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The price of castables has always been a topic that customers are more concerned about, and the prices online are all kinds of strange, which makes customers very confused. However, there are many types of castables, and each castable has different raw material ratios, different performance indicators, and raw materials. Cost and other factors are the main factors affecting the price of castables, so the price of castables fluctuates greatly. Castables can be divided into major categories such as corundum castables, non-stick aluminum castables, light acid-resistant castables, high-aluminum castables, silicon carbide castables, etc. There are dozens of major categories alone. There are many categories and models. Each castable has different uses, different proportions, and different performance indicators, so the price is difficult to determine. Generally speaking, the price range of castables ranges from 1,000 yuan to 15,000 yuan per ton. etc., so the specific price must be determined based on the specific needs and the fire resistance of the product before quoting. In the process of understanding the price of castables, we must first understand the main factors that affect castables, including raw material costs, transportation costs, performance indicators, construction environment, etc. The quotation staff will mainly based on your...
Silicon carbide brick is a high-grade refractory material. It is mainly made of silicon carbide as raw material, added with a binder (or without a binder), and is made through batching, mixing, molding, and firing. The refractory temperature can reach 1920°C, due to its excellent high-temperature performance and chemical stability, it is widely used in various industrial kilns and high-temperature kilns, such as ceramic high-temperature kilns, glass kilns, metallurgical kilns, chemical kilns, etc. In ceramic high-temperature kilns, silicon carbide bricks are mainly used for the construction of ceramic high-temperature kiln linings. The high-temperature properties and chemical stability of silicon carbide bricks can meet the high-temperature needs and corrosion resistance needs during the ceramic firing process. At the same time, the carbonization of the low volume density of silica bricks helps reduce the weight and volume of the kiln and reduces construction and operating costs. In glass furnaces, silicon carbide bricks are often used in more important parts, such as the lower part of the furnace body, waist, and belly of large and medium-sized blast furnaces. They can withstand the high temperatures during the glass firing process and the corrosiveness of the glass melt. Improve the quality and yield of glass...
The commonly used refractory bricks in hot blast stoves mainly include silica bricks, high alumina bricks, clay bricks, mullite bricks, etc. Each hot blast stove may be different depending on the use. However, the main selection of refractory materials for hot blast stoves it is determined by the hot air temperature of the hot blast furnace. Generally, when the air temperature is less than 900°C, clay bricks are often used. When the air temperature is between 900 and 1100°C, the furnace lining and checker bricks in the high-temperature part are made of high alumina bricks and molybdenum bricks. Laminated bricks or sillimanite bricks; when the wind temperature is higher than 1100°C, high alumina bricks, mullite bricks, and silica bricks are generally used as furnace lining or grid bricks. But the overall difference is not bad. Today we focus on high alumina bricks for hot blast furnaces. High alumina bricks in hot blast stoves are often used in checkered bricks on the upper part of hot blast stoves, rotating bricks on vaults, and large walls, that is, in high-temperature parts of hot blast stoves. Our commonly used high alumina bricks generally include first-level high alumina bricks, second-level high alumina bricks, and...
The thermal vibration resistance characteristics of refractory castable materials refer to the raw material’s ability to withstand ultra-low temperature conditions after being subjected to high temperatures for an instant. It refers to the evaluation of the main index value of the damage resistance of the raw material when it withstands large temperature changes. For each test the closer the distance between values, the higher the accuracy. Conversely, the lower the accuracy, the lower the ability to resist damage. It has been called thermal stability, thermal shock stability, thermal shock resistance, temperature sudden change resistance, rapid cooling and heating resistance, etc. 1. Under the equipment conditions, plus zirconium corundum raw materials, zirconium corundum is an artificial raw material with high wear resistance and heat resistance, high strength, symmetrical expansion, high load softening point, good thermal shock reliability, and high-temperature stress relaxation value. Small, good resistance to organic chemical corrosion and other characteristics. 2. Utilize the difference in linear expansion index between stone and cultivation matrix to balance the thermal vibration properties of refractory castables, reduce the thermal expansion rate of raw materials, try to use materials with lower thermal expansion rates, and increase large stones + low-expansion cultivation matrix to form...
Wear-resistant castables are subject to collision, erosion, and wear by high-concentration particles at high temperatures, and different situations will occur, especially large-scale collapse, cracks, and cracking of existing wear-resistant castables. Problems during the use of wear-resistant castables 1. The expansion coefficient of wear-resistant and refractory castables is different from that of steel, and its expansion and contraction cannot be synchronized with external steel. When the expansion joints reserved for wear-resistant castables cannot compensate for the expansion of the boiler, the extrusion between the wear-resistant materials will collapse. 2. The internal anchors of the wear-resistant castable are made of heat-resistant steel, which has poor temperature resistance. It will be carbonized and fractured in high-temperature flue gas for a long time, resulting in large-scale collapse of the wear-resistant material: the quality of the construction furnace is poor, and the wear-resistant castable contains high water content, which will cause ignition. Then it is converted into water vapor. When the steam pressure exceeds the tensile strength of the wear-resistant castable, it will cause the lining layer to explode, causing the furnace wall to collapse after ignition: The collapse factors of the wear-resistant castable are related to the thermal shock stability of the material, and...
The service life of refractory castables is affected by many factors. In addition to strictly following the construction standards during construction, curing, and baking after construction is completed is also very important. Good early maintenance is essential to extend the service life. Today, the editor will take you to understand how to extend the service life of refractory castables from seven aspects. 1. Maintenance of refractory castables Maintenance is one of the important factors affecting the performance and service life of castables, and it is also one of the reasons that is easily overlooked. Maintenance is to provide sufficient initial strength to the binder in the castable to obtain sufficient initial strength. The maintenance time is related to the type of binder of the castable. It can be said that maintenance can give the bonding agent time to solidify and harden to obtain sufficient initial strength. 2. Baking refractory castables Baking is to eliminate excess moisture, maintain and bake according to standards, promote the sintering process at high temperatures, and further improve the physical properties of the cast body. Therefore, refractory castable materials must be baked before use. The baking should meet the baking system to ensure that the free...
1. Inspection before construction Pre-construction inspections should be carried out strictly, including the following: 1.1 Clarify the appearance and structure of the castable equipment and clean it; 1.2 Setting of process holes; 1.3 The integrity of construction machinery and tools, vibrating tools, etc. must be in good condition; 1.4 Anchor type, size, layout, and welding quality, metal anchors must be compensated for expansion; 1.5 Preventive measures should be taken to prevent water (glue) loss of castables in the surrounding refractory brick insulation layer; 1.6 Packaging and factory date of castables, and conduct pre-tests to check for failure; 1.7 The quality of construction water must reach the quality of drinking water; 1.8 Implementation of construction process formula; 1.9 Pouring procedure. If the above inspection fails, construction can only be carried out after passing the inspection. Expired materials shall not be used. 2. Formwork for construction It can be made of steel plate or hardwood board (bamboo board). The formwork must have sufficient strength, good rigidity, no deformation, no displacement, and no leakage of slurry. Use mold remover for steel formwork and paint waterproof paint for wooden formwork. Reused wooden boards should be cleaned before use. 3. Castable lining construction 3.1 Mixing...
The rotary kiln is divided into a discharge end, a cooling zone, a firing zone, and a preheating zone from the kiln head end. The temperature in each section of the kiln ranges from 1000°C to 1350°C, and the requirements for refractory materials are also different. Refractory materials not only withstand high-temperature impact, but also withstand material corrosion, wear, and stress generated by kiln rotation. Therefore, there are strict requirements not only for the physical and chemical indicators of refractory materials. 1. Rotary kiln discharge port and cooling zone Demand: Due to the joint action of high-temperature clinker, secondary air, and high-temperature flame, strong mechanical wear and chemical erosion are caused. Therefore, it is required to have good wear resistance, slag resistance, and thermal shock resistance. Selection: Generally, first-grade high alumina bricks, thermal shock-resistant high alumina bricks, spinel bricks, chrome magnesia bricks, phosphate bricks, etc. are used as high alumina bricks, Refractory concrete (corundum aggregate), and silicon carbide bricks. 2. Rotary kiln firing zone Purpose: The refractory layer fired in the rotary kiln is mainly subject to high-temperature impact and chemical corrosion (alkali corrosion). Therefore, magnesia bricks and chrome magnesia bricks should be selected as high-temperature refractory materials that are...
During the construction of a high-temperature kiln, different types of refractory bricks are used in various parts of the kiln. Generally, refractory bricks are needed in the production parts of high-temperature kilns, which can withstand constant erosion and high temperatures. Some less important parts generally use insulation bricks, which are mainly responsible for preserving the temperature in the furnace, but what is the difference between the two? The difference between physical and chemical indicators 1. The thermal conductivity of insulation bricks is generally 0.2-0.4 W/(m·K), while the thermal conductivity of refractory bricks is above 1.0 W/(m·K). The thermal insulation function of insulation bricks is better than that of refractory bricks. 2. The refractory temperature of insulation bricks is generally below 1400 degrees Celsius, while the refractory temperature of refractory bricks is above it, sometimes reaching about 1700-1800 degrees Celsius. 3. The density of insulation bricks is 0.8-1.0g/cm3, while the density of refractory bricks is above 2.0g/cm3 Different usage locations Insulation bricks are mainly used to preserve the temperature of high-temperature kilns and are generally used in the insulation layer of furnace roofs and furnace walls. Refractory bricks are generally used in thermal boilers, glass kilns, cement kilns, fertilizer gas furnaces,...
Refractory mud is the joint material for connecting refractory bricks, so ensuring the adhesion of refractory cement is the key during the construction process. Today I will take you to understand the precautions in refractory mud masonry. 1. Control the water consumption of refractory cement During the use of refractory mud, the water consumption must be strictly controlled. If too much water is added, the water slurry will separate. If too little water is added, uneven mixing of the raw materials may occur, which will lead to the inability to carry out construction on site. 2. Control the construction environment temperature During the use of refractory mud, the temperature of the construction environment must be controlled. When the temperature exceeds 35°C, the refractory mud solidifies too quickly, causing the refractory bricks to harden without time to put the refractory mud between the bricks. If the construction is carried out in winter when the temperature is lower than 5℃, the refractory mud will not have enough viscosity, and construction will not be possible. In this case, it is necessary to add CMC or other binders or find ways to improve the construction. The temperature on site allowed construction to proceed normally....
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