Can Inorganic Insulation Materials Be Used Instead of Fiber Products for Kiln Insulation?

Inorganic insulation materials can be used to replace fiber products for kiln insulation. Inorganic thermal insulation materials are a type of material with excellent thermal insulation properties in high-temperature environments. They are usually made of inorganic minerals, such as alumina, silicon oxide, magnesium oxide, etc. Compared with fiber products (such as refractory fibers), inorganic thermal insulation materials have some advantages and applicability, such as: High-Temperature Resistance: Inorganic insulation materials are generally able to withstand higher temperatures because they are composed of inorganic minerals that are resistant to high temperatures. Resistance to vibration and mechanical stress: Due to their hard nature, inorganic insulation materials have better resistance to vibration and mechanical stress and are suitable for some environments that require higher durability. Resistance to chemical corrosion: Inorganic insulation materials have good resistance to chemical corrosion and can be used in some applications involving corrosive gases or chemicals. Stability: The performance of inorganic thermal insulation materials is relatively stable under long-term high temperatures and is not prone to pyrolysis, decomposition, or reduction of thermal insulation performance. However, some issues need to be noted Weight: Inorganic insulation materials are generally dense and relatively heavy. This may affect the design of some applications. Thermal...

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How to Achieve Energy Saving and Heat Preservation in Rotary Kiln

Recommendations for high-strength thermal insulation materials: ultra-high-strength ultra-microporous thermal insulation modules. This product combines the compressive strength of heavy bricks with a body density of 2.3g/cm3 or above, and the light weight of a body density of 0.8g/cm3. Thermal conductivity of quality bricks. The cold surface temperature of large-scale rotary kilns in the cement industry is generally 280-320°C. Because there are no materials with high strength and low thermal conductivity, effective insulation cannot be achieved, resulting in a huge waste of energy. According to calculations, the use of 40-50mm thick ultra-high-strength ultra-microporous thermal insulation modules in conjunction with conventional cement kiln working layer materials can reduce the cold surface temperature of the kiln body by 100°C-130°C. A medium-sized clinker line with a daily output of 5,000 tons can save about 5,500 tons of standard coal annually. The rotary kiln in the cement industry alone can save companies 20 billion in fuel costs every year. Various types of rotary kilns are used in more than a dozen industries and can save companies hundreds of billions every year. The ultra-high-strength ultra-microporous thermal insulation module not only takes into account the compressive strength of heavy bricks with a body density of 2.3g/cm3 or...

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High-Temperature Corrosion Resistance of Chrome Corundum Bricks

Chrome corundum brick is a high-performance refractory material with good high-temperature corrosion resistance. Here are some of the key features of chrome corundum bricks: High-temperature resistance: Chrome corundum bricks can withstand very high temperatures, usually reaching more than 2000 degrees Celsius. This makes it perform well in high-temperature industrial environments, such as metallurgy, glass, cement, and other industrial fields. Corrosion resistance: Chrome corundum bricks have good resistance to chemical corrosion and acid and alkali corrosion. This allows it to maintain stable performance in the presence of some corrosive gases and chemicals. Thermal shock resistance: Chrome corundum bricks have good thermal shock resistance and can maintain structural integrity in environments with rapid temperature changes. High strength and hardness: Chrome corundum bricks have high strength and hardness, allowing them to withstand high temperatures, high pressures, and mechanical shocks. Generally speaking, chrome corundum brick is a refractory material that performs well in high-temperature and corrosive environments. It is often used in the linings, furnaces, and other parts of high-temperature industrial equipment. However, the specific performance may also vary due to manufacturing processes, material formulations, and other factors. It is recommended to understand the technical specifications and performance parameters of the specific product before...

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Requirements that Refractory Bricks for Glass Kilns Should Meet

Refractory bricks for glass kilns need to meet a series of specific requirements to ensure they can withstand high temperatures, resist corrosion, maintain stable performance, and provide reliable fire protection during the glass production process. The following are some of the main requirements that refractory bricks for glass kilns should meet: High-temperature resistance: Glass kilns often operate at very high temperatures, so the refractory bricks must be able to withstand high temperatures. This usually means they need to have a high melting point and high-temperature resistance. Corrosion resistance: Acidic and alkaline substances are involved in glass production, so refractory bricks need to be corrosion-resistant and able to resist the corrosion of the glass components on the bricks. Thermal expansion matching: Temperatures can change significantly within a glass kiln, so refractory bricks need to have a thermal expansion coefficient that matches other materials to prevent cracks and damage. Compactness: Refractory bricks should have high compactness to reduce penetration and prevent molten material from penetrating the interior of the bricks, thereby extending the service life of the bricks. Mechanical Strength: Refractory bricks require sufficient mechanical strength to withstand the pressure and mechanical stresses that may be present within the kiln. Good thermal...

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What Are the Refractory Materials Used in Aluminum Plants?

Refractory materials used in aluminum plants include refractory bricks, non-stick aluminum, anti-seepage castables, insulation materials, etc. Please see the detailed introduction below. The refractory materials used in aluminum plants are mainly to resist the effects of high temperature and corrosion to ensure the smooth progress of the aluminum smelting and casting process. The following are some common refractory materials used in aluminum plants: Refractory bricks: Refractory bricks are one of the more common refractory materials and can be used to construct furnace walls, furnace bottoms, and furnace roofs. They can withstand high temperatures and perform well in the corrosive atmosphere of aluminum. High alumina refractory bricks and silicon carbide refractory bricks are commonly used in aluminum smelting. Refractory castable: This material is commonly used inside furnaces to fill and maintain the shape of the furnace cavity. They can be constructed by pouring or pounding to ensure continuity and high-temperature resistance of the furnace cavity. Non-stick aluminum refractory castable: Aluminum alloy smelting castable is specially designed for the aluminum melting industry. Non-stick aluminum refractory castables can significantly increase the service life of aluminum alloy melting furnaces. During the aluminum smelting process, no aluminum ash is produced and no corundum is formed....

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Comparison of Durability between High Alumina Bricks and Magnesia Bricks

High alumina bricks and magnesia bricks have different advantages in different application environments and conditions, so which one is more durable depends on the specific usage. High alumina brick Good fire resistance: High alumina bricks are usually made of high-purity aluminum oxide have good fire resistance and can resist high temperature and chemical attack. Widely used in high-temperature environments: High-alumina bricks are widely used in high-temperature industrial fields such as metallurgy, glass, cement, etc. because they can withstand relatively high temperatures. High wear resistance: High alumina bricks usually have a certain resistance to some mechanical wear. Magnesia brick High refractory resistance: Compared with high alumina bricks, magnesia bricks have higher refractory resistance. Good alkali resistance: Magnesia bricks have good resistance to alkaline environments, so they are often used in alkaline industries such as glass kilns. Good thermal conductivity: Magnesia bricks have good thermal conductivity, so they also have advantages in some specific applications (such as certain steel smelting furnaces). Therefore, which brick is more durable depends on the specific industrial process and environmental conditions. High alumina bricks generally perform better in high temperatures and acidic environments, while magnesia bricks may be more suitable in alkaline environments and some special conditions....

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How to Choose Refractory Bricks That Are Resistant to Strong Alkaline Erosion?

Refractory bricks are a type of refractory material used in high-temperature environments. Different types of refractory bricks have different corrosion resistance properties in different chemical environments. If you need refractory bricks that are resistant to strong alkaline attack, here are a few types to consider: Alkali-resistant bricks: refractory clay bricks with an alumina content of 25%-28%, which allows alkali to condense on the brick surface and quickly react with the bricks to form a high-viscosity glaze layer, which blocks the alkali from continuing to the inside of the brick body. Channel of erosion, thus preventing alkali cracking. If there is a lot of chlorine in the air, the SiO2 content in the bricks can be appropriately increased to increase the ability of the brick surface to combine with chlor-alkali and stick together to make alkali-resistant clay bricks that are resistant to chlor-alkali erosion. Magnesia chrome bricks: They are made of sintered magnesia (magnesium oxide content 89%-92%) and refractory grade chromium bricks as the main raw materials, which are mixed, high-pressure formed, dried, and fired at 1550-1600 degrees. Due to the high impurity content and the silicate bonding between the refractory grains, the fired ordinary magnesia-chrome bricks are also called silicate-bonded...

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Alkali Metal Corrosion on Refractory Brick Gasifier

Alkali metals (such as sodium, potassium, etc.) can corrode refractory bricks and other refractory materials. This erosion usually involves a chemical reaction between alkali metals and refractory materials, resulting in corrosion and damage to the material. Specifically, the following is the corrosion mechanism of alkali metals on refractory bricks: Gasification of alkali metals: Alkali metals can react with oxygen in the air to form oxides. These oxides can react with the main components in refractory bricks (usually alumina, silicates, etc.) at high temperatures, causing corrosion of the refractory bricks. Penetration of Alkali Metals: Alkali metals can penetrate the structure of refractory bricks, especially at high temperatures. Once alkali metals penetrate, they may react with compounds in the brick, causing breakage and dissolution of the material. Evaporation and recondensation of alkali metals: In the gasifier, evaporation, and recondensation of alkali metals may occur, causing the alkali metals to form salts on or within the refractory bricks. These salts can also corrode the material. To reduce the corrosion of refractory bricks by alkali metals, some measures are usually required, such as using refractory materials with high alkali metal corrosion resistance, controlling temperature and atmosphere to reduce alkali metal evaporation, and regularly inspecting...

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Causes of Cracking of Refractory Materials

Refractory cracking can occur for a variety of reasons, which can vary depending on the type of material, application environment, and manufacturing process. Here are some common causes of refractory cracking: Thermal stress: Thermal stress is one of the more common causes of cracking of refractory materials. When refractory materials heat up or cool down rapidly under high-temperature conditions, the temperature changes in different parts are uneven, leading to internal stress accumulation. These stresses may lead to the formation of cracks. Thermal expansion and contraction: Refractory materials typically expand at high temperatures and then shrink as they cool. If a material’s coefficient of thermal expansion is uneven or does not match adjacent materials, it can cause the material to crack. Chemical attack: Certain chemicals react with refractory materials at high temperatures, causing erosion and corrosion of the material. This erosion can weaken the material’s structure, making it more susceptible to cracking. Thermal Shock: In some industrial processes, refractory materials may frequently experience drastic temperature changes, known as thermal shock. This rapid temperature change can cause the material to crack. Structural design: Design and construction factors may also lead to cracking of refractory materials. There is also an increased risk of...

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Strength Comparison between Silica Molybdenum Bricks and Magnesia Bricks

Which one has higher strength, silicon molybdenum brick or magnesia brick? The normal temperature compressive strength of magnesia bricks varies depending on the content, ranging from 50-70Mpa, while the strength of silica-molybdenum bricks ranges from 85-90Mpa. Silica molybdenum bricks and magnesia bricks are special brickmaking materials used in high-temperature and fire-resistant environments. They have different materials and applications. Here are their main features and differences: Material: Silica molybdenum bricks are mainly made of silicon carbide, a refractory material with a high degree of high-temperature resistance and fire resistance. Characteristics: Silica molybdenum bricks have good high-temperature resistance and can withstand very high temperatures, so they are often used in the internal masonry of high-temperature industrial furnaces, barbecue grills, electric furnaces, and other high-temperature equipment. Strength: Silica molybdenum bricks usually have relatively high compressive strength, with the normal temperature compressive strength being about 85-90 MPa. Material: Magnesia brick is mainly made of magnesium oxide, which is an alkaline refractory material. Properties: Magnesia bricks are commonly used in steelmaking furnaces, electric arc furnaces, and other metallurgical equipment because of their good performance under alkaline conditions. It also has better fire resistance but is not as high temperature resistant as silica molybdenum brick. Strength:...

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