could seep. Moreover, monolithic refractories can possess a high thermal shock resistance. Slag penetration is often intensified by thermal cycling, wherein the refractory material undergoes rapid temperature changes. Monolithic refractories with high thermal shock resistance can endure these temperature fluctuations without cracking or spalling, therefore decreasing the risk of slag penetration. Additionally, the effective prevention of slag penetration relies on the proper installation and maintenance of monolithic refractories. The refractory lining must be appropriately designed, with the right thickness and geometry, in order to provide maximum protection against slag attack. Regular inspection and repair of any damaged or worn-out areas can also prevent slag penetration. In summary, monolithic refractories prevent slag penetration through their excellent resistance to slag attack, dense structure, chemical bonding, high thermal shock resistance, and proper installation and maintenance. By working together, these factors create a robust and impermeable barrier that safeguards the underlying substrate from the corrosive effects of slag.

Q: How long is the lifespan of monolithic refractories in iron and steel applications?: The lifespan of monolithic refractories in iron and steel applications can vary depending on several factors such as the specific type of refractory material used, the operating conditions, and the maintenance practices. However, on average, monolithic refractories in iron and steel applications can last anywhere from a few months to several years.

Q: What are the advantages of using plastic refractories in the iron and steel industry?: Plastic refractories provide numerous benefits in the iron and steel industry. Firstly, their thermal insulation properties are exceptional. They possess a low thermal conductivity, enabling them to effectively retain heat and prevent excessive heat loss during manufacturing. This is critical for the proper functioning of furnaces and equipment, as maintaining high temperatures is essential. Secondly, plastic refractories exhibit superior resistance to chemical attack and corrosion. They can endure exposure to various chemicals, including molten metals and slag, without deteriorating or losing their structure. This is particularly important in an industry where materials frequently encounter highly corrosive substances. Moreover, plastic refractories offer the advantage of easy installation and repair. Unlike other refractory materials, they can be easily shaped and molded into the desired form. This allows for precise fitting and swift installation. Additionally, if damaged or worn, they can be easily repaired or patched, reducing downtime and maintenance costs. Additionally, plastic refractories possess excellent mechanical strength and abrasion resistance. This enables them to endure the physical stresses and mechanical forces present in the iron and steel industry, such as vibrations, impacts, and mechanical loading. Their high resistance to wear and tear ensures longevity and reduces the need for frequent replacements. Lastly, plastic refractories have a high resistance to thermal shock. They can withstand rapid temperature changes without cracking or spalling. This is advantageous in an industry where materials are subjected to extreme temperature differentials, such as during the heating and cooling cycles of furnaces. In conclusion, the utilization of plastic refractories in the iron and steel industry provides numerous advantages including excellent thermal insulation, resistance to chemical attack, ease of installation and repair, good mechanical strength, abrasion resistance, and high thermal shock resistance. These properties make plastic refractories an ideal choice for various applications, ensuring efficient and reliable operations.

Q: How do monolithic refractories resist chemical attack from molten metals and slags?: Monolithic refractories resist chemical attack from molten metals and slags due to their chemical composition and structure. They are typically designed with high levels of resistance to corrosion and erosion, making them suitable for harsh environments. Additionally, they have low porosity, which reduces the penetration of molten metals and slags into the refractory material. The presence of certain additives and bonding agents further enhances their chemical resistance, preventing reactions between the refractory and the molten substances. Overall, monolithic refractories offer a strong barrier against chemical attack, ensuring their durability and longevity in such demanding conditions.

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 converters. Monolithic refractories are versatile and can be shaped and installed easily, making them suitable for lining various types of furnaces and converters, including ladle refining furnaces and VOD converters.

Q: How do monolithic refractories contribute to the overall efficiency of ladle cleaning operations?: Monolithic refractories contribute to the overall efficiency of ladle cleaning operations by providing a durable and heat-resistant lining that can withstand high temperatures and chemical reactions. This lining helps to prevent the erosion and corrosion of the ladle, ensuring its longevity and reducing the need for frequent repairs or replacement. Additionally, monolithic refractories offer excellent thermal insulation, which helps to maintain the desired temperature of the ladle's contents and minimize heat loss. This ultimately improves the ladle's efficiency and reduces energy consumption during ladle cleaning operations.

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