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Refractory bricks are a type of building material designed to withstand high-temperature environments. Their ability to withstand high temperatures depends mainly on their materials and manufacturing processes. Generally speaking, the refractory temperature range of refractory bricks is quite wide, ranging from a few hundred degrees Celsius to over 1700 degrees Celsius. This mainly depends on the chemical composition, mineral composition, and microstructure of the refractory bricks. The main raw materials of refractory bricks include various refractory minerals, such as clay, high alumina, siliceous materials, magnesian materials, and other special minerals. These raw materials are made through processes such as crushing, screening, mixing, molding, and sintering. During the sintering process, the minerals in the raw materials will undergo chemical reactions to form new, more high-temperature resistant mineral structures, thus giving the refractory bricks excellent high-temperature stability. For example, the refractory temperature of clay refractory bricks is generally around 1350-1400 degrees Celsius. This type of refractory brick is mainly used in some medium and low-temperature industrial kilns. High-alumina refractory bricks, due to their high alumina content, can have a refractory temperature of 1600-1700 degrees Celsius and are suitable for industrial environments with higher temperatures, such as steelmaking furnaces and glass kilns. Silica...
Refractory materials used in steel mills are key materials to ensure the stable operation of smelting equipment such as blast furnaces and converters under harsh environments such as high temperature, chemical erosion, and mechanical wear. These materials usually have high-temperature stability, good slag resistance, thermal shock resistance, and certain mechanical strength. The following is a brief introduction to commonly used refractories in steel mills: Main types 1. Siliceous refractories: With silicon oxide as the main component, it has high refractoriness and good resistance to acidic slag erosion, and is often used in the bottom and hearth of blast furnaces. 2. Alumina silicate refractories: such as high-alumina bricks, which have excellent refractoriness and slag resistance due to their high alumina content, and are widely used in the lining of blast furnaces, hot blast furnaces, and converters. 3. Magnesia refractories: including magnesia bricks, magnesia carbon bricks, etc., have extremely high refractoriness and good resistance to alkaline slag erosion and are one of the main materials for converter linings. 4. Carbon refractory materials: such as graphite products, due to their extremely high refractoriness and good thermal conductivity, are important in high-temperature areas such as the bottom and hearth of blast furnaces. However, attention...
Corundum brick is a high-quality refractory material with excellent performance indicators. It is often used in key parts of high-temperature industrial kilns. There are many types of corundum bricks, each of which has different uses. Here are some common corundum bricks: 1. Fused corundum brick Fused corundum brick is a refractory brick made by an electric melting process. It has high refractoriness, corrosion resistance, and strength. It can have excellent stability and corrosion resistance in high-temperature environments. It is usually used in high-temperature industrial furnaces such as steel smelting. For example, in the lining of large steelmaking converters, fused corundum bricks can withstand the scouring of molten steel and high temperatures. 2. Sintered corundum brick Sintered corundum brick is a refractory brick sintered at high temperatures. It has good thermal shock resistance and mechanical strength and is more suitable for key parts of kilns. For example, in the caldron of a glass kiln, sintered corundum bricks can withstand frequent temperature changes and flame impact. 3. Chrome corundum brick Chrome corundum brick is a kind of brick with a certain amount of chromium added to the basis of corundum brick, which improves its corrosion resistance and wear resistance. It is often...
GT-13NL castable is a high-performance refractory castable mainly used in high-temperature industrial furnaces, especially those that require resistance to alkali metal oxide corrosion. The following is a detailed introduction to GT-13NL castable: 1. Composition and characteristics GT-13NL castable is made of aluminum silicate material as refractory aggregate and powder and is formulated by adding aluminate cement and appropriate amounts of admixtures. This castable has the following notable properties: Alkali corrosion resistance: It can effectively resist the erosion of alkali metal oxides (such as K₂O, Na₂O) at medium and high temperatures, protecting the internal structure of the kiln from damage. High-temperature performance: It remains stable in high-temperature environments, reacts with alkali metal oxides to generate a high-viscosity liquid phase, and forms a glaze-like protective layer further to prevent the penetration and erosion of alkali metals. High strength: It has high normal temperature compressive strength and flexural strength, and can withstand mechanical and thermal stress during the kiln operation. Good constructability: It can be constructed by adding water and stirring. Forming a uniform pouring layer is easy and has high construction efficiency. ### 2. Physical and chemical indicators According to relevant information, the physical and chemical indicators of GT-13NL castable include but...
Refractory castable construction is the key to ensuring the stability of high-temperature kilns, but during the construction of refractory castables, it needs to be mixed with water before it can be used, and the amount of water added affects the quality of the refractory castables. Not only that, the quality of water also affects the quality of construction. So how much water should be added to refractory castables? For ordinary refractory castables, the amount of water added to refractory castables accounts for 7%-8% of the total mixing amount, and some are about 9%-10%. For lightweight castables, the amount of water added is generally 30%-38%, and there are certain differences in the amount of water added between different refractory castables. It should be noted that when adding water, it is necessary to ensure that the water is clean and pure drinking water, not sewage or water containing impurities, which will affect the construction quality of refractory castables. The amount of water added affects the use of refractory castables. Too little water will lead to poor fluidity of refractory castables, fill molds, and affect construction quality and the integrity of castables; while too much water will reduce the strength and refractory performance...
Refractory castables are an indispensable refractory material for high-temperature industrial kiln masonry. Its price affects the budget of the entire project. Usually, the price of each manufacturer is different. Usually, the price of refractory castables is not fixed. Some factors affect the price of refractory castables. So what factors are the reasons for the price increase of refractory castables? 1. Raw material cost The raw materials of refractory castables generally include bauxite, magnesia, silica, etc. With the increase in the difficulty and cost of raw material mining in recent years and the continuous increase in the industry’s demand for high-quality and high-purity raw materials, the supply of raw materials is tight, which further leads to the price increase of refractory castables. 2. Impact of environmental protection policies To cope with increasingly serious environmental problems, the state has strict requirements for the mining and production of refractory materials. Enterprises need to invest a lot of money to upgrade environmental protection equipment and control pollution in enterprises, which undoubtedly increases the production costs of enterprises. At the same time, there are strict restrictions on the mining of mineral resources, resulting in a decline in the mining volume of refractory materials and a...
Heavy oil gasifiers are equipment that converts heavy petroleum products (such as heavy oil, residual oil, tar, etc.) into synthesis gas (mainly carbon monoxide and hydrogen) through a high-temperature and pressure gasification process. The reason why high-purity corundum bricks are used for their hot bricks is mainly because their working environment is relatively harsh, and it is often in a high-temperature, high-pressure, corrosive, and wear-resistant working environment. To withstand such a working environment, it is necessary to select high-temperature, corrosion-resistant, and wear-resistant refractory materials. High-purity corundum bricks are high-quality refractory bricks. Its alumina content can reach more than 90%, with excellent high-temperature resistance, and the refractory temperature can reach more than 1800℃. At the same time, it has a high room temperature compressive strength, and the compressive strength can reach more than 100Mpa, which can withstand the high-pressure environment of heavy oil gasifiers. High-purity corundum bricks have a very high load softening start temperature, which can ensure the stability of the heavy oil gasifier. In addition, high-purity corundum bricks also have good corrosion resistance and wear resistance. These characteristics are essential conditions for ensuring the normal operation of the heavy oil gasifier. The selection and arrangement of hot face bricks...
Refractory brick is a shaped material used in high-temperature industrial kilns. It is mainly used for masonry furnace walls of high-temperature kilns. At present, refractory bricks are primarily divided into silicon-aluminum refractory bricks, alkaline refractory bricks, carbon-containing refractory bricks, chromium-containing refractory diamonds, zirconium-containing refractory bricks, magnesium-containing refractory bricks, etc., according to the composition. The types are very rich. At the same time, refractory bricks can be divided into standard refractory bricks, ordinary refractory bricks, and specific refractory bricks according to their shape. Therefore, refractory bricks can be made into refractory materials of different materials and sizes to meet the different needs of high-temperature industrial kilns. The physical and chemical indicators of refractory bricks are also very diverse. They are used to meet different working media. The refractory temperature is generally between 1350℃ and 1790℃. The refractory temperature of some refractory bricks with high-quality ingredients can reach about 2000℃. Not only that, refractory bricks also have a series of characteristics such as corrosion resistance, creep resistance, and thermal shock resistance. They can maintain stability under high-temperature environments and provide a stable working environment for kilns. Since refractory bricks are divided into different brands and types when we choose refractory bricks, we...
The construction of refractory castables should be carried out strictly by the construction specifications to ensure the construction quality and progress. During the construction period, the refractory materials should be kept in a ventilated and dry place. During summer construction, the refractory castables should be placed in a cool and dry place, and outdoor exposure is prohibited. The following is the construction process of refractory castables: 1. Before construction, the construction equipment and construction site should be cleaned. No mud, sand, lime, silicate cement, or other debris should be mixed into the castables, and all tools and equipment in contact with the castables should not be sticky with the above substances. 2. The mixing of castables should use a forced mixer, and the mixing water must be clean water with a pH value between 6-8 and a dosage of 7-8%. It is strictly forbidden to mix castables of different brands or manufacturers until the materials are uniform. 3. When mixing, pour all the materials in the bag (including the main material and small bags of auxiliary materials) into the mixer. No residue can be left, and no part can be taken out for use. First dry mix for 2-3 minutes,...
After pouring the refractory castable, you need to wait until the entire castable is poured before you can carry out normal furnace baking operations. So how long does it take to bake the furnace after the castable is finished? Generally speaking, after pouring the refractory castable, it takes 24 hours for the castable to harden before demolding, and then natural curing, which takes about 3 days to bake the furnace, to avoid the refractory castable from falling off or bursting during the furnace baking process due to inadequate hardening. The pouring quality of the refractory castable and the time of the middle road activation are directly related to the use effect and life of the furnace, so before the early production, this process must be there, and it takes a long time. In addition to natural solidification, furnace baking also takes a lot of time, and it must be carried out strictly by regulations, to ensure the quality of the refractory castable and the stability of the kiln after production. We all know that a refractory castable furnace is very important for refractory castable. For kiln, baking affects the service life of the kiln. If the furnace is not baked...
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