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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...
The carbon calcining furnace is a high-pressure molded carbon material product. Under the condition of isolating air, the carbon roasting furnace is indirectly heated at a specified temperature to improve the strength, conductivity, and high-temperature resistance of carbon products. Carbon calcining furnaces are divided into continuous multi-chamber, closed, and open types. Since the high temperatures in various parts of the calciner are different, the refractory materials used for the refractory bricks in the calciner are also different. Such as brick piers at the bottom of closed roasting furnaces, pit bricks that bear the weight of the upper masonry and baked products, fire shafts with temperatures above 1400°C, etc. Therefore, the masonry is mostly made of clay bricks with high mechanical strength and good thermal stability. The lid of the closed roasting furnace needs to be moved during the production process, so it is built with lightweight refractory bricks. The main structure of the carbon calcining furnace includes the furnace bottom, side walls, fire channels, and connected fire channels. The furnace bottom is made of lightweight refractory bricks, the material box is made of special clay bricks, the side walls are made of lightweight refractory bricks, and the fire passages and...
What is the temperature of an ordinary flame? Generally speaking, the highest temperature flame is around 500℃. Of course, the flame temperature of different burning materials will also vary. What is the maximum temperature range of mullite refractories? According to test standards, the refractory temperature of mullite refractory bricks should be around 1200℃-1700℃! What is this concept? The iron-making temperature is generally around 1300-1500°C, and mullite refractory bricks can withstand the test of molten iron for a certain period. Therefore, the fire-resistant properties of mullite refractory bricks are real. The ultra-high temperature performance of mullite refractory bricks makes it the first choice for high-temperature furnace construction. However, on January 19, 2018, the national standard “mullite” officially implemented the testing of “refractory bricks” (GB845). Of course, we are unfamiliar with the various testing indicators specified in the new standards. Below, Henan refractory brick manufacturer Xinhongji Refractory will introduce them to you in detail. First, the mullite refractory brick license plate logo is divided into 7 levels, mg-23, mg-25, mg-26, mg-27, mg-28, mg-30, and mg-32. When the change rate of the heating line is less than 2%, the corresponding test temperatures are 1230°C, 1350°C, 1400°C, 1450°C, 1510°C, 1620°C, and 1730°C. Secondly, the...
Friends who know a little about our refractory products must know that clay refractory bricks and refractory bricks are refractory materials. So at this point, some friends must be asking, what is the difference between these two products? If you happen to need this product, then the refractory brick manufacturer will now give you a simple explanation. Clay refractory bricks are a type of refractory bricks and are accurately defined as shaped refractory products. It is the difference between a series of refractory materials and the form of delivery. Conceptually, clay refractory bricks are a weakly acidic refractory material using refractory clay or burnt stone clinker as the main raw material. It is a weakly acidic refractory material with good thermal shock resistance and acid slag corrosion resistance. It is widely used. Clay bricks with refractory clay as the main raw material are called ordinary clay bricks, and clay bricks with lower apparent porosity are called low-porosity clay bricks. Refractory bricks are referred to as fire bricks. Refractory materials are made of refractory clay or other refractory materials. Light yellow or brown. It is mainly used to build smelting furnaces and can withstand high temperatures from 1580°C to 1770°C. Also...
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