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Typical aluminum smelting furnace lining refractory materials are usually made of high-alumina refractory materials, Si3N4 combined with SiC refractory materials. When high-alumina refractory materials are used, since the components such as SiO2 and impurities Fe2O3 in the refractory materials will be reduced to Si and Fe and melt into metallic aluminum, it is difficult to obtain high-purity metallic aluminum. When Si3N4 combined with SiC refractories is used, although impurities can be reduced and melted into metallic aluminum, higher purity metallic aluminum can be obtained, since Si3N4 combined with SiC refractories contains Si components, there is still metal aluminum from Danger of Si pickup in refractory materials. Therefore, producing extremely high-purity aluminum requires a refractory material that does not introduce impurities. According to the chemical principle, among the existing refractory products, it is considered that the corundum refractory material produced by using the same raw material as the aluminum metal—Al2O3 as the raw material can meet the above requirements. This kind of corundum refractory material is mainly made of sintered alumina or tabular alumina and mixed with an appropriate amount of alumina micro powder. The key technology is to use a pure matrix to achieve a self-cleaning structure of alumina to...
The operating environment of the coal gasifier is poor, and the requirements for the use of the refractory lining are relatively strict. General refractory products cannot meet the requirements for use at all, and special refractory products are needed. How to choose refractory materials suitable for the coal gasifier? Please see the introduction of the materials of the fire surface, backing, heat insulation layer, and compressible layer of the gasifier below. The refractories used in gasifiers are easily damaged by refractory bricks, the inner layer facing the fire surface. The working conditions of refractory bricks are very poor: high temperatures up to 1700 ℃, chemical gas erosion, carbon black wear, heavy oil ash corrosion, and drastic changes in temperature and pressure, so special refractory bricks are required. What are the requirements for refractories in coal gasifiers? High-pressure high-temperature slag gasifiers have stricter requirements on refractory materials. In addition to meeting the strength requirements for high-temperature protection of pressure vessels, the corrosion of furnace bricks by slag in high-pressure oxidizing and reducing atmospheres should also be considered. This requires the refractory material of the gasifier to have the following characteristics. 1. It has high-temperature heat resistance to reduce radial heat dissipation,...
Adding steel fibers to refractory castables can improve the wear resistance, thermal shock resistance, and bending strength of the castables, which are favored by customers. The addition of steel fibers can increase the wear resistance of refractory materials, improve the thermal shock resistance and bending strength of castables, etc. Adding steel fibers to refractory castables combines the advantages of the two materials and is favored by customers. Steel fiber castables’ ratio and application are the keys to the product. An excellent ratio can not only improve the various properties of the castable but also embody environmental protection. In the ratio and application of steel fiber castables, the steel fibers used for refractory castables generally have a diameter of 0.4-0.5mm and a length of 25mm. The shape and cross-section of the steel fiber are crescent-shaped. The amount of steel fiber added to the castable is 1-5% (by weight), and the length and amount of steel fiber should be appropriate. Generally, water is added to the mixture first, and then steel fiber is added for full stirring. It not only makes the mixture evenly stirred, but also saves 1/3 of the stirring time compared with stirring in the dry material where the...
1. When used in the iron and steel industry, the service life of chrome corundum bricks is more than double that of corundum materials, such as breathable ladle bricks, etc.; used in the non-ferrous smelting industry, the wear resistance and corrosion resistance of chrome corundum bricks are significantly better than other bricks. 2. Used in the carbon black industry, the service life of chrome corundum bricks used by Guangdong Maoming Carbon Black Factory is twice as long as that of corundum bricks used under the same conditions. Chrome corundum bricks are used in carbon black reactors in carbon black factories, and their service life has exceeded that of corundum bricks. 3. It is used in the petrochemical industry. Because of the long-term high temperature (1350~1450℃), high pressure (3.1~8.53MPa), strong recovery atmosphere (CO+H2+CH4), and air velocity in the gasifier of large and medium-sized fertilizer plants Large (about 10m·s-1), the corrosion and damage to the lining refractory material are severe, so the requirements for the lining refractory material are higher. 4. High-performance chrome corundum bricks have high density and high strength and are more resistant to air erosion and wear resistance than corundum bricks. The introduction of Cr2O3 into corundum bricks changes...
Heat storage balls, also known as spherical heat storage bodies, have the advantages of good thermal shock stability, large heat storage, high strength, easy cleaning, and reusability. In order to improve the utilization rate of heat energy and reduce energy consumption, heat storage balls are often used in blast furnaces as waste heat recovery. Through the double preheating of gas and air, the regenerative heating furnace can reduce exhaust gas by 20%-50%, reduce the exhaust gas temperature to below 150 degrees, increase production by 15%-20%, shorten billet heating time by 50%, and reduce oxidation burning. Lose 30%-50% of the environmental protection and energy-saving effect. The heat storage ball is suitable for the selection of the heat storage ball combustion system of gas and non-gas fuel industrial furnaces, especially suitable for the heat storage furnace in the iron and steel industry, the heat storage ladle oven, the air separation equipment regenerator in the air separation industry, and the nonferrous metals. In regenerative smelting furnaces in the metal industry, heat storage balls can also be used as heat storage carriers in large-scale forging plants such as regenerative trolley furnaces, regenerative electric boilers, and regenerative incinerators. In addition, it is especially suitable for...
The construction of high-temperature resistant castables is carried out by the vibration method, which is widely used, including the construction of dry vibration materials. 1. Preparation before construction According to the design size requirements, check and accept the construction quality of the previous process, and clean up the boiler construction site. Transport the forced mixer, plug-in vibrator, and trolley to the boiler construction site, install it in place, and test run normally. The following table shows the technical indicators of the plug-in vibrator. It should be pointed out that the mixer is forced, the vibrating rod should be of high frequency, and there must be enough spare parts. The template should have sufficient strength and rigidity, even if it is transported to the boiler construction site; the lighting power is connected, and the clean water is connected to the mixer. High-temperature resistant castables are generally packed in bags, and materials such as anchor bricks, connectors, heat-insulating refractory bricks, silicon-calcium boards, asbestos boards, refractory clay bricks, and burner bricks should be transported to the boiler construction site at any time as required. When the chemical binder is used, its concentration or density should be adjusted in advance and transported to the...
Lime rotary kiln preheater and front and rear kiln mouth usually use refractory castables, but the quality of the preheater and kiln mouth is not the same. Although the service temperature of the lime shaft kiln feed port and preheater lining is not high, they are quickly damaged by mechanical and airflow erosion and wear of materials. Steel fiber wear-resistant castables and steel fiber castables for preheaters are selected. Steel fiber castables are mainly due to their high wear resistance. It can resist the erosion of special parts of the kiln mouth. The refractories used in lime kilns have a short service life and a large number of repairs. Choosing the right refractory material to improve the masonry process and strive for the life of the kiln lining is a common concern of the user and the castable manufacturer. According to the differences in various parts of the lime kiln, different refractory castables are used. Steel fiber reinforced castables for the kiln head cover, mullite high-strength wear-resistant castables for easy wear and tear on the low wall of the grate cooler, and some manufacturers use wear-resistant bricks. Steel fiber high-strength wear-resistant refractory castables are used for coal injection pipe material...
High-alumina anchor bricks are refractory bricks for heating furnaces. High-alumina anchor bricks are also called hanging bricks. They are mainly used to connect and support the structure of refractory bricks and ordinary sintered bricks and are used for heating furnace roof walls or other parts. High-alumina anchor bricks are made of natural high-grade bauxite as the main refractory raw material, adding soft or semi-soft clay as a binder to the high-alumina clinker to start batching, mixing, molding, drying, and finally firing. Shaped high alumina refractory bricks. Generally, the alumina content of high-alumina anchor bricks is more than 55%. High-alumina anchor bricks can be produced and processed according to customer needs. The load softening temperature of high-alumina anchor bricks can reach 1550°C, which can meet the performance requirements of heating furnace roof lining. Features of high alumina anchor brick for heating furnace: 1. Stable volume at high temperature. 2. Good corrosion resistance. 3. High softening temperature under load. 4. Anti-stripping and high compressive strength. The high-alumina anchor brick is a special-shaped high-alumina refractory brick, which includes a column composed of a hanging end and an anchor body, and interval division grooves on the surface of the anchor body, along the length...
The heat storage ball is widely used, and it has become an indispensable product in the chemical industry. It has the advantages of low refiring line shrinkage, high softening temperature under high-temperature load, corrosion resistance, high strength, large heat storage and discharge, and good thermal shock stability. , good thermal conductivity, small thermal expansion coefficient, and other remarkable characteristics, it is an excellent refractory material. Refractory balls are widely used in different types of ceramics, enamel, glass, chemical industry, etc. Finishing and deep processing of thick and hard materials in the factory. The heat storage ball is suitable for the selection of the heat storage ball combustion system of gas and non-gas fuel industrial furnaces, especially for the virtual heat heating furnace in the iron and steel industry, the heat storage ladle baker, the air separation equipment heat accumulator in the air separation industry, and the nonferrous metals. Regenerative smelting furnaces in the metal industry can also be used as heat storage carriers in large-scale forging plants such as regenerative trolley furnaces, regenerative electric boilers, and regenerative incinerators. The heat storage balls are divided into solid balls and concave-convex perforated balls. With the same raw material, the same formula, and...
The application of refractory and wear-resistant materials for circulating fluidized bed waste incinerators is mainly divided into the following areas: air chamber, dense-phase area at the lower part of the furnace, combustion area, feeding port, high-temperature cyclone separator, and return pipe, etc., different areas Reasonable refractory and wear-resistant materials should be selected according to the atmospheric conditions. Generally speaking, refractory bricks are better used in regular areas, and castables or plastics are used in irregular areas that are difficult to construct. The water-cooled air chamber is generally designed as an anti-wear structure with a single-layer lining. The material can be made of medium-quality wear-resistant plastic, and the air distribution plate is made of self-flowing corundum castable or corundum wear-resistant plastic. For fluidized bed waste incinerators, the density difference between the bed material and the waste is relatively large, and the waste is mainly burned in the dilute phase area, while the temperature in the dense phase area is relatively low, and the wear is relatively strong. Generally, corundum castables or wear-resistant plastics are used. Oxygen-deficient combustion here has a strongly reducing atmosphere, and the Fe₂O₃ content of the material should be strictly controlled to improve the corrosion resistance of the...
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