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Refractory balls for blast furnaces are spherical refractory products made of special materials, which are used for lining and filling materials of blast furnaces. When choosing refractory balls for blast furnaces, their physical and chemical properties need to be considered comprehensively. In terms of physical properties, refractory balls for blast furnaces should have high compressive strength, wear resistance, impact resistance, and heat resistance. At the same time, the particle size distribution of the balls should also be considered to meet the different needs of the lining of the blast furnace. In terms of chemical properties, the composition of refractory balls should be able to resist the erosion of various chemical substances in the blast furnace, and it should also be compatible with other materials of the blast furnace to maintain the overall performance of the blast furnace. In addition, when choosing refractory balls for blast furnaces, their service life should also be considered. Refractory balls of good quality should be able to maintain their performance for a long time, reduce the frequency of replacement, and reduce maintenance costs. Finally, according to the specific process conditions and production requirements of the blast furnace, choosing suitable refractory balls for blast furnaces will...
Common castables for circulating fluidized bed boilers mainly include refractory concrete, refractory plastics, and refractory mud. These materials have good high-temperature resistance and chemical stability and can withstand extreme temperatures and corrosive environments inside the boiler. Refractory concrete is mainly composed of a mixture of refractory aggregates and binders. It has high compressive strength and refractoriness, and can effectively protect high-temperature parts such as boiler furnaces and furnace walls. Refractory plastic is a refractory material with a certain fluidity and strong plasticity. It can tightly fill the complex structure inside the boiler to form a uniform refractory layer with good insulation and heat preservation effects. Refractory mud is mainly composed of refractory fine powder and adhesives. It can be easily applied to the inner wall of the boiler to form a solid protective layer with good thermal shock resistance and wear resistance. When selecting castables, it is necessary to comprehensively consider the specific working conditions and operating requirements of the boiler. Factors such as temperature, pressure, and corrosiveness will affect the selection and use of castables. Therefore, it is recommended to select suitable castables under the guidance of professionals. In addition, to ensure the use effect and service life of...
Refractory spray castables are a type of refractory material used in high-temperature industrial furnaces and other equipment. It is mainly used in the following scenarios: 1. Iron and steel industry: In blast furnaces, hot blast furnaces, steel rolling heating furnaces, and other equipment, refractory spray castables can be sprayed on the surface of the furnace lining to form a protective layer to resist high temperature and chemical corrosion, protect the furnace body, and extend service life. 2. Non-ferrous metal industry: In non-ferrous metal smelting furnaces such as copper and aluminum, refractory spray castables can also play a similar role, protecting the furnace lining materials from high temperature and chemical corrosion. 3. Ceramic industry: In ceramic firing kilns, tunnel kilns, and other equipment, refractory spray castables can be sprayed on the surface of kiln tools and kiln walls to play a role in heat insulation and protection, and improve the quality and output of ceramic products. 4. Chemical industry: In some high-temperature chemical reaction equipment, refractory spray castables can be sprayed on the inner wall of the equipment to resist high temperature and chemical corrosion and protect the normal operation of the equipment. In general, refractory sprayed castables are mainly used...
Both ramming material and castable material are refractory materials used in high-temperature equipment such as high-temperature industrial furnaces, heat treatment furnaces, ceramic kilns, etc. The main difference between them lies in the production process and the use environment. Ramming material is a refractory material made by the ramming process, usually composed of aggregate, powder, and binder. In the production process, the aggregate and powder are mixed in a certain proportion, and the binder is added and then made through stirring, kneading, ramming, and other processes. Ramming material has good refractory performance and high-temperature resistance and is suitable for furnace linings, grate bars, furnace tops, and other parts in various high-temperature equipment. Castable material is a refractory material made by a pouring process, usually composed of aggregate, powder, binder, and admixture. In the production process, the aggregate, powder, and binder are mixed in a certain proportion, and the admixture is added and then made through stirring, kneading, pouring, and other processes. Castable material has good fluidity and plasticity and is suitable for furnace walls, furnace bottoms, chimneys, and other parts in various high-temperature equipment. In general, ramming materials and castables differ in manufacturing process and use environment. The specific choice of...
Low-cement high-aluminum castables are a type of refractory material, which is mainly composed of high-aluminum bauxite clinker, corundum, mullite, and other aggregates, as well as binders such as silicate cement and alumina cement. This castable has a low cement content and a high aluminum content, so it has high refractory performance and good fluidity. Low-cement high-aluminum castables are mainly used for the lining of high-temperature kilns, such as cement kilns, glass kilns, etc., and other places where high-temperature refractory materials are required, such as steel, non-ferrous metals, and other industries. Its advantages include: 1. High refractory performance: Because it contains high-aluminum refractory materials such as high-aluminum bauxite clinker, it has high refractory performance and can withstand the erosion of high-temperature furnace gas. 2. Good fluidity: Due to the addition of an appropriate amount of cement and other binders, the castable has good fluidity and is convenient for construction. 3. Good wear resistance: Because the aggregate particles are coarse, it has good wear resistance and can resist the wear of materials such as slag during use. 4. Good anti-stripping performance: Since the aggregate particles are coarse and uniform, it has good anti-stripping performance and can maintain the stability of the structure...
Corundum castables, corundum mullite castables, and chrome corundum refractory castables are all high-grade castable castables, but because of their different corrosion resistance at different temperatures, they should be selected according to different temperatures when used. Regardless of whether it is corundum, mullite, or chrome corundum refractory castables, pure calcium aluminate cement is used as a binder. Although the same binder is used, the compressive strength, apparent porosity, and bulk density of the three castables at different temperatures are different. The corrosion resistance at different temperatures is also different. Mullite, corundum, and the main phase of corundum refractory castables is corundum, while the main phases of chrome corundum and mullite do not change after being corroded. However, at 800°C, the strength of chrome corundum refractory castables will decrease after reacting with alkali, and the amount generated is small, but mullite and corundum refractory castables are not significantly corroded by alkaline. Alkali has little erosion on mullite castables, and the morphology and structure of mullite are complete. At 800℃, the corundum refractory castable also reacts very little with alkali. There is a layer of flaky material on the surface of the corundum particles, β-AL2O3, which is generated in small amounts, and the...
Boiler furnace castable is a refractory material used to protect and decorate the boiler furnace. It is usually mixed with high-aluminum or siliceous aggregates, high-aluminum cement, silica powder, chromite, and other raw materials. Boiler furnace castable has good refractory performance, high-temperature strength, and wear resistance, and can effectively protect the boiler furnace and extend the service life of the boiler. At the same time, it also has good chemical stability and can resist the erosion of acidic or alkaline substances. Boiler furnace castable has the following advantages in production and use: 1. Simple production process and easy operation; 2. Rich raw materials and low cost; 3. Good refractory performance and high-temperature strength; 4. Good wear resistance and long service life; 5. Good chemical stability and can resist the erosion of acidic or alkaline substances. Boiler furnace castable is mainly used for the furnace lining of industrial boilers, power station boilers, and other equipment. It can also be used for the lining of high-temperature equipment such as high-temperature flues and chimneys. During use, the following points should be noted: 1. Inspection should be carried out before use to ensure that the product quality is qualified; 2. During the construction process, stirring,...
Refractory castables are essential refractory materials in high-temperature industrial kilns. They are mainly used to protect kilns, furnace walls, and other equipment from high temperatures and chemical corrosion. To ensure the stability of the kiln and the service life of the kiln, extending the service life of refractory castables is the key. So how to extend the service life of refractory castables? To extend the service life of refractory castables, we can take a series of methods and measures to ensure their stability and durability. 1. Choose the right type of refractory castable For different high-temperature kilns, due to different working temperatures, media, and working environments, refractory castables of different materials and models are required. Therefore, when selecting refractory castables, factors such as working temperature, corrosive gases, and media properties should be fully considered to ensure that the right refractory castables are selected to extend the overall life. 2. The construction process should be carried out strictly in accordance with the work standards During the construction process, the construction team should strictly follow the construction standards to avoid damage to the refractory castables due to improper construction or a decrease in refractory strength due to pollution of raw materials. Therefore,...
High-temperature-resistant castables are constructed 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 the construction quality of the previous process and clean the boiler construction site. Transport the forced mixer, insert vibrator and trolley to the boiler construction site, install them in place, and test run them normally. The following table shows the technical indicators of the insert vibrator. It should be pointed out that the mixer is forced, the vibrator should be high-frequency, and there should be enough spare parts. The template should have sufficient strength and rigidity, even if transported to the boiler construction site; the lighting power supply should be turned on, and clean water should be connected to the mixer. High-temperature resistant castables are generally bagged, and materials such as anchor bricks, connectors, thermal insulation refractory bricks, calcium silicate boards, asbestos boards, refractory clay bricks, and burner bricks should be transported to the boiler construction site at any time as required. When chemical binders are used, their concentration or density should be adjusted in advance and transported to the boiler construction site for use. Before use, they should be...
Thermal expansion and cold contraction: When the boiler is running, the refractory bricks are alternately affected by high temperature and cooling, and are prone to thermal expansion and cold contraction, causing the gaps between the bricks to become larger, causing the refractory bricks to loosen and fall off. Chemical erosion: The acidic gas or chemical substances produced when the fuel is burned in the boiler will corrode the refractory bricks, causing them to gradually loosen and cause them to fall off. Mechanical damage: During the operation of the boiler, mechanical damage such as vibration or impact may occur, causing the refractory bricks to be damaged or fall off. Dealing with fallen refractory bricks usually requires the following measures: Inspection and repair: Regularly check the refractory bricks inside the boiler, and promptly repair or replace any damaged or loose bricks. Reinforced support: Reinforce the supporting structure on the upper part of the refractory bricks to reduce the possibility of the bricks loosening and falling off due to thermal expansion and cold contraction. Control the fuel composition: Try to control the fuel composition and combustion process to reduce the chemical erosion of the refractory bricks. Repair or replace: Refractory bricks that have...
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