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Refractory castables are an indispensable material in constructing high-temperature industrial kilns and furnaces. There are many types of refractory castables on the market, so there are also differences in classification. Some are classified according to composition, some according to kilns, and some according to applications. Therefore, we often see a lot of classified articles, but no matter how to classify, refractory castables need to be reasonably selected according to the specific situation of use. Today, the editor will briefly introduce the classification of refractory castables from the main components of refractory castables. 1. Silicate refractory castables Silicate refractory castables are the most widely used type, mainly based on silicates, supplemented by appropriate amounts of clay, aluminates, and other additives. Silicate refractory castables have high erosion resistance and high-temperature resistance and are suitable for lining and masonry of high-temperature kilns, converters, electric furnaces, and other equipment. 2. Aluminate Refractory Castables Aluminate refractory castables are another common type, the main component of which is aluminate materials, such as high-aluminum glass slag, iron-aluminum slag, etc. Aluminate refractory castables have excellent refractory and corrosion resistance and are suitable for the selection of refractory materials in high-temperature processes such as metallurgy and steelmaking. 3. Silicon...
Casables are mainly divided into castables for ordinary buildings and refractory castables for high-temperature kilns. They are amorphous materials. Ordinary castables for building houses usually refer to materials cast in the construction of building walls, which are usually not refractory. Refractory castables are a kind of castables used for the construction of high-temperature kiln linings. There are many types of them. Today, the editor will take you to understand what refractory castables are. Refractory castables are usually composed of refractory aggregates, powders, and binders. However, sometimes to improve the refractory properties of refractory castables, various refractory raw materials are added to them, such as stainless steel fibers, inorganic fibers, corundum, and other refractory materials with refractory properties to improve the refractory properties of castables, to ensure that they can work normally during the operation of high-temperature kilns. There are many types of refractory castables. Generally, there are two main types of refractory castables in the use of high-temperature kilns: lightweight thermal insulation castables and heavy refractory castables. Lightweight thermal insulation castables are divided into clay and high-alumina according to the raw materials, such as lightweight acid-resistant castables, lightweight alkali-resistant castables, etc. There are many types of them. We generally look...
The permanent layer castable is a high-performance refractory material made through strict processes. It uses high-quality raw materials and undergoes multiple processes such as high-temperature calcination, crushing, screening, and grinding to ensure that its quality and performance meet the standards. In the batching process, a reasonable aggregate particle size ratio is carried out, and imported high-temperature resistant binders, zircon powder, beryl powder, anti-cracking agents, and anti-seepage agents are added, and the mixture is made by fully mixing. These steps and material selections make the permanent layer castable have better performance in terms of refractoriness, slag resistance, erosion resistance, and thermal shock resistance. A refractory material mainly used in kiln transfer bags in the steel industry. In this scenario, it exhibits many excellent characteristics: resistance to erosion by molten steel and molten iron, strong resistance to extreme cold and heat, high softness, strong impact resistance, high load softening temperature, high high-temperature compressive strength, high high-temperature flexural strength, good slag resistance, etc. Therefore, it is widely used in various large and small transfer ladles such as molten iron ladles, ferrosilicon ladles, tundishes, and linings of spheroidizing ladles. The excellent performance and reliability of permanent layer castables provide important support and guarantee for...
Refractory bricks are a type of refractory material used for the main body of high-temperature industrial kilns. They play a vital role in high-temperature equipment such as kilns, furnaces, chimneys, etc. So, what are refractory bricks made of? This is a question that many people want to know. Today, the editor will take you to learn about it. From the perspective of the more commonly used refractory bricks on the market, the current common refractory bricks mainly include high-alumina bricks, clay bricks, carbon-containing refractory bricks, zirconium-containing refractory bricks, corundum bricks, chromium-containing refractory bricks, magnesium-containing refractory bricks, etc. Different types of refractory bricks have different compositions, and the raw materials are a variety of refractory materials, including alumina, silicates, silica, magnesium oxide, etc. These raw materials are usually processed by mixing, grinding, molding, and other processes to form blanks. High alumina bricks generally use bauxite as the main raw material, and then add bauxite clinker powder and fine powder, as well as a certain proportion of kyanite powder, and use pulp liquid as a binder. It is a kind of aluminum silicate refractory material, the main component of which is Al2O3. Among them, Al2O3 content greater than 48% can be called...
Refractory high-alumina bricks are a kind of shaped refractory material with an alumina content greater than 75%. They are widely used in the construction of various high-temperature kilns. There are many classifications of refractory high-alumina bricks, and there are differences in the raw material ratio according to the different parts of the high-temperature kilns. Today, the Xinhongji Refractory will mainly take you to understand the classification and introduction of refractory high-alumina bricks. 1. Classification based on different raw material ratios Refractory high-alumina bricks are mainly classified according to different raw material ratios. There are first-level high-alumina bricks, second-level high-alumina bricks, third-level high-alumina bricks, special-grade high-alumina bricks, corundum bricks, low creep high-alumina bricks, dense high-alumina bricks, aluminum carbide high-alumina bricks, andalusite high-alumina bricks, etc. These are several common high-alumina bricks in the construction of high-temperature kilns. According to different uses, we can choose different brick types. 2. Classification by appearance From the appearance point of view, high-alumina bricks are mainly divided into standard bricks, ordinary bricks, wedge-shaped bricks, special-shaped bricks, and special-shaped bricks. According to the different parts of use, we will choose different shapes. Sometimes if the part of the kiln is special, we can also customize special-shaped and high-alumina...
High-temperature refractory brick is a special refractory material, and the choice of its material is closely related to the high-temperature environment it needs to withstand. Generally speaking, high-temperature refractory bricks are mainly composed of oxides or non-oxides with high melting points and high stability to ensure that their physical and chemical properties can remain stable under high-temperature conditions. Common high-temperature refractory brick materials include siliceous, clay, high alumina, magnesia, chromium, corundum, etc. Among them, siliceous refractory bricks are mainly composed of silicon dioxide, have excellent acid corrosion resistance, and are mainly used in acid furnaces. Clay refractory bricks are made of clay as the main raw material and are fired at high temperatures. They have good thermal stability and thermal shock resistance. High alumina refractory bricks have excellent high-temperature resistance due to their high aluminum content and are widely used in the masonry of high-temperature furnaces. In addition, magnesia and chromium refractory bricks have excellent alkaline corrosion resistance and oxidation resistance due to their high magnesium and chromium content and are suitable for alkaline furnaces and high-temperature oxidizing atmospheres. Corundum refractory bricks are made of corundum (a high-purity alumina crystal) as the main raw material. They have extremely high refractoriness...
High alumina cement is a special cement with the characteristics of fast hardening, high strength, heat resistance, and corrosion resistance. Its unique properties make it widely used in certain specific engineering fields. The following is a specific description of the application scope of high alumina cement: 1. Emergency repair project: Since high alumina cement has the characteristics of fast hardening, it can reach a higher strength in a shorter time. Therefore, in projects that require rapid hardening, such as emergency repairs when bridges, tunnels, roads, etc. are damaged, high alumina cement can play an important role. 2. High-temperature environment engineering: High alumina cement has high heat resistance and can maintain good strength at high temperatures. Therefore, it is suitable for some projects in high-temperature environments, such as steelmaking furnace foundations, blast furnace foundations, ceramic industrial equipment, etc. In these projects, high alumina cement can effectively resist high-temperature erosion and ensure the stability and safety of the project. 3. Corrosion-resistant engineering: High alumina cement has good corrosion resistance and can resist the erosion of some acidic or alkaline substances. Therefore, in some projects with strong corrosiveness, such as chemical industrial equipment foundations, sewage treatment plants, marine engineering, etc., high alumina cement...
Refractory materials are materials that can maintain stability and strength in high-temperature environments and are widely used in various high-temperature industrial fields, such as steel, ceramics, glass, cement, and other industries. According to different chemical compositions and manufacturing processes, refractory materials can be divided into the following main types: 1. Siliceous refractory materials: With silicon dioxide as the main component, they have high refractoriness and chemical stability, and are often used in high-temperature furnaces, glass-melting furnaces, etc. 2. Clay refractory materials: With clay minerals as the main component, they have good thermal stability and slag resistance, and are widely used in various thermal equipment. 3. High-alumina refractory materials: With alumina as the main component, they have higher refractoriness and slag resistance, and are suitable for high temperature and highly corrosive environments, such as steelmaking converters, electric furnaces, etc. 4. Magnesium refractory materials: With magnesium oxide as the main component, they have high refractoriness, low thermal conductivity, and good slag resistance, and are often used in high-temperature furnaces, ceramic firing kilns, etc. 5. Carbonaceous refractory materials: Carbon is the main component, with high thermal conductivity, low thermal expansion coefficient, and good chemical stability, suitable for high temperatures and strong reducing environments,...
Refractory construction is a demanding and technical project, which involves the selection of materials, control of the construction environment, and mastery of construction technology. When carrying out refractory construction, the following points should be noted: 1. Material preparation: First of all, it is necessary to ensure that refractory materials that meet the standards are used, and unqualified materials must not be used. The types, specifications, and performance of the materials should meet the design requirements, and there should be corresponding qualification certificates. 2. Construction environment: The construction environment has a great influence on the performance of refractory materials, so the temperature and humidity of the construction environment must be strictly controlled. Construction under high temperature or high humidity may affect the hardening and strength development of refractory materials, and even cause problems such as cracking and falling of materials. 3. Construction technology: Construction personnel should have certain experience in refractory construction and master the correct construction technology. During the construction process, operations should be carried out strictly by the construction specifications to ensure that each process meets the design requirements. 4. Fire prevention measures: Refractory construction involves high-temperature operations, so necessary fire prevention measures must be taken. Obvious fire prevention...
Silicon nitride-bonded silicon carbide bricks refer to refractory products made of SiC and Si as raw materials and fired by nitridation. This product first appeared in the late 1960s. It is characterized by Si3N4 as a binder, excellent mechanical properties, thermal stability, and chemical stability, and is widely used in high-temperature industrial fields. In terms of performance, silicon nitride bonded silicon carbide bricks have high strength, high hardness, excellent wear resistance and corrosion resistance, as well as good thermal shock resistance and high-temperature stability. Its low thermal expansion coefficient can adapt to dimensional changes in high-temperature environments. In addition, silicon nitride-bonded silicon carbide bricks have good thermal conductivity, can effectively transfer heat, and improve the thermal efficiency of the equipment. In terms of application, silicon nitride-bonded silicon carbide bricks are mainly used in high-temperature industrial fields such as high-temperature furnaces, ceramic product firing, and high-temperature chemical reaction vessels. It can work stably for a long time at high temperatures and does not require frequent maintenance and replacement. In addition, silicon nitride-bonded silicon carbide bricks can also be used to manufacture precision devices such as high-temperature sensors and heat exchangers. Its excellent performance and stability make it an ideal material choice...
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