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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...
High alumina bricks and silica bricks may differ in fire resistance and chemical composition, so do not mix them. High alumina bricks and silica bricks are two common refractory materials, each of which has some characteristics: High alumina bricks 1. High alumina bricks are mainly composed of alumina as the main component, and usually contain between 50% and 80% aluminum, so they have high fire resistance and wear resistance. 2. It has excellent high-temperature resistance and can withstand the effects of high-temperature environments without losing stability. 3. It has good corrosion resistance and is suitable for acidic or alkaline environments. 4. Usually used as lining materials for high-temperature environments such as linings of high-temperature industrial equipment, metallurgical furnaces, and glass kilns. Silica bricks 1. Silica bricks mainly comprise silicate as the main component and have a high silicon content. Commonly used components include silica and alumina. 2. It has good wear resistance and acid and alkali resistance, but compared with high alumina bricks, its high-temperature resistance is poor. 3. Suitable for use in general building materials, such as heat insulation, thermal insulation, firewalls, and other low-temperature or normal-temperature environments. 4. In general, high alumina bricks are suitable for use in...
Refractory bricks for ceramic rotary kilns need to meet the following requirements: High-temperature performance: The operating temperature of the ceramsite rotary kiln is relatively high, so the refractory bricks are required to maintain their shape and performance at high temperatures without softening, melting, or deformation. Thermal shock resistance: Due to temperature changes in the ceramsite rotary kiln, refractory bricks are required to have a certain thermal shock resistance to cope with the effects of temperature changes. Wear resistance: The refractory bricks in the ceramic rotary kiln need to withstand the high-speed flow and friction of materials, so they are required to have sufficient wear resistance to prevent excessive wear. Chemical stability: The refractory bricks in the ceramic rotary kiln need to be in contact with a variety of chemicals, so they are required to have excellent chemical stability to prevent erosion. Strength: Refractory bricks need to have a certain strength to withstand the pressure and friction within the kiln. Dimensional stability: The dimensions of refractory bricks need to remain stable to ensure the masonry quality and service life of the kiln. Environmental protection: Environmentally friendly materials should be selected for refractory bricks used in ceramsite rotary kilns to reduce the...
The main function of adding zirconia to corundum bricks is to enhance their performance and durability. Zirconia is an important refractory material with various characteristics: High melting point: Zirconia has a high melting point, about 2700 degrees Celsius, allowing it to maintain stability in high-temperature environments. Excellent heat resistance: Due to its high melting point and thermal stability, zirconia is often used in high-temperature industrial applications, such as refractory materials, thermal insulation materials, etc. Excellent chemical stability: Zirconia has good corrosion resistance to chemicals such as acids and alkalis, making it widely used in the chemical industry. High hardness: Zirconia has a high hardness, close to steel, giving it good wear resistance in friction and wear environments. Excellent electrical properties: Zirconia is a dielectric with good insulation properties and is widely used in the insulation layer of electronic devices. Biocompatibility: Zirconia is widely used in the medical field because it has good compatibility with biological tissues and is suitable for use in medical devices such as human bone repair. High refractive index: Zirconia has a high refractive index, which makes it widely used in the optical field, such as optical lenses, laser devices, etc. Overall, zirconia is a multifunctional material...
There are several main ways to burn garbage fuel. Today we mainly introduce solid bed combustion and fluidized bed combustion. For different combustion methods, different types of refractory materials need to be selected. Solid bed combustion: During the solid bed combustion process of garbage, the fuel presents a static state in the furnace. This combustion method requires selecting refractory materials that can withstand high temperatures, and resist corrosion and wear, such as high-alumina refractory bricks, magnesia-aluminum refractory materials, silicon carbide ceramic materials, etc. Fluidized bed combustion: During the waste fluidized bed combustion process, the fuel is suspended in the furnace by the airflow and moves with the airflow. This combustion method requires selecting refractory materials that are resistant to wear, corrosion, and high temperature, such as high-aluminum refractory bricks, potassium aluminosilicate refractory materials, etc. In addition, factors such as the chemical composition, physical properties, and moisture content of waste fuel also need to be considered when selecting refractory materials. For example, if the garbage fuel contains high concentrations of elements such as sulfur and chlorine, you need to choose refractory materials with good corrosion resistance. If the moisture content of the waste fuel is high, refractory materials with good temperature...
Low creep and resistance to spalling are two important performance indicators of refractory bricks, and their meanings are as follows: Low Creep: Creep refers to the continuous deformation of materials caused by stress under high temperatures for a long time. In a high-temperature environment, refractory bricks will be affected by thermal stress, and creep is the continuous deformation of the brick material under the action of this stress. Low creep means that refractory bricks can maintain small deformation when used at high temperatures for a long time, reducing adverse effects on the kiln structure. Spall Resistance: Spall resistance refers to the ability of refractory bricks to resist peeling or chipping caused by thermal shock at high temperatures. Inside the kiln, due to high temperatures and thermal cycles, refractory bricks will withstand stress caused by thermal expansion and contraction and are prone to peeling or chipping. Refractory bricks with good spalling resistance can effectively resist such spalling and chipping, maintaining the integrity and stability of the lining. Low creep and resistance to spalling are important performance indicators of refractory bricks when used for a long time in high-temperature environments. Good refractory bricks should have low creep and good spalling resistance to...
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