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Refractory Materials for Tundish Linings and Precautions for Preheating

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Refractory Materials for Tundishes Tundish refractory linings comprise various components, including the vessel body, lid, upper and lower nozzles, stopper rods, slag-retaining weirs and dams, flow stabilizers, and impact pads. Refractory materials for tundishes are categorized into lining materials (working layer, permanent layer, and thermal insulation layer) and materials for continuous casting components and precast shapes. Due to the varying locations and operational requirements within the tundish, the physicochemical properties and performance characteristics of the refractory materials differ accordingly. High-quality refractory materials are essential for ensuring the service life of continuous casting tundishes; we can provide a full range of tundish refractory materials tailored to your specific requirements. Zircon bricks or precast blocks are utilized in the area of ​​the tundish bottom subject to molten steel impingement. Refractory Materials for Tundishes The tundish li...
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Refractory Materials Used in Waste Incinerator Equipment

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Besides daily household waste such as urban garbage, sewage sludge, and other pollutants, industrial waste constitutes the largest volume of waste generated. All of these wastes require harmless treatment. Waste treatment begins with urban waste incineration for sanitation purposes. Waste Treatment Equipment and Furnace Types Incineration equipment mainly consists of incinerators, including grate-type, moving bed type, and rotary kiln type. Refractory Materials Used in Waste Incinerator Grate-type incinerators introduce combustion gases from below the grate, driving the grate and continuously burning the waste. Because this method is suitable for many types of waste, it is widely used in first-tier cities. Moving bed incinerators use regenerable sand as a heat carrier and are used for instantaneous incineration of waste. Because the equipment is very easy to stop and is also very suitable for incinerating liquid waste, it is used for incinerating garbage, sewage sludge, and industria...
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The Influence of Two Different Molding Methods on the Properties of Silicon Nitride-Bound Silicon Carbide Bricks

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Silicon nitride-bonded silicon carbide refractories (Si₃N₄-SiC) possess excellent properties such as high strength, high temperature resistance, high thermal conductivity, and low coefficient of expansion, making them suitable for applications in marine pressurized boilers, particularly in areas subject to intense thermal shock, such as tuyeres, observation holes, and wall bricks. However, due to the irregular shape of furnace refractory bricks, uneven pressure transmission occurs during traditional machine pressing, leading to uneven density distribution in the finished product. When areas with lower density overlap with areas of concentrated thermal shock stress, these overlapping areas become weak points and crack initiation sites, reducing the refractory brick's thermal shock resistance. Therefore, achieving structural homogenization in irregularly shaped refractory brick products and improving their thermal shock resistance is crucial for enhancing their service life and saf...
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Characteristics and Optimization Points of Silicon Carbide Wear-Resistant Refractory Castables

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Silicon carbide wear-resistant castables possess the dual advantages of wear resistance and corrosion resistance. The most prominent property of silicon carbide castables is wear resistance, followed by corrosion resistance. The manufacturing process still uses traditional refractory castables as the framework, introducing a certain proportion of silicon carbide particles to form a composite structure of "refractory aggregate + silicon carbide". Rongsheng Silicon Carbide Wear-Resistant Castables Silicon carbide itself has high hardness and high grain boundary strength, allowing it to preferentially bear stress under erosion and friction conditions, thus slowing down matrix wear. Therefore, the overall wear resistance coefficient decreases, and the service life can typically be extended by one to two times. At the same time, silicon carbide has a large wetting angle with molten metal and slag, making it difficult to be wetted. Acidic and alkaline media also have difficulty co...
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Refractory Materials for Molten Reduction Furnace

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Refractory materials for smelting reduction furnaces. Smelting reduction ironmaking is a novel process that uses little or no coke, reducing iron oxides in a high-temperature molten state and separating slag from iron to obtain carbon-containing molten iron similar to that produced in a blast furnace. It features a short metallurgical process, smaller scale, and less environmental pollution. However, due to its extensive and complex development process, huge investment, and the fact that many engineering problems could only be correctly resolved through industrial production practice, it was once stagnant. With a deeper understanding of its theoretical technology and pressure from ecological environment and natural resources, the development of smelting reduction and direct ironmaking technologies has accelerated. After decades of research and development, more than 30 smelting reduction ironmaking processes have emerged, but the COREX smelting reduction ironmaking process is currently...
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What are the Factors that Cause Damage to High-Chrome Bricks during the Use of Gasifiers?

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The refractory brick layer on the fire-facing side of the gasifier, as a consumable layer requiring high temperature resistance, corrosion resistance, and erosion resistance, is generally made of high-purity chromium oxide material, also known as chromium aluminum zirconium brick or high-chrome brick . This refractory material is required to possess excellent high-temperature resistance, high creep strength, thermal shock stability, and good high-temperature chemical stability.  Rongsheng  High-Chromium Bricks During use, the main factors contributing to the damage of high-chromium bricks used in gasifiers include: Chemical Erosion High-chrome bricks are primarily eroded by molten slag during use, followed by erosion from strongly reducing gases within the furnace. Slag erosion involves the dissolution of ZrO2 and Al2O3 from the bricks into the slag. Additionally, SiO2 and CaO from the slag strongly penetrate the bricks and react with refractory components to form a thick alte...
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Construction Process of Rotary Kiln Lining

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Large rotary kilns are mostly lined with refractory bricks . The main methods for lining construction are as follows. Template Method The template method is mostly suitable for circumferential continuous joint masonry. See the diagram below: Figure: Schematic diagram of  rotary kiln lining construction  using the template method (circumferential continuous joint lining) The lining is constructed from the lowest point of the cross-section in two circumferential directions. When the height exceeds the kiln's centerline, a mold is set up, and the lining is closed from both directions towards the highest point of the cross-section, with support provided as construction progresses until the locking is complete. The mold shown in the diagram is a relatively simple one, entirely manual, resulting in low construction efficiency. To improve efficiency, many companies have adopted pneumatic support rings. The equipment has two rows of pneumatic support devices, significantly improving c...
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