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Castables, also known as refractory castables, are composed of three parts: cement, aggregate, and admixture, and sometimes a glue accelerator is added. It is a granular and powdery material made of refractory materials and a certain amount of binder. It has High fluidity, and unshaped refractory material formed by casting. Refractory castables are usually classified according to the size of the porosity, the selected binder or bonding method, the type of aggregate, and the construction method. 1. According to the classification of cementation, refractory castables can be divided into hydration-bonded refractory castables, chemically bonded (including polymerization bonded) refractory castables, refractory castables combined with hydration and polymerization (typical representatives are low cement bonded refractory castables) There are four types of refractory castables combined with condensation. 2. According to whether the refractory castable contains cement or CaO content, it can be simply divided into four categories: ordinary refractory castable, low cement refractory castable, ultra-low cement refractory castable, and cement-free refractory castable. The castables produced by Xinhongji Refractory include non-stick aluminum castables, anti-seepage castables, self-retained high-temperature high-strength wear-resistant castables, lightweight thermal insulation castables, corrosion-resistant heavy castables, steel fiber castables, castable prefabricated parts, corundum mullite castables, silicon carbide castables.
Refractory material is an important industrial material, which is widely used in metallurgy, the chemical industry, construction, and other fields. At present, China is the world’s largest refractory producer and one of the major exporters. China’s refractory materials are mainly exported to Asia, Europe, North America, and other regions. Among them, the Asian region is the region with the largest export volume of refractory materials in China, mainly including India, Japan, South Korea, Pakistan, and other countries. Europe is also an important export destination of Chinese refractory materials, mainly including Germany, Britain, France, Italy, and other countries. In addition, China’s refractory materials are also exported to the United States, Canada, and other countries in North America. There are many reasons for the large export volume of China’s refractory materials. First of all, China has abundant resources of refractory materials, such as kaolin, bentonite, graphite, etc., which provide a basic guarantee for the production of refractory materials. Secondly, China’s refractory production technology is quite mature, the product quality is stable and reliable, and the price is relatively low, which makes Chinese refractory materials a competitive advantage in the international market. In addition, China’s refractory production enterprises are large in scale and...
The refractory material of the gasifier can be divided into three parts: the cone bottom, the cylinder body, and the vault. There is a certain expansion space between the vault and the furnace shell so that the lining refractory bricks expand upward when the gasifier is running. It can be divided into several layers from the inside to the outside. Taking the cylindrical refractory material as an example, it is divided into four layers: fireproof refractory material layer, backing layer, heat insulation layer, and compressible layer (the vault is the same as the cone bottom), the front An expansion gap of 3~5mm is reserved between the three layers. Expansion in the convenient radial direction is unrestricted. 1. Refractory bricks facing the fire The working environment of refractory bricks is very poor, and design units and users are very cautious about their structural design and material selection. A fireproof surface refractory layer: also known as hot surface brick, is a high-temperature-resistant, corrosion-resistant consumable layer. Typically, high chromium materials are required, which require high-temperature chemical stability, high creep strength, and thermal shock resistance. The thickness from the cylinder to the fire surface of the CWS gasifier is about 230mm. Use 90 chrome...
Alkaline refractory castables are castable refractory materials mainly composed of magnesium oxide, which is divided into basic castable materials such as magnesium, aluminum magnesium, spinel, magnesium, magnesium silicon, and magnesium carbon. Magnesia (periclase) refractory castable is made of fused magnesia or sintered magnesia aggregate and fine powder. The magnesia refractory castable combined with high magnesium cement has high purity, and a small line change rate after burning, It has the advantage of high softening temperature under load, but with the increase of heat treatment temperature, especially between 400~1200°C, the cementation will be lost due to the dehydration of magnesium hydroxide generated by the hydration of magnesia, and the combination of refractory aggregate and powder Very loose, and the solid phase reaction is very weak, resulting in a sharp drop in the strength of the refractory castable, prone to loosening and peeling. Magnesium refractory castables combined with water glass have the advantages of high strength, strong corrosion resistance of alkali and sodium salt melts, etc. However, due to the use of water glass as a binder, a large amount of sodium oxide or potassium oxide and silicon dioxide are brought in, which greatly reduces the refractoriness and load softening temperature of...
Low cement castables have the characteristics of high strength and high-temperature resistance. Low-cement castables refer to castables with a lower amount of cement. The cement dosage of refractory cement castables is generally 15%-20%, and the cement dosage of low-cement castables is about 5%, and some even reduce it to 1%-2%. The purpose of reducing the cement dosage is to improve the refractory of castables performance. It relies on the addition of several special raw materials to obtain good performance 1. Pure calcium aluminate cement, because of the high content of effective minerals CaO·Al2O3, the required strength can be obtained with less mixing. 2. Silica fume, glass beads with a SiO2 content between 93% and 98% and an average particle size of about 0.5 μm. After adding silica fume, the castable has good fluidity, low water demand for molding, low sintering temperature, and improved performance after heat treatment. 3. Alumina micro powder, is easier to participate in the reaction and improve the fire resistance of the material. 4. Water reducer, which can be adsorbed on the surface of the powder, and then produce electrostatic repulsion to disperse powder, so as to further play the role of micro powder. The production process...
A: Storage Lightweight acid-resistant castables must be stored in dry warehouses. B: Construction Instructions 1. Use a forced mixer. The mixing construction equipment should be cleaned, and different models should not be mixed and should be used according to the requirements. 2. This product is packed in 40kg bags, divided into aggregate mixture and binder in plastic bags. When stirring, the aggregate mixture and plastic bag binder must be poured into the stirring pot to start stirring. 3. It can be mixed and used immediately during construction, and the material should be gently inserted and lifted slowly with a vibrating rod to avoid forming holes, and it is best to form it at one time. When pouring a large amount in layers, the original pouring layer should be shaved before pouring. 4. Clean drinking water must be used, the pH value is between 6-8, and the amount of water added is 24%-27%. 5. The pouring surface of all molds should be coated with a layer of machine oil. 6. All embedded metal parts should be coated with a layer of asphalt paint before pouring. 7. The lightweight castable should be used within 0.5 hours after mixing. When the thickness of...
The chrome corundum brick product is made of α-Al2O3, adding the appropriate amount of chromium oxide powder and chrome corundum clinker fine powder, after molding, it is fired at high temperature. The chromium oxide content of sintered chromium corundum bricks is generally lower than that of fused cast chromium corundum bricks. It can also be prepared by the slurry pouring method. Mix α-Al2O3 powder and chromium oxide powder evenly, add debonding agent and an organic binder to make a thick slurry, add part of chromium corundum clinker at the same time, and make bricks by the grouting method. Fire again. It can be used as the inner lining of glass kilns, the cover brick of drawing glass flow holes, and the back lining of molten iron pretreatment equipment, waste incinerator, coal-water slurry pressurized gasifiers, etc. Now, the use of chrome corundum bricks has been widely used. One kind of chrome corundum brick is made of metal chromium slag as the main raw material. This product is widely used in zinc-tempering electric furnaces and evaporation kilns. Chrome corundum bricks have The functions of thermal shock stability and high-temperature creep meet the requirements of circular economy together. In the design of chrome...
Refractory bricks can be called clay bricks according to the alumina content of less than 55%, which is a neutral refractory material made of bauxite or other materials with high alumina content. High thermal stability, refractory temperature about 1700°C, used for glass melting furnace, cement rotary kiln, steelmaking electric furnace lining. Of course, there are also some high-alumina clay bricks and high-alumina brick products with high load softness, low creep, and low porosity. According to different application requirements, the ratio of materials is very important in production. High alumina bricks are mainly used for the masonry lining of blast furnaces, hot blast stoves, electric furnace roofs, blast furnaces, reverberatory furnaces, and rotary kilns. In addition, high alumina bricks are also widely used as open hearth furnace heat storage checker bricks, pouring system plugs, nozzle bricks, etc. High-alumina bricks and clay bricks not only have different alumina content, but also have similar production processes, but the amount of clinker mixed is high, up to 90-95%, and the firing temperature is much higher than that of clay bricks. In practical tests, primary and secondary high alumina bricks are mostly used in tunnel kilns, blast furnaces, furnace roofs, reverberatory furnaces, rotary kiln linings,...
The thermal explosion of refractory bricks refers to the temperature difference between the surface and the interior of the refractory bricks when the refractory bricks are subjected to rapid cooling and rapid heating. Due to the existence of refractory brick expansion joints, stress is generated inside the refractory brick masonry. The subsequent burst is called a thermal burst. 1. The mineral phases that make up siliceous refractory bricks, such as quartz, tridymite, and cristobalite, change in temperature as the crystal form of quartz changes, and the volume changes accordingly, so heating or cooling siliceous refractory brick structure masonry, need to pay special attention to the problem of the thermal burst. 2. Magnesia refractory bricks or magnesia-chrome refractory bricks are prone to thermal bursting when the temperature changes suddenly due to their large thermal expansion coefficient. 3. Insulating refractory bricks, due to their low thermal conductivity, the temperature gradient in the refractory bricks is large, and because of their relatively low strength, they are also prone to thermal explosion problems. The main products of Henan Xinhongji Refractory Material Co., Ltd. include high alumina bricks, clay bricks, lightweight insulation bricks, refractory castables, and shaped and unshaped materials of various grades of refractory...
4 physical indicators need to be tested when heat storage balls: 1. Refractoriness: refractoriness is the performance of resisting melting at high temperatures. The refractoriness mainly depends on the chemical composition of the heat storage ball and the fusible impurities in the material. Such as (FeO, NaO, etc.) content. 2. High-temperature structural strength (load softening temperature): high-temperature structural strength refers to the resistance of heat storage balls to withstand pressure at high temperatures without deformation. It is often evaluated by weight-softening temperature. 3. Thermal stability: Thermal stability refers to the ability to resist sudden changes in temperature without cracking or peeling off. Sometimes it is also called resistance to rapid cooling and rapid heating. 4. Volume stability: volume stability refers to the volume change percentage of the heat storage ball repeatedly heated and cooled at a certain temperature. Generally, under the action of multiple high temperatures, recrystallization and further sintering will occur in the composition, and residual expansion or contraction will occur.
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