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Concrete is an important building material, and there are many types of it. As two of them, heat-resistant concrete and ordinary concrete are both building materials, but there are great differences in their uses and characteristics. Today, I will briefly introduce the difference between the two. 1. Different composition The composition of heat-resistant concrete mainly includes heat-resistant gelling materials, heat-resistant aggregates, and refractory cement, which is highly resistant to high temperatures. Ordinary concrete is generally made of cement, coarse aggregate (crushed stone or pebbles), fine aggregate (sand), admixtures, etc. The composition of the raw materials between the two is very different. The raw materials of heat-resistant concrete have certain fire resistance, while ordinary concrete does not. 2. Different characteristics Heat-resistant concrete can be used stably at high temperatures of 200-1300℃. For some high-quality heat-resistant concrete, the heat-resistant temperature can reach 1500℃, and the volume density is 2.1-2.15g/cm3. In addition, it has high strength and wear resistance during use. The compressive strength of heat-resistant concrete is generally 10-40MPa, and the high-temperature strength is 3.5MPa-20MPa, so it can maintain high strength even at high temperatures. Ordinary concrete does not have a very high heat resistance temperature. Usually, after it exceeds 300℃, its...
The heat storage balls in melting furnaces play a vital role in the melting process, and their role is mainly reflected in the following aspects: 1. Heat storage and reuse As a key component in the melting furnace, the main function of the heat storage ball is to absorb and store the heat released by high-temperature gas or liquid. This heat can then be released when needed to preheat the air or fuel entering the melting furnace, thereby improving the utilization rate of thermal energy. This heat storage and reuse mechanism helps to reduce energy consumption and improve melting efficiency. 2. Optimize the melting environment Since the heat storage ball can absorb high-temperature heat, it also helps to stabilize the temperature field in the melting furnace and reduce the impact of temperature fluctuations on the melting process. A stable melting environment helps to improve the quality of the smelting product and reduce the defective rate. In addition, the heat storage ball can also reduce the exhaust gas emissions generated during the melting process to a certain extent and improve environmental protection performance. 3. Enhance heat exchange efficiency The heat storage ball is usually made of high-temperature and corrosion-resistant refractory materials,...
Anti-permeability castables are mainly used in various industrial and civil building structures that require high strength, high wear resistance, and high anti-permeability performance. This material plays an irreplaceable role in many fields due to its unique anti-permeability performance. First of all, in the field of industrial production, anti-permeability castables are widely used in equipment foundations and structures in metallurgy, chemical industries, building materials, and other industries. For example, in the foundation parts of key equipment such as blast furnaces, hot blast furnaces, and converters in the metallurgical industry, because they need to withstand high temperatures, heavy loads, and complex chemical reaction environments, castables with high anti-permeability, high strength, and high stability must be used to ensure the safe operation of the equipment. Similarly, in the chemical industry, the bottoms and connecting parts of various storage tanks, reactors, and other containers also need to use anti-permeability castables to prevent the penetration and corrosion of chemical media and ensure the continuity and safety of the production process. Secondly, in the field of civil construction, anti-permeability castables also play an important role. Especially in humid environments such as basements, toilets, and pools, traditional building materials often find it difficult to meet the requirements...
Steel fiber reinforced corundum and high-alumina refractory castables for rotary kiln mouths are prone to cracking and peeling after many years of use, that is, poor thermal shock resistance and low service life. It is well known that clay bricks are better than high-alumina bricks in thermal shock resistance and alkali resistance because of low aluminum content; high strength, good wear resistance, and poor shock resistance. In the castables for kiln mouths, the Al2O3 content is 50% to 70%, the strength is moderate (taking into account both wear resistance and suitable thermal shock resistance), and the drying and compressive strength (1100℃) are about 40MPa and 70MPa respectively. It should be pointed out that refractory castables are composed of aggregates, powders, binders, and admixtures (substances). The phase composition in the matrix is in a non-equilibrium state before use. When used under high temperatures, the components in the matrix will follow the phase equilibrium relationship to re-form a new phase equilibrium (that is, obtain excellent performance and in-situ reaction). Therefore, suitable component materials should be selected and the batch design should be optimized to achieve good sinterability, volume stability, corrosion resistance, and high-temperature mechanical properties. Selection of main materials The front kiln...
As a high-performance refractory material, chrome corundum bricks are mainly used in industrial fields that need to withstand high temperatures, high pressures, and corrosive environments. Their excellent fire resistance, flexural strength, high-temperature creep, high-temperature volume stability, and corrosion resistance make them a key component in many industrial furnaces. The following are the main areas of application of chrome corundum bricks: 1. Metallurgical industry Steel smelting: Chromium corundum bricks are widely used in rolling heating furnaces in the steel industry, especially in parts prone to wear such as slide rails, tapping channels, and grooves. Its high wear resistance and long life (up to 10 to 18 months) significantly reduce refractory materials’ consumption and maintenance costs and increase the furnace’s overall life and output value. Non-ferrous metal smelting: In the process of non-ferrous metal smelting, chrome corundum bricks are used as linings for copper smelting furnaces, zinc smelting electric furnaces, and other equipment due to their superior wear resistance and corrosion resistance, effectively resisting high-temperature melts and corrosion—the erosion of sexual atmosphere. 2. Petrochemical industry Chrome corundum bricks also have important applications in gasifi ers in the petrochemical industry. These gasification furnaces have been exposed to high temperatures (1350~1450℃), high pressures (3.1~8.53MPa),...
There are significant differences between alkali-resistant castables and high-aluminum castables in many aspects. These differences are mainly reflected in composition, performance, use, and structural characteristics. 1. Differences in ingredients Alkali-resistant castable: The main components are MgO, MgO-Al2O3, MgO-CaO, MgO-CaO-SiO2, etc. These ingredients give the alkali-resistant castable excellent alkaline corrosion resistance. High aluminum castable: The main component is Al2O3, and the high alumina content makes it perform well in high-temperature environments. 2. Performance characteristics Alkali-resistant castable: It has high strength, alkali resistance, and excellent corrosion resistance. It can withstand the erosion of various slag materials, such as slurry, molten slag, limestone, etc., without causing erosion. At the same time, alkali-resistant castables also have good alkali-resistant aggregate reaction properties, thermal shock stability, wear resistance, and air permeability. High-aluminum castables: famous for their excellent high-temperature resistance, thermal shock resistance, chemical erosion resistance, and load resistance. At high temperatures, high-aluminum castables will not expand, crack or soften, and can withstand changes such as alternating hot and cold, rapid heating, and rapid cooling. In addition, its structure is dense, able to withstand various loads and vibrations, and is not prone to problems such as cracks and collapse. 3. Different uses Alkali-resistant castables: widely used in...
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....
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