Kiln Insulation and Energy Saving, How To Choose Insulation Bricks?

Choosing appropriate insulation bricks is an important step to improve the insulation effect of the kiln and achieve energy savings. Here are some suggestions: Thermal conductivity: The lower the thermal conductivity of the insulation bricks, the better the insulation performance. Therefore, materials with lower thermal conductivity should be selected. Common insulation brick materials include expanded vermiculite, expanded perlite, aluminum silicate fiberboard, etc. Density: The density of insulation bricks is also an important consideration. Typically, the lower the density, the lighter the brick and the better its insulation properties. However, it should be noted that too low density may lead to a decrease in strength, and a balance needs to be struck between thermal insulation performance and mechanical strength. High-Temperature Resistance: High temperatures are often reached inside the kiln, so it is important to choose insulation materials that can withstand high temperatures. Materials such as aluminum silicate fiberboard and expanded vermiculite perform well at high temperatures. Corrosion resistance: If there are corrosive gases or liquids such as acid and alkali in the kiln, choose insulation materials with good corrosion resistance to extend the service life of the insulation bricks. Size and shape: Insulation bricks should be sized and shaped to accommodate...

Learn More

What are the Refractory Bricks with a Charge Softness Above 1700 Degrees?

If you need to use refractory materials in high-temperature environments above 1700 degrees, you may want to consider these products, such as corundum mullite bricks, corundum bricks, zirconia bricks, high chromium bricks, etc. These materials have higher high-temperature resistance performance. Corundum mullite bricks Ingredients: Mainly composed of mullite and alumina. Characteristics: High compressive strength, high thermal stability, and good slag resistance. Application: Suitable for furnaces, heat treatment equipment, and other refractory structures at high temperatures. Corundum bricks Ingredients: The main ingredient is alumina (corundum). Characteristics: Very high hardness and fire resistance, suitable for high temperature, high pressure, and corrosive gas environments. Application: Commonly used in high-temperature industrial equipment such as glass kilns, electrolyzers, and metallurgical furnaces. Zirconia brick Ingredients: Mainly composed of zirconia. Features: Excellent high-temperature resistance, corrosion resistance, and thermal shock stability. Application: Suitable for metal smelting, electrolytic cells, high-temperature heat treatment equipment, etc. High chrome bricks Ingredients: The main ingredients are chromium oxide and ferrochromium alloy. Characteristics: Strong corrosion resistance, suitable for acidic and alkaline environments, and good fire resistance. Application: Commonly used in metallurgy, chemical industry, glass, and other industrial fields, especially in acidic environments. The load resistance of these materials is above 1700 degrees, and the...

Learn More

Mullite Poly Light Insulation Brick JM30 used in Tunnel Kiln

Mullite poly-lightweight insulation brick JM30 is an insulation material made of mullite as the main raw material and made through high-temperature sintering. This material has the characteristics of lightweight, low thermal conductivity, and high-temperature resistance. It is often used as the insulation layer of high-temperature industrial furnaces such as tunnel kilns. In tunnel kilns, JM30 insulation bricks may be used in the following locations: Insulation layer for furnace top and furnace wall: In the furnace roof and furnace wall parts of the tunnel kiln, JM30 insulation bricks can be used as insulation materials to help reduce heat loss and improve energy utilization efficiency. Insulation layer inside the kiln tunnel: To reduce heat loss inside the tunnel kiln, JM30 insulation bricks can also be used as the insulation layer in the kiln tunnel to help maintain high-temperature combustion conditions. Insulation of other high-temperature areas: There may be other high-temperature areas in the tunnel kiln, such as drying areas, preheating areas, etc., and JM30 insulation bricks may also be used as insulation materials in these areas. It should be noted that JM30 insulation brick is a lightweight insulation material. Its main feature is excellent insulation performance, but it is relatively weak in...

Learn More

What Kind of Refractory Bricks are Used for Chimney Maintenance?

For chimney maintenance, if the working temperature is between 700-800 degrees, you can choose medium-temperature refractory bricks or medium-temperature refractory castables. These materials are stable in medium-temperature environments and have good heat resistance. The main function of the chimney is to remove the waste smoke from the kiln, and it also plays a role in organizing the flame combustion in the furnace. When the temperature of the waste gas entering the chimney is high, the inner wall is usually built with a working layer of clay refractory bricks. If the flue gas is acidic, acid refractory bricks are built, and lightweight refractory castables are also used. Here are some suggestions for using refractory materials for chimney maintenance: Refractory bricks: Refractory bricks are usually made of materials with moderate aluminum content and have certain high-temperature resistance and corrosion resistance. This type of refractory brick provides good performance under medium temperature conditions and is a common choice for chimney maintenance, such as clay refractory bricks, high-temperature acid-resistant bricks, etc. Medium-temperature refractory castable: Medium-temperature refractory castable is a refractory material that can be poured or sprayed, usually composed of aluminum- or silicon-containing granular materials. It is suitable for surface repair and protection in...

Learn More

How to Distinguish the Quality of High Alumina Bricks

The quality of high alumina bricks is mainly distinguished by their appearance, physical and chemical indicators, sound, weight, etc. This is what we need to consider when purchasing high alumina bricks. Next, the editor will help you to understand. 1. Appearance The surface of high-alumina bricks is smooth to the naked eye, beige in color, flat on all sides, with no corner cracks, and few black spots. The color will vary depending on the alumina content. The higher the alumina content, the color will be whiter. The black spots on the surface of high alumina bricks are mainly formed during the calcining process of iron oxide. If the black spots appear in a large area, it indicates that the iron oxide content of the brick is too high, which indicates that there is a problem with its proportion. , will affect the service life of the brick. 2. Sound When two bricks are struck, the sound of high-quality high-alumina bricks will be crisp and not dull. 3. Weight According to the weight specification, the general weight of first-grade high alumina bricks is about 4.4 kg, the weight of second-grade high alumina bricks is about 4.0 kg, the weight of third-grade...

Learn More

How to Transport and Store Refractory Materials

Transportation of refractory materials and refractory products All refractory materials and refractory products must have factory certificates that meet the design technical conditions. One month before furnace construction, copy the factory test reports of all refractory materials and submit them to the metallurgical furnace major of the design institute or the working group of the design institute on the construction site. Before the product leaves the factory, it should be accompanied by a quality certificate, indicating the product name, brand, inspection results, and factory list (brick number, quantity, factory date, and train number). The shipment and use of refractory materials without product certificates are strictly prohibited. The means of transporting refractory materials and refractory products (trains, cars, ships, etc.) must be cleaned before shipment and must not be contaminated by oil or other impurities. Refractory materials must be protected from rain and snow during transportation to prevent rain and rainwater from entering. Various clay bricks, high alumina bricks, lightweight bricks, and lightweight standard bricks should be packed in containers or other solid packaging before transportation; standard clay bricks and ordinary clay bricks can be wrapped with straw ropes before transportation. During transportation, care should be taken to avoid damaging the...

Learn More

Baking and Technical Requirements of Refractory Cement

Refractory cement refers to cement with a refractoriness of not less than 1580°C. Refractory cement is a hydraulic cementitious material made from bauxite and limestone as raw materials. It is fired into clinker with calcium aluminate as the main component and an alumina content of about 50%, and then ground. According to different compositions, it can be divided into aluminate refractory cement, low calcium aluminate refractory cement, etc. Refractory cement can be used to bind various refractory aggregates (such as corundum, burned high-alumina clay, etc.) to make refractory castables, refractory mortars, or refractory concrete, and can be used as linings for cement rotary kilns and other industrial kilns. When baking refractory cement furnace lining, the following matters must be paid attention to 1. At the normal temperature 350℃ stage, local bursting is most likely to occur, so special attention should be paid to slow baking. If a large amount of steam still emerges after insulation at 350℃, the heating rate should still be slowed down. 2. Under conditions where ventilation is poor and water vapor cannot be easily discharged, the heat preservation time should be appropriately extended. 3. When baking with heavy oil, be careful not to spray heavy oil...

Learn More

Characteristics and Applications of Steel Fiber Refractory Castables

Steel fiber refractory castable is a material that adds heat-resistant steel fibers to the refractory castable. It has the following features and applications: Features 1. High strength: Heat-resistant steel fibers can increase the tensile strength and impact toughness of refractory castables. 2. Heat resistance: Heat-resistant steel fiber can maintain good strength and stability at high temperatures. 3. Crack resistance: Heat-resistant steel fibers can effectively reduce the cracking and shedding of refractory castables. 4. Durability: Heat-resistant steel fibers have good resistance to chemical attack and abrasion. Application 1. Steel industry: used for refractory linings of high-temperature equipment such as refractory furnaces, converters, and electric furnaces. 2. Petrochemical industry: used as a refractory layer in high-temperature chemical equipment such as oil refining units and catalyst regenerators. 3. Electric power industry: used in fire-resistant structures such as boilers, flue systems, and dust collectors in coal-fired power plants. 4. Metallurgical industry: used in high-temperature metallurgical equipment such as hot metal tanks, casting equipment, and continuous casting machines. The specific formula and dosage of steel fiber refractory castables will be adjusted according to actual needs and engineering requirements to achieve the required performance and durability.

Learn More

The Relationship between the Strength of Refractory Castables and Refractory Cement

Refractory castable is an essential unshaped refractory material among refractory materials. It is widely used for advantages such as convenient construction and saving manpower. To ensure that the refractory castable is more suitable for kiln smelting during actual use, its Hardness and refractory resistance are both important parameters of refractory materials. If the hardness does not meet the requirements, it will be difficult to provide a good working environment for the kiln. The proportion of cement in the refractory castable is the key to the hardness of the refractory castable. Although refractory cement affects the hardness of refractory castables, it does not mean that the greater the proportion of refractory cement, the better the strength! This understanding shows that there is insufficient understanding of refractory castables. Next, let’s take a closer look. Introduction to the strength-hardenability of refractory castables: Refractory cement is also called aluminate cement. When it is mixed with refractory aggregate, powder, and water, under the action of the cementing agent, it does not need to be calcined at high temperatures. It can achieve chemical or physical results if it meets its specific requirements. The combination results in the hardening of the refractory material and its high strength....

Learn More

How to Choose Refractory Castables

Refractory castables include acidic, alkaline, and neutral castables; they are divided into heavy castables and light castables according to density; they are divided into aluminum silicate, magnesia, magnesium chromium, corundum castables, and silicon-based materials. So how to choose refractory castables under different circumstances? First of all, we must consider the kiln environment, usage location, usage temperature, corrosion properties, construction precautions, etc. Only based on these basic requirements can we select appropriate refractory castables. 1. Kiln environment First of all, we need to look at the overall kiln environment of the kiln we want to build, including the medium in the kiln, the characteristics of the medium, the operating temperature of the kiln, and a characteristic of the kiln when it is working. Based on these environments, we can correct the selection of refractory castables. 2. Parts of use If it is the working layer, heavy refractory castables with high-temperature resistance should be selected. If the erosion is acidic, castables that are resistant to acid erosion should be selected. If the erosion is alkaline, castables that are resistant to alkaline erosion should be selected. If the parts in contact with slag should use castables with strong resistance to slag erosion; if...

Learn More