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Although high-alumina bricks and mullite bricks are mainly made of alumina, there are still differences between the two. High-alumina bricks are made of calcined bauxite, and mullite bricks are made of sintered or fused mullite. Not the same, please inquire about specific prices. High-alumina bricks are different according to the content of aluminum oxide (Al2O3). Currently, there are four grades commonly used: 55-60% (level III), 65-70% (level II), and 75% (level I) ), 80% (special). High-alumina products are a kind of neutral refractory material, which is made of bauxite or other materials with high alumina content and fired. It has high thermal stability, the refractory temperature is 1700°C, and the upper limit use temperature is 1300-1400°C. The production process of various grades of high alumina bricks is roughly the same as that of multi-clinker clay refractory bricks. The clinker calcined at high temperature is first coarsely crushed by a jaw crusher, then finely crushed, sieved into the required particle size, and then goes through the processes of batching, mixing, trapping, wet grinding, molding, drying, and firing. The production process of sintered mullite bricks is similar to that of high alumina refractory bricks. Synthetic mullite clinker is used as granular material,...
The aluminum content of high-alumina lightweight bricks is 50-52-56, and the density is 0.6/0.8/1.0g/cm3. According to the size and specifications, there are standard bricks and special-shaped bricks. The price is different. It is about a few yuan a piece. Please contact us for the specific price. The physical and chemical properties of lightweight high alumina bricks mainly depend on the basic components and are also closely related to the process. For general lightweight high alumina bricks, the main components are only listed. The content of Al2O3 and Fe2O3, in fact, CaO, MgO, TiO, K2O, Na2O, etc. are all molten components, which determine the content of the glass phase. The nature and quantity of the mullite crystal phase are ignored because most of its use temperatures are below 1400 °C. This product is a high-temperature insulation material. It is made from high alumina bauxite and clinker that combines raw meat with clay. At present, the foam method and burnout method are mostly used to obtain insulating brick aluminum bricks with high porosity, low bulk density, and low thermal conductivity. Its characteristic is that the lower the density, the better the thermal insulation performance. According to different products, lightweight high-alumina bricks can...
Masonry Requirements for Refractory Bricks in Rotary Kiln 1. The brick lining is reliably concentric with the barrel. 2. Grasp the construction quality of the brick lock area. 3. Minimize the amount of steel plate used. 4. Correctly handle the brick joints. 5. Brick joints should be horizontal and vertical. 6. It is strictly forbidden to use a hammer to lay bricks. Masonry method of rotary kiln 1. Ring reduction/and wrong/5 cut According to the different brick joints, the blasting method of cement rotary kiln refractory bricks is divided into two types: circular and staggered. It is better to build the cylinder with bricks and rings. The advantage of ring masonry is that it is easy to build and dismantle, but it is necessary to ensure that the brick type and the size of the brick joints meet the requirements. If the brick joints are too large, it is easy to cause dislocation and deformation of the kiln lining and even accidents such as drawing lots and falling bricks. If the brick joint is too small, the lining brick will be damaged in advance due to excessive thermal stress during use. The main disadvantages of the staggered masonry method are:...
The market of refractory materials in domestic and overseas markets is mainly affected by factors such as market demand and raw material prices. Firstly, with the continuous advancement of global industrialization and urbanization, the demand for various high-temperature industries and construction industries is also increasing, thereby promoting the development of the refractories market. In some developments, such as India, the rapid development of steel, cement, and other industries has also driven the growth of demand in the refractory market. Secondly, the price of raw materials is an important factor affecting the refractory market. The price fluctuation of some raw materials, such as bauxite, graphite, etc., will directly affect the production cost and price of refractory materials. At the same time, factors such as trade protectionism and policy risks in the international market may also have a certain impact on the export market and prices of refractory materials. In addition, with the increasing global attention to environmental protection and sustainable development, the demand for environmentally friendly and energy-saving refractory materials is also increasing, which will provide new development opportunities for the industry. To sum up, the refractory market in the international market is affected by various factors, and refractory manufacturers need...
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...
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