Refractory Bricks Manufacturer

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...

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...

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...

Specifications of high-alumina refractory bricks. High-alumina refractory bricks refer to a type of aluminum silicate refractory material with an alumina content of 48% or higher. They are made from bauxite or other high-alumina raw materials through forming and calcining. They have high thermal stability and a refractoriness above 1770°C. They also have excellent slag resistance. Contact Rongsheng Refractory for detailed dimensions of high-alumina refractory bricks . Introduction to Special-Shaped High-Alumina Bricks High-alumina special-shaped bricks are refractory products with specific, non-standard shapes, made primarily from high-alumina bauxite clinker through meticulous processing and specialized molding techniques. Their alumina content varies depending on the grade, typically ranging from 55% or higher. They are designed to meet the specialized refractory shape and performance requirements of complex structural components in various industrial furnaces. They occupy a crucial...

Porosity is an important indicator of refractory bricks. It is one of the reference indicators for thermal shock resistance, mechanical strength, volume stability, thermal conductivity, etc. Therefore, when choosing refractory bricks, we need to pay special attention to porosity. 1. What is Porosity? Terminologically, porosity is also called "apparent porosity," which is the ratio of the volume of open pores in a refractory material to its total volume. Lightweight Insulating Bricks of High Porosity 2. The Impact of Porosity on Refractory Materials Porosity is inversely proportional to thermal shock resistance, mechanical strength, and volume stability. Higher porosity reduces strength, but increased porosity also reduces the thermal conductivity of refractory bricks, making them more suitable for insulation in high-temperature kilns. Regarding thermal shock resistance, higher porosity in refractory bricks can lead to uneven internal thermal expansion at high temperatures, re...

Mullite insulation bricks are high-alumina refractory materials with mullite (3Al₂O₃·2SiO₂) as the primary crystalline phase. Their alumina (Al₂O₃) content typically ranges from 65% to 75%, resulting in excellent high-temperature resistance and thermal insulation properties. They are available in three different bulk densities: 0.8 g/cm³, 1.0 g/cm³, and 1.2 g/cm³, suited to varying temperatures and operating conditions. Mullite Insulation Bricks Characteristics of Mullite Insulation Bricks  Excellent Thermal Insulation: Mullite insulation bricks have low thermal conductivity, effectively reducing heat loss, improving kiln insulation , and reducing energy consumption.  Low heat capacity, energy-saving and high efficiency. Due to its low thermal conductivity, this material stores less heat energy, making it particularly suitable for intermittent kilns (such as shuttle kilns), significantly reducing heating energy consumption and improving thermal efficiency.  High refracto...