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Customers who purchase refractory products often require materials that can withstand high temperatures, thermal shock, and other harsh conditions. Purchasing refractories may be of interest to several aspects of refractories, including: Performance: Customers may be interested in refractory performance characteristics such as the ability to withstand high temperatures and thermal shock, wear and corrosion resistance, and overall durability. Cost: Refractory materials can vary in price, so customers may be interested in finding good value for their money. This may involve considering the initial cost of the material as well as its life expectancy and maintenance costs. Environmental Impact: Customers are increasingly aware of the environmental impact of the products they use, and refractories are no exception. Customers may be interested in more environmentally friendly materials, such as those that are recyclable or that emit lower levels of pollutants during use. Ease of Use: Customers may also be interested in materials that are easy to install and maintain, especially when using these materials in complex or difficult applications. Availability: Delivery availability and lead times can be a concern for customers, especially when they need to replace or repair refractories quickly to avoid downtime in their operations. Overall, customers purchasing refractory products...
The inconsistent color of high alumina bricks may be caused by many factors, such as grade content, firing temperature, firing time, raw material ratio, and other factors, the following are some possible reasons: Different production processes: In the production process of high alumina bricks, the added raw materials, temperature, pressure, and other factors will affect its chemical composition and physical properties, thereby affecting its color. Different production processes of different manufacturers may also lead to inconsistencies in color. Different firing temperatures: the firing temperature of high alumina bricks will also affect its color, too high or too low firing temperature may cause color changes. Different sources of raw materials: Different sources of raw materials for high alumina bricks will also affect their color, and there may be differences in mineral content and mineral composition in different regions. Different surface treatment methods: Different surface treatment methods of high alumina bricks may also lead to inconsistent colors, such as different surface glazes. To sum up, the inconsistency of the color of high alumina bricks may be caused by the interaction of many factors, which needs to be analyzed in detail. The reasons for the black heart of high alumina bricks may be...
The main functions of the boiler furnace wall are: 1. The heat insulation function prevents the loss of heat in the boiler, reduces the heat dissipation loss of the boiler as much as possible, and ensures the economy of the boiler operation. 2. Sealing function. When the boiler operates under negative pressure, it prevents the outside cold air from leaking into the furnace and flue to ensure the economy of operation; when the boiler operates under positive pressure, it prevents flames and smoke from ejecting, ensuring the work and Sanitation. 3. Form the flue gas flow channel, so that the flue gas in the boiler flows through each heating surface in sequence according to a certain channel. Boiler walls shall meet the following requirements: 1. Good heat insulation 2. Good sealing 3. Sufficient heat resistance 4. Certain mechanical strength What are the reasons for the boiler wall falling off? The reason why the boiler wall falls off is more complicated. Here are a few possible reasons: Temperature and pressure changes during boiler operation: The boiler will be continuously impacted by high temperature and high pressure during normal operation. If the refractory material of the furnace wall is of poor quality...
Limestone is heated to about 900°C by 1150°C kiln flue gas in the preheater, and about 30% of it is decomposed. It is pushed into the rotary kiln by a hydraulic push rod, and the limestone is sintered at 1200°C in the rotary kiln. Decomposition into CaO and CO2. There are roughly three types of refractory materials for the lining, one is magnesia-alumina spinel bricks for the calcined zone, high-alumina bricks for the transition zone, clay bricks for the preheating zone, and refractory fiber or lightweight bricks for the heat insulation layer. The kiln surface temperature of the two forms is 300-350℃; one kind of calcined zone is spinel light and heavy composite brick, and the surface temperature of the shell is below 250°C; The body surface temperature is also 250°C or less. In the 16.1~19.55m of the calcination zone, andalusite bricks are used instead of spinel composite bricks, the surface temperature of the kiln shell is lowered, the weight of the kiln body is reduced, and the performance of hanging the kiln skin is also good. After 2 years of use, the kiln skin is removed, and the andalusite bricks are well preserved. , The composite spinel brick peels...
The thermal conductivity of the secondary high alumina brick is usually around 1.0W/(m·K). This value refers to the ability of the heat flow per unit area to pass through the material in a unit of time, that is, the speed at which the material conducts heat. The smaller the thermal conductivity, the better the thermal insulation performance of the material, and vice versa. It should be noted that the specific thermal conductivity of secondary high alumina bricks produced by different manufacturers may be slightly different, and the specific value should be confirmed according to the specific product. In addition, the performance of secondary high alumina bricks is not only affected by their thermal conductivity but also by other factors, such as density, compressive strength, etc. Multiple factors need to be considered comprehensively when selecting and using. Thermal conductivity has an important influence on the kiln because the heat loss and heat balance of the kiln are closely related to thermal conductivity. First of all, the heat loss of the kiln refers to the heat energy lost during the operation of the kiln. When the thermal conductivity of the furnace wall material of the kiln is high, the heat can be...
The shuttle kiln is a traditional kiln mainly used for the production of ceramics, bricks, building materials, etc. It gets its name from the shape of the shuttle inside the kiln, through which raw materials and products can be fed into and out of the kiln. The kiln body space (kiln chamber) of the shuttle kiln is composed of the kiln wall, kiln roof, and kiln car lining bricks. The inner kiln wall of the shuttle kiln is made of lightweight refractory bricks with better resistance to rapid cooling and rapid heating. The inner surface of the insulation layer can be pasted with 50mm thick high-temperature resistant refractory fiber to prolong the service life of the heat insulation material. In order to improve the strength and airtightness of the kiln, the outside of the kiln wall is usually wrapped with a layer of 3-5mm thick steel plate. The modern all-refractory fiber shuttle kiln directly uses refractory bolts to fix the refractory fiber blocks on the inner side of the metal shell. Heat Storage and Energy Saving Mode of Shuttle Kiln 1. The heat storage and energy saving of the kiln is accomplished through its own heat storage burner, which is...
High alumina bricks and clay bricks are common refractory materials, and their quality can be judged from the following aspects. Clay bricks and high-alumina bricks have different aluminum content, and the color is different. The clay is red, the aluminum content is high, yellow, and the higher the aluminum, the whiter. 1. Appearance quality: Appearance quality is one of the important criteria for judging the quality of bricks. Generally speaking, the appearance of high alumina bricks is relatively flat and smooth, without obvious damage and cracks, and the color is uniform. The appearance of clay bricks may have some irregular surfaces, and the color will be slightly different, but there should not be too many defects such as damage and cracks. 2. Dimensional accuracy: Dimensional accuracy is another important indicator for judging the quality of bricks. High alumina bricks generally have high dimensional accuracy, and the differences in parallelism and verticality between bricks are small. Clay bricks may have some deviations in dimensional accuracy, which need to be screened or classified according to standards. 3. Sound detection: Gently tap the bricks with your hands to judge whether the sound is crisp or not. This is another way to judge the...
Foundry electric furnace is a kind of equipment that melts metal or alloy material and then casts it into shape. Its internal temperature is as high as hundreds to thousands of degrees Celsius, so it needs to be lined with high-temperature refractory materials. Common refractory materials for foundry electric furnaces include: High alumina brick: made of kaolin, alumina, and other raw materials, it has the characteristics of high strength, strong corrosion resistance, high-temperature resistance, etc., and is usually used for the lining of electric furnace walls, furnace roofs, furnace bottoms, and other parts. Silica bricks: made of silicon raw materials, have the characteristics of high refractoriness, good wear resistance, acid, and alkali corrosion resistance, etc., usually used for the lining of the furnace wall, furnace throat, and other parts of the electric furnace. Magnesia brick: It is made of raw materials such as light-burned magnesium powder and light-burned magnesia powder. It has the characteristics of high-temperature resistance, good thermal conductivity, and alkali resistance. It is usually used for the lining of the furnace body and throat of the electric furnace. Carbon brick: made of coke, graphite, and other raw materials, it has the characteristics of high-temperature resistance and good electrical...
Zirconia corundum brick is a high-temperature material mainly composed of zirconia (ZrO2) and alumina (Al2O3). The name of the zirconia corundum brick comes from the corundum (Al2O3) in its main components, zirconia (ZrO2) and alumina (Al2O3). Zirconium corundum brick is a white solid formed by melting alumina powder and zircon sand containing 65% zirconia and 34% silicon dioxide in an electric furnace and then pouring it into the model to cool. The composition of the eutectoid and the glass phase of the stone is a eutectoid of the corundum phase and the zirconite phase, and the glass phase is filled between their crystals. Zirconium corundum bricks have high compressive strength, high-temperature stability, and corrosion resistance, so they are widely used in high-temperature industries and scientific fields. It can withstand use under severe conditions such as high-temperature thermal shock, thermal stress, and chemical erosion. Common applications include high-temperature furnaces, melting furnaces, electrolytic cells, etc. The load-softening temperature of zirconium corundum bricks is around 1700°C. Zirconium corundum brick is a high-temperature material, mainly composed of zirconia and alumina, which has good high-temperature stability and corrosion resistance, so it is widely used in industrial and scientific fields under high-temperature environments. The load softening...
The thermal shock resistance of refractory materials plays a vital role in industrial production and experiments in high-temperature environments. This article introduces some effective measures that can help improve the thermal shock resistance of refractory materials to ensure the stability and reliability of materials in high-temperature and deformation environments. To improve the thermal shock resistance of refractory materials, the following measures can be taken: 1. Optimize formula design: through optimizing formula design, select appropriate materials and proportions to improve the high-temperature resistance and thermal shock resistance of materials. 2. Adding micro-strengthening agent: Adding micro-strengthening agents, such as fibers, particles, grains, etc., to the refractory material can increase the interface strength of the material, thereby improving the thermal shock resistance. 3. Increase the porosity of the material: Appropriately increasing the porosity of the material can improve the thermal expansion and energy absorption capacity of the material, thereby enhancing its thermal shock resistance. 4. Improve the thermal stability of the material: By improving the chemical composition and structure of the material, its thermal stability at high temperatures is improved, thereby improving its thermal shock resistance. 5. Adopt composite structure design: By adopting composite structure design, such as multi-layer composite structure, cross-layer structure,...
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