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When comparing the density of high alumina cement and aggregate, we need to clarify the physical properties of the two and their respective density ranges. 1. Density of high alumina cement The density of high alumina cement, also known as high alumina cement, is a basic physical parameter of cement materials. According to information from different sources, the density of high alumina cement is usually between 2.9~3.0g/cm³, which is similar to the density of common cement types such as Portland cement. High alumina cement is widely used in construction and industry due to its excellent fire resistance, corrosion resistance, and fast setting time. 2. Density of aggregate Aggregate, as an important component of concrete, has an important influence on the performance of concrete. The density of aggregate varies according to its type and characteristics. Generally speaking, aggregate can be divided into ordinary aggregate, light aggregate, and heavy aggregate. The density of ordinary aggregate is roughly 2500~2700kg/m³; the density of light aggregate is lower, usually between 0~1000kg/m³, such as ceramsite, expanded perlite, etc.; while the density of heavy aggregate is higher, which may reach 3500~4000kg/m³, such as iron ore, barite, etc. 3. Density comparison From the absolute value point of view,...
There are many reasons why corundum refractory castable is so expensive. Usually, its price is 2-3 times higher than that of ordinary high-alumina bricks. So what are the reasons for its high price? Today, the editor will give a brief introduction: 1. High cost of raw materials The raw material of corundum refractory castable is mainly corundum. Corundum is a high-purity, high-quality refractory mineral. Its mining and purification process is relatively complicated. Not only that, the alumina content in corundum bricks generally needs to reach more than 90%, which requires the purity of corundum to be high enough to meet this standard. At present, my country’s corundum storage resources are relatively small, and the mineral content in the ore is relatively low. At present, artificial corundum is still the main one used on the market, so the cost of corundum raw materials remains high. 2. Complex production process The production process of corundum refractory castables is relatively complex and generally has high requirements for the process. Only in this way can the standard of more than 90% content be met, and the proportion of corundum refractory castables also needs to be very precise, so producers need to invest a lot...
In the process of building kilns in the high-temperature industrial field, to meet the needs of various complex industrial kiln lining structures, special-shaped refractory bricks are very important. They can be selected according to the specific shape of the kiln lining, and are often used in the masonry of some special-shaped kilns such as round and arched ones. Common special-shaped refractory bricks 1. Arch foot bricks Arch foot bricks are a kind of trapezoidal refractory bricks, mainly used in the corners of the vaults of industrial furnaces, bearing high temperatures and structural stresses. They are widely used in the blast furnace vaults of steel plants to ensure the stability and sealing of the furnace roof structure. 2. Knife-shaped bricks Knife-shaped bricks are a kind of refractory bricks with a wide top and narrow bottom. They are shaped like a kitchen knife, so they are called knife-shaped bricks. They are mostly used in special-shaped furnace doors, observation holes, and other parts. Around the furnace door of the heat treatment furnace, knife-shaped bricks can effectively prevent heat leakage. 3. Anchor bricks Anchor bricks usually have anchor claws or holes, which can be firmly connected to the furnace shell or steel structure. They...
The use of refractory castables affects the quality of the entire project. If it is not used in a standardized manner, it is easy to cause problems in the project, thus affecting the commissioning and use. So how should the castables be used, and what should be paid attention to? 1. Preparation: Before construction, all construction tools and areas should be cleaned to avoid the performance degradation of refractory castables due to impurities. If necessary, the foundation or support should be repaired and reinforced first. 2. Mixing refractory castables: When mixing refractory castables, a forced mixer should be used for stirring. When adding water, clean water with clean water quality should be used. Sewage and water containing harmful impurities should not be used. The amount of water added should be strictly added according to the manufacturer’s requirements. When mixing, first pour the dry material and additives into the mixer, dry mix for 2-3 minutes, then add water until the material is evenly mixed before discharging, and the mixed refractory castable should be used within 30 minutes. 3. Pretreatment of pouring: Before pouring, butter or engine oil should be applied to the pouring surface of the casting mold to facilitate demoulding....
Refractory bricks are also called fire bricks. They are a kind of shaped refractory material that is indispensable in high-temperature environments. They have the characteristics of high-temperature resistance, creep resistance, earthquake resistance, and corrosion resistance. They can resist high-temperature erosion and medium corrosion, so they are often used for the lining of high-temperature equipment and furnaces, such as aluminum melting furnaces, blast furnaces, trolley furnaces, glass kilns, etc. They are widely used in metallurgy, construction, chemical industry, power, and other industries. The reason why refractory bricks are also called fire bricks is because they have very high refractoriness. The refractory temperature of some common refractory bricks can reach 1790℃, and the refractory temperature of some high-quality refractory bricks can even reach about 2000℃, such magnesium bricks and corundum bricks. It is precisely because of its excellent refractory temperature that it is widely used in high-temperature industries to ensure the stability of the working environment of smelting furnaces in high-temperature industries and to provide stable assistance for the development of high-temperature industries. At the same time, its development is also the key to restricting the development of high-temperature industries. The higher the refractory temperature, the higher the melting point of high-temperature...
Phosphate refractory bricks are a type of refractory material, mainly composed of phosphate compounds and high-temperature resistant materials. They are widely used in some high-temperature and acid-base corrosive occasions. At present, phosphate refractory bricks mainly include phosphate-bonded high-alumina bricks and phosphate-bonded high-alumina wear-resistant bricks. The phosphoric acid solution in the manufacturing process is about 42.5%-50%, and the alumina content of phosphate refractory bricks is generally 75%-77%. It has excellent high-temperature resistance and corrosion resistance. The refractory temperature of phosphate refractory bricks can generally reach 1250℃-1350℃, which can withstand the high-temperature environment in the kiln. At the same time, it also has very good corrosion resistance, so it is often used in some environments with corrosive media to ensure the stability and service life of the kiln. Not only that, phosphate-bonded high-alumina refractory bricks show good thermal shock resistance. This means that they can withstand rapid temperature changes without cracking or peeling. This feature is essential for applications with frequent thermal cycles (such as furnaces or kilns). Not only that, it also has good wear resistance and can withstand abrasive forces and mechanical wear, which makes it very suitable for applications where bricks face high wear. Since phosphate refractory bricks improve...
T38 refractory brick is a common refractory brick size, which is often mentioned by people. It is also called knife-shaped brick or big knife brick. T38 represents the size of refractory brick, which is 230*114*65/55 (mm). This brick is thick on the top and thin on the bottom like T20 refractory brick. It looks like a knife from the side, so it is called a knife-shaped brick. It is often used for the masonry of the arched part of the kiln. The reason why T38 refractory brick is designed to be thick on the top and thin on the bottom is mainly to meet the needs of arc-shaped kiln masonry. This can meet the diversity of kiln shapes. After masonry, the refractory bricks can be more closely laid, making the kiln more closed and effectively resisting high-temperature erosion and pressure. It is usually used in combination with T20 refractory bricks to make the masonry of arc-shaped or circular kiln parts more convenient. At present, the materials of T38 refractory bricks mainly include high alumina, clay, magnesium, silicon carbide, corundum, and other materials. Reasonable selection should be made according to the actual situation of the kiln, such as the operating temperature...
Refractory brick T20 is a refractory brick of a specific specification, where T20 represents the brick number of the refractory brick, also known as knife-shaped brick or small knife edge. Its size is 230*114*65/45 (mm). The shape of this brick is characterized by its thickness, which is wide at the upper end and narrow at the lower end. It is often used for the masonry of the arched part of the kiln. The size of T20 refractory bricks is generally carefully designed so that when the kiln is built, it can meet the masonry of arched or circular parts, such as chimneys, craters, etc. The reason for designing such a size is that in addition to making the construction simple, it can also make the refractory bricks fit more closely, forming a solid structure, and effectively resisting high-temperature erosion and pressure. This is also the refractory brick model we commonly use in masonry arched parts. At present, the materials of T20 refractory bricks mainly include high alumina, clay, corundum, etc. They can also be made into carbon-containing refractory bricks, zirconium-containing refractory bricks, and other different materials to meet the use requirements of different industrial kilns. In the selection process, we...
Secondary high alumina is a refractory brick with an alumina content of about 65%. The weight of a single brick is generally around 3.9-4.1kg, its volume density is 2.4g/cm3, and the refractory temperature is generally 1770℃. What is the price of such a refractory brick? For a standard secondary high alumina brick with a size of 230*114*65mm, the price is generally RMB 10-15 per piece. Of course, the specific price also depends on many factors, including size, alumina content, brand, and quality. Size and alumina content are one of the main factors affecting secondary high alumina bricks. There are many types of secondary high-alumina bricks, such as large blade, small blade, two-piece, four-piece, etc. According to the different sizes, they are divided into different types of secondary high-alumina bricks, so their prices also vary according to the size and alumina content. For example, the price of a smaller two-piece is generally around RMB 7-8 per piece, while the price of a larger T56 secondary high-alumina brick may reach RMB 30-40 per piece, so when we buy, we must determine the size and alumina content of the refractory bricks. In addition to size and alumina content, brand and quality are also...
Refractory castables are a kind of high-temperature refractory materials, which are usually used for the lining construction of various high-temperature industrial kilns. They are widely used in the kiln production of metallurgy, steel, glass, cement, chemical industry, and other industries. So what are the general uses of refractory castables in these industries? In the metallurgical industry, refractory castables are often used for the lining masonry of high-temperature kilns such as aluminum melting furnaces, combustion furnaces, electric furnaces, and self-heating roads. They are usually used for the masonry of furnace bottoms, furnace walls, and other parts to resist the erosion of high temperatures to kilns. In the steel industry, refractory castables are often used for the lining masonry of high-temperature kilns such as blast furnaces, heating furnaces, coke ovens, and converters to resist the erosion of high-temperature molten steel, molten iron, and other high-temperature molten liquids. In the glass industry, refractory castables are often used for the lining of melting furnaces and the clarification and homogenization parts of glass liquid. They can withstand the erosion of high temperatures and glass liquid to ensure the quality of glass liquid and more uniform melting. In the cement industry, refractory castables are often used...
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