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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...
High-strength anti-seepage castables are an important material with high strength, low thermal conductivity, and strong anti-penetration properties. It is mainly used to prevent water or other liquids from penetrating and ensure the stability and durability of the structure. In many fields, high-strength anti-seepage castables play a vital role. First, in the field of underground engineering, high-strength anti-seepage castables are widely used in the anti-seepage protection of underground water pools, water storage tanks, liquid storage tanks, and large reservoirs. It can effectively prevent water leakage, thereby protecting these structures from erosion by water and other liquids, ensuring their safe and stable operation. Secondly, in the field of industrial kilns, high-strength anti-seepage castables also play an indispensable role. Especially in the aluminum casting industry, aluminum alloy, and other industries, high-strength anti-seepage castables are widely used for anti-seepage protection of key parts such as the bottom of the electrolytic cell and the bottom of the aluminum melting furnace. It can prevent the penetration and erosion of permeable and active substances such as aluminum liquid and electrolyte into the kiln, thereby extending the service life of the kiln and improving production efficiency. In addition, high-strength anti-seepage castables are also widely used in different parts...
The technical requirements for pouring boiler castables involve several key steps and details to ensure that the castables can be evenly and effectively covered on the boiler surface, providing good insulation and protection. The following is a brief overview of the technical requirements for pouring boiler castables: First, before pouring, adequate preparation must be done. This includes cleaning the dirt and rust on the surface of the internal equipment of the boiler and checking for looseness, cracks, scratches, etc. At the same time, it is also necessary to check whether the accessories such as heating rods and valves are normal. In addition, mold-making is also an important step before pouring. The template should have sufficient rigidity and strength to ensure it does not deform during the pouring process, and the template joints should be tight to prevent leakage. Secondly, the stirring and mixing of the castable is a key link. Clean water should be used for stirring, and the stirring time and liquid addition amount should be strictly controlled according to the construction instructions. For high-strength wear-resistant castables, it is necessary to dry-mix the mixture and binder evenly, then add an appropriate amount of water for wet mixing. The stirred...
The working environment of an electric furnace smoke hood is relatively special. It has been in a high temperature, corrosion, and smoke environment for a long time, so the lightweight castable used is required to be high. When selecting lightweight castables for electric furnace smoke hoods, it is necessary to comprehensively consider factors such as the material’s high-temperature resistance, corrosion resistance, mechanical strength, thermal stability, thermal conductivity, volume stability, construction performance, and cost. At present, the more commonly used lightweight castables on the market are mainly aluminum silicate, high aluminum, corundum, and mullite. Aluminum silicate castables have good high-temperature resistance and corrosion resistance, and at the same time, the cost is low, so they can be used in some occasions where performance requirements are not high. High aluminum and corundum castables have high refractoriness and corrosion resistance and are suitable for high temperatures and strong corrosion environments, but the cost is also relatively high. Mullite castables have high thermal stability and creep resistance and are suitable for long-term high-temperature working occasions. According to the specific use occasions and requirements of electric furnace smoke hoods, aluminum silicate or high aluminum lightweight castables can be selected. Although aluminum silicate castables have low...
Refractory heat-insulating castables are a type of material specially used in high-temperature environments. They have excellent fire-resistant properties and heat-insulating effects. This material plays a vital role in the construction of furnaces. Furnaces are common equipment in various industrial production and laboratory research, and they generate extremely high temperatures during operation. To ensure the normal operation of the furnace and extend its service life, refractory heat-insulating castables must be used in key parts. These parts include but are not limited to the furnace, furnace door, furnace wall, and furnace bottom. The furnace is the main working space inside the furnace and is usually subjected to the impact of the highest temperature. Therefore, the inner wall of the furnace is often paved with refractory heat-insulating castables to prevent heat from dissipating too quickly and protect the furnace body from high-temperature damage. At the same time, this material can effectively reduce the waste of heat energy and improve the working efficiency of the furnace. The furnace door is an important component of the furnace, which is responsible for the sealing and opening of the furnace. Since the furnace door needs to be opened and closed frequently during operation, it is often affected...
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