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The blast furnace is currently the main smelting equipment, which has the characteristics of simple public welfare and high production capacity. The refractory brick furnace lined in a blast furnace to occupy an important position. However, during the production process, due to the role of various functions, the inner lining of the fire-resistant brick of the furnace wall was gradually eroded. Therefore, to extend the service life of the high-temperature furnace, it is necessary to reasonably choose the refractory brick furnace. The selection method for the refractory bricks of each part is as follows: 1. The stove and throat are mainly impacted and worn by the furnace material. Generally, steel bricks or water-cooled steel bricks are used. 2. When using a thin-walled structure in modern large blast furnaces, chemical erosion, and abrasion resistance should be selected. Among them, high-density clay bricks are most suitable to replace bricks. 3. Its destruction mechanism is mainly the heat shake peeling, high-temperature gas erosion, the precipitation of alkaline metals, zinc, and carbon, and the chemical erosion of the initial residue. The brick lining should be used to resist the refractory material with heat shock, residual slag erosion, and anti-erosion. The practice has proved that...
Fire-resistant plastic is made of 70-80% granular and powdery materials, plus 10-25% plastic clay and other binders and an appropriate amount of plasticizer. Through adjustment, it can maintain high plasticity within a corresponding period, but the fire-resistant plastic The construction and maintenance of refractory plastics must be carried out according to certain standards. Today I will give you a brief introduction to the construction, maintenance, and baking requirements of refractory plastics. Fire-resistant plastic construction 1. Mixing: The plastic must be mixed with a forced mixer with a speed of not less than 26 rpm. Dry mix for 2-3 minutes, and then add clean water. The amount of water should be added according to the water-adding range requirements of different brands. Ensure that it is easy to mix. Under the best construction performance, the less water is used, the better. After adding water, stir for no less than 5 minutes until uniform. The mixed materials should be used up within half an hour. If there is any material that has initially been set and dried, it should not be used again. used, should be scrapped. 2. Pouring and vibration molding: The material should be vibrated while the cloth is being spread,...
The insulation layer of an alumina rotary kiln is a layer of refractory fiber felt on the kiln shell, and then diatomaceous earth, floating bead bricks, or lightweight clay bricks. Some now use lightweight refractory castables. The working lining of the prezone is constructed with clay bricks, and the high-temperature calcined zone is constructed with high alumina bricks or phosphate-bonded unfired high alumina bricks. At present, unshaped refractory materials have been widely used in the aluminum industry, such as low-calcium aluminate refractory castables for the calcining zone, steel fiber-reinforced wear-resistant castables for the kiln mouth, kiln hood, kiln tail, and other parts. The flash furnace installs heat-resistant steel anchors or ceramic anchors on the furnace shell, then lays a layer of 20mm thick refractory fiber felt, and finally pours 200-300mm thick refractory castables. The working lining of the reverberatory furnace of the aluminum smelting furnace in contact with the aluminum liquid is generally built with high-aluminum bricks with an aluminum content of 80 to 85%; when smelting high-purity metallic aluminum, mullite bricks or corundum bricks are used. The combination of silicon nitride and silicon nitride bricks is used for the erosion and wear parts of the hearth slope such as...
Recently, many customers have inquired about refractory materials for waste incinerators. In response to the selection problems faced by customers, Xinhongji Refractory has compiled a list of refractory materials for waste incinerators for reference only. Different types of incinerators vary based on type, temperature, and location. Please read carefully. Commonly used incinerators include intermittent incinerators, grate incinerators, calcium oxide incineration systems, fluidized bed incinerators, rotary incinerators, etc. Refractory materials for waste incinerators have the following characteristics: Good volume stability; good high-temperature strength and wear resistance; good acid resistance; good seismic stability; good corrosion resistance (CO, Cl2, SO2, HCl, alkali metal vapor, etc.); good processability (amorphous); good heat resistance and insulation. Use different incinerators, different components, and different temperatures. The following selection suggestions are for reference only: The operating temperature of the top, side walls, and burner of the combustion chamber is 1000-1400℃. High alumina bricks, clay bricks with a fire-resistance rating of 1750~1790℃ and plastic bricks with a fire-resistance rating of 1750~1790℃ can be selected; The operating temperature of the upper, middle, and lower parts of the grate side is 1000~1200℃. Silicon carbide bricks, clay bricks, and wear-resistant castables with a fire resistance of 1710-1750℃ can be used; The operating...
In their daily lives, people often see fires breaking out in some places, causing huge property losses and even casualties. For this reason, more and more companies are using refractory materials made of refractory castables in construction. So, fire-resistant How does the castable perform? What are the properties of castables? 1. Acid-resistant castable is a new anti-corrosion material composed of multiple components, including potassium silicate as the binder, inorganic molecular materials as the curing agent, and silicate as the acid-resistant filler. 2. Acid-resistant castables have high mechanical strength and excellent bonding properties, especially the bonding force between rapid masonry granite materials, acid-resistant ceramic tiles, porcelain plates, and cement. 3. Acid-resistant castables have stable performance in various concentrations of organic acids and inorganic acids, especially in dilute acids, industrial water, and neutral aqueous solutions, no crystalline salts are generated, and they have substantial impermeability. 4. Good heat resistance. In titanium rotary kiln lining, the service temperature can reach 950℃-1000℃. 5. The acid-resistant castable uses a non-toxic curing agent, which is non-toxic to construction workers and construction workers. It can be used for anti-corrosion projects of food, medicine, and other equipment, and has been identified by the medical and health department. 6....
Castables are mainly divided into castables for ordinary construction and refractory castables for high-temperature kilns. It is an amorphous material. Ordinary castables for building buildings usually refer to materials poured into the construction of building walls. They are usually not It has refractory properties, and refractory castable is a type of castable used in the construction of high-temperature kiln linings. There are many types of castables. Today, the editor will take you to understand what refractory castables are. Refractory castables are usually composed of refractory aggregates, powders, and binders, but sometimes to improve the fire resistance of refractory castables, we also add various refractory raw materials, such as stainless steel fibers, inorganic fibers, corundum, etc. Special refractory materials are used to improve the refractory properties of the castables to ensure that they can work normally during the operation of high-temperature furnaces. There are many types of refractory castables. Generally, there are two main types during the use of high-temperature kilns. One is lightweight insulation castables, and the other is heavy refractory castables. Lightweight insulation castables are divided into clay-based and high-aluminum based on raw materials, such as lightweight acid-resistant castables, lightweight alkali-resistant castables, etc. There are many types. We generally...
Hook castables refer to the castables used in tap hooks in blast furnace tapping plants. Blast furnaces are mainstream iron-making equipment. They are eroded by molten iron for a long time during operation, so they are used during construction. Refractory materials of various materials, such as refractory castables, refractory bricks, etc. Iron Hook Castable The blast furnace tap hook is a circulation channel for molten iron and requires high-temperature-resistant refractory castables. The blast furnace tap hook castable is a castable specially designed for the tap hook. It is generally an ultra-low cement refractory castable. Castable refractory castables composed of corundum or high-alumina clinker, silicon carbide, carbon, binders, and admixtures are mainly used for the lining of blast furnace tap hooks. Properties of Hook Castables To adapt to high-temperature resistance, iron hook castables have very good characteristics, such as high strength, thermal shock resistance, etc. The following editor will introduce several types in detail: 1. The first properties of iron hook castables are high-temperature resistance and high strength. The strength is high enough to resist the erosion of molten iron, that is, it has strong resistance to the erosion and erosion of molten iron and slag; 2. It has good thermal...
1. Refractory Mud Ingredients: Refractory mud is usually composed of refractory materials such as silicate or high alumina, binders, and other additives. Features: Refractory mud has relatively good plasticity and is easy to construct. It is suitable for masonry, repair, and connection of small parts on the surface of high-temperature equipment. It can withstand higher temperatures but has a relatively low operating temperature range. Application: Refractory mud is often used for repairing, patching, plugging leaks in high-temperature equipment, and building furnace walls, furnace roofs, and other parts. 2. Refractory Cement Composition: Refractory cement is mainly composed of refractory stone, high alumina stone, and other primary materials and a certain proportion of binder. Features: Refractory cement has high high temperature resistance and corrosion resistance. It is a structural refractory material, suitable for directly building the overall structure of high-temperature equipment, and has good compressive strength and stability. Application: Refractory cement is often used to build the overall structure of furnace bodies, kilns, furnaces, and other high-temperature equipment, such as furnace walls, furnace bottoms, etc. 3. Refractory Castables Composition: Refractory castables are composed of refractory aggregates, binders, and water-adding agents. The refractory aggregates can be high-aluminum aggregates or silicon carbide. Features: Refractory...
There are certain differences between steel fiber castables and steel fiber wear-resistant castables, because adding a certain proportion of silicon carbide to the wear-resistant castables enhances the strength and wear resistance of the castable materials, and greatly improves the heat resistance of the castable materials. vibration stability. Steel fiber castables add a certain proportion of steel fibers to low-cement refractory castable materials, so there are certain differences between these castables. 1. The similarities between steel fiber castable and steel fiber wear-resistant castable The two casting materials are similar in that they both have added steel fibers, which provide good toughness and tensile resistance. However, the increase in wear resistance and corrosion resistance of silicon carbide added to wear-resistant materials is different from that of ordinary steel fiber materials, which also need to be used in special parts of the kiln lining to a certain extent. Both castables are constructed by adding a reasonable proportion of water during the construction process. By pouring the mold into the construction site, using a vibrator for reasonable vibration, slurry discharging, compaction, and demoulding, it is put into use after maintenance and baking. 2. The difference between steel fiber castable and steel fiber wear-resistant castable...
Thermal storage balls are widely used in petroleum, chemical, ceramics, environmental protection, and other industries as grinding media, proppant, filler, catalyst, catalyst carrier, etc. The uses of thermal storage balls are mainly related to their characteristics. Products vary according to use, content, size, indicators, etc. Now let us briefly talk about common uses. To prevent excessive heat loss during the production of high-temperature kilns, people have adopted a variety of methods to preserve heat well. The use of heat storage balls is one of the effective measures because it can not only absorb heat well but also maintain it for a long time. The most important thing is that it can transfer the stored heat energy to other substances promptly. The ball is small and has a strong ability to withstand pressure. After long-distance transportation, the basic mountain will not be damaged, effectively solving the transportation problems that people worry about. The wide application of heat storage balls is mainly due to its many advantages of convenient production. Generally, substances melt under high-temperature conditions, and heat storage balls have a strong ability to withstand high temperatures and will not melt or deteriorate. The advantage of not undergoing chemical changes in...
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