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Ladle castable is made of high-quality high-alumina bauxite clinker and silicon carbide as the main materials, and is composed of pure aluminate cement binder, dispersant, anti-shrinkage agent, coagulant, explosion-proof fiber, and other admixtures. Shaped refractory castables are also called aluminum silicon carbide castables due to their good effect on the working layer of the molten iron ladle. The working environment of Ladle The temperature of molten iron is 1300-1450℃. The reason why the lining material of the ladle requires frequent inspection or maintenance is due to the working environment that is better than that of high-temperature resistant materials: 1. When containing molten iron, the lining is impacted by high-temperature molten iron, causing erosion and wear and strong thermal shock stress; 2. During the period of holding molten iron, it is subject to chemical erosion by molten iron and slag and oxidation in the air; 3. When pouring molten iron, it will be washed away by the molten iron and oxidized at high temperature; 4. After the molten iron in the molten iron ladle is emptied, the temperature drops sharply, causing the ladle lining to cool rapidly and be exposed to the air and oxidize; In such a process, the lining...
Refractory concrete is a material composed of refractory aggregate, refractory powder, and cement or additional additives in a certain proportion. After mixing, shaping, and curing, it can be used directly. Composition of refractory concrete 1. Refractory aggregate: Refractory aggregate is the skeleton of refractory concrete and plays an important role in the high-temperature physical and mechanical properties of refractory concrete. 2. Refractory powder: Refractory powder can improve some properties of cement binders, reduce the amount of cement, increase the workability of refractory concrete mixtures and the tightness of concrete, and improve fire resistance. 3. Cementing agent: The main function of the cementing agent is to gel and combine refractory aggregates and refractory powders to form refractory concrete with certain properties. 4. Admixtures: There are many admixtures, such as coagulants, water-reducing agents, mineralizers, and expansion agents. Generally, the dosage is small, and its main function is to improve and enhance the performance of refractory concrete to better meet the requirements of construction and use. Characteristics of refractory concrete 1. The production process is simple, the production cycle is short and the efficiency is high. 2. It is easy to construct and manufacture and can be arbitrarily shaped to meet various requirements...
For large-scale construction of phosphoric acid and phosphate refractory castables using vibration molding and other methods, trapping materials is an effective and economical method, so it is widely used. After weighing the trapped material, add coagulant and stir evenly, then add the remaining cement and continue stirring for 1 to 2 minutes before it can be used for molding. The material trapping time is mainly determined based on the chemical reaction speed between the cement and the metal contained in the refractory aggregate and powder, as well as environmental temperature and other conditions. Phosphoric acid combined refractory castable samples were stored indoors, in the open air, and castable standard curing rooms. As the storage time increased, their normal temperature compressive strength increased, but indoor storage was better than outdoor storage. After 3 months of standard curing, the intensity tends to decrease slowly. When stored indoors, the compressive strength after burning is more than 10Mpa higher than that in the open air. The post-burning compressive strength stored in a standard curing room is also better than that in the open air. Samples stored in the open air may have lower performance than refractory castables due to changes in cold and heat...
Composition of steel fiber reinforced castable Steel fiber reinforced castable is a refractory castable composed of refractory aggregates, binders, and admixtures. Because heat-resistant steel fibers of a certain size are added to it (the amount is generally 1% to 3%), it is called steel fiber—reinforced castables. Steel fiber reinforced castables can also be divided into clay steel fiber castables, high alumina fiber castables, corundum fiber castables, etc. according to customer needs. Characteristics of steel fiber reinforced castables 1. Inhibit the shrinkage of castables; 2. Resistant to mechanical impact, strong toughness, and high strength; 3. Good thermal shock resistance; 4. Good thermal stress and crack resistance; Uses of steel fiber-reinforced castables Steel fiber-reinforced castables are often used to construct industrial furnace linings that are in contact with high-temperature gases and solid materials, such as heating furnace roofs, soaking furnace covers and walls, heat treatment furnace linings, and CFB boiler high-temperature cyclone separator linings—cement rotary kiln cooling cylinder lining roasting furnace lining, etc.
Steel fiber castable is a refractory castable made of corundum or high-alumina bauxite clinker as aggregate, aluminate cement as binder, and an appropriate amount of additives. The heat-resistant steel fibers used in steel fiber refractory castables should be selected according to the usage conditions of thermal equipment, and their appropriate dosage should be determined. Compared with ordinary castables, steel fiber castables are refractory castables that are mixed with 1% (volume %) heat-resistant steel fibers after undergoing ten rapid cooling and rapid heating cycles of 25°C water-1100°C-25°C water. The flexural strength is 2-4.5 times that of ordinary refractory castables (after ten cycles, the flexural strength of ordinary refractory castables decreased by 40-60%, while the flexural strength of refractory castables mixed with 1% (volume %) heat-resistant steel fibers The flexural strength of the material only dropped by 10 to 30%). From experimental comparisons, it can be seen that steel fiber castables have the characteristics of high flexural (tensile) strength, thermal shock resistance, impact resistance, and excellent wear resistance. Steel fiber castables have been successfully used as linings for various industrial kilns (including various types of cement kilns, drying furnaces, heating furnaces, etc.). The main parts used in cement kilns are pre-calciner kilns,...
Refractory products can be divided into three categories: acid-base refractory materials, neutral refractory materials, and alkaline refractory materials. For example, the key component of acid-refractory materials is silica, and the iconic products are silica bricks and clay bricks. Silica bricks are siliceous products containing more than 94% silicon. Its raw materials include silica and waste silica bricks. Acid-resistant slag is highly corrosive, has a high load softening temperature, and its volume does not approach or even slightly increase after repeated calculations. However, alkaline slag easily corroded it and has poor thermal shock resistance. Silica bricks are mainly used in thermal equipment such as coke ovens, glass furnaces, acid-base steelmaking furnaces, etc. Clay bricks use refractory clay as the main raw material, and the alumina content is 30%-46%. It is a weakly acidic refractory material with strong heat and shock resistance. Resistant to acid and alkali slag corrosion, widely used. The main components of neutral refractory materials are aluminum oxide, chromium oxide, or carbon. High-alumina corundum products are high-quality refractory materials that are widely used. Chromium bricks with chromium oxide as the main component have good resistance to steel slag corrosion, but under high-temperature loads, their thermal shock resistance is weak...
Refractory materials are widely used in the metallurgical industry, and engineering consumption accounts for about 60% to 70% of the total output. Therefore, the development of refractory materials is an important foundation for the metallurgical industry. However, precisely because the refractory materials are prepared at the time of preparation, the preparation process is relatively simple. Amorphous refractory materials commonly used in boiler structures generally consist of refractory aggregates, powders, mixtures, and binders. Therefore, many types of amorphous refractory materials have a wide range of applications. Refractory plastics are made from refractory aggregates and powders, raw clay, chemical binders, and admixtures. After preparation, mixing, and extrusion into bricks, it has good plasticity after being packaged and stored for some time. Typically, discontinuous refractory plastics are mostly repaired. Refractory ramming material is a material that can be formed by pneumatic sorting or manual ramming. The refractory spray material is injection molded. Refractory coatings are pump-cast with mud and mortar or applied by hand. The refractory material is molded with projectors. Fire-resistant pressed material formed by pressure devices such as mud pumps. Refractory clay or refractory cement is the connecting material for building refractory bricks. Refractory materials are classified mainly based on temperature...
In actual production operations, the factors that affect the service life of refractory bricks used in gasifiers can be divided into three categories: thermal stress shear extrusion, ash washing, and chemical reaction erosion. 1. Thermal stress shear extrusion During the startup, shutdown, and drying process of the gasifier, due to the different temperature rises and cooling rates of the refractory bricks during the heating or cooling process of the gasifier, relative displacement occurs. The thermal expansion of the refractory bricks causes shearing and extrusion between the refractory bricks, causing surface cracks in the refractory bricks and even local surface peeling. These cracks provide pathways for the penetration of molten ash. 2. Molten ash erosion During the operation of the gasifier, a large amount of high-temperature molten ash and slag carried by high-speed airflow cause strong wear and erosion on the surface of the refractory bricks, causing the surface to gradually wear and become thinner. 3. Chemical reaction corrosion During the operation of the gasifier, impurities such as liquid silica, alumina, titanium oxide, potassium oxide, and sodium oxide in the high-temperature molten ash enter the depth of the refractory bricks through the cracks and cracks on the surface of the refractory...
Among refractory brick products, the more common ones are standard bricks and ordinary bricks. When the shape of these bricks cannot meet the requirements of equipment use, special-shaped refractory bricks need to be used. Today I will introduce to you the characteristics and feelings of special-shaped refractory bricks. Interested friends can come and find out together. Special-shaped refractory bricks are refractory bricks with chaotic shapes. To customize special-shaped refractory bricks, it is necessary to communicate with the refractory brick manufacturer to determine the material, size, shape, and kiln location of the required special-shaped bricks. Special-shaped bricks can only be produced and processed according to detailed information such as drawings. Special-shaped refractory bricks can be customized according to user needs, such as clay special-shaped bricks, high-alumina special-shaped bricks, aluminum-carbon special-shaped bricks, magnesia-carbon special-shaped bricks, corundum special-shaped bricks, etc. The specific materials should be determined according to user needs. According to the refractory material standards, the ratio of the adhesive to the outer dimensions of the high-alumina special-shaped refractory bricks (the ratio of the minimum size to the maximum size) is within 1:5; there are no more than 2 recessed corners (including circular recessed corners), or the acute angle is 75° or...
The main purpose of refractory bricks as kiln lining is to improve production efficiency without delaying production due to damage to refractory bricks during the production process. Therefore, appropriate refractory bricks should be selected based on the characteristics of long furnace life and high efficiency. Refractory bricks produced by Xinhongji Refractory are an inorganic non-metallic material with a fire resistance of not less than 1580℃. The stability of refractory bricks against high temperatures under no load is called refractory degree, which reflects the basic performance of refractory bricks. Since refractory bricks are mainly used as structural materials for high-temperature kilns and other thermal equipment, as well as high-temperature containers and components used in industry, they can withstand various physical changes and mechanical effects. Therefore, the following basic requirements must be met 1. To meet the requirements of high-temperature operation, it should have the performance of not softening and melting at high enough temperatures. 2. It can withstand the load of the furnace and the stress during operation without losing structural strength, softening deformation, and collapse at high temperatures, which is usually expressed by the load softening temperature. 3. The volume is stable at high temperatures. The kiln masonry or pouring...
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