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Rotary kilns are widely used in building materials, metallurgy, chemical industry, and environmental protection industries, mainly for mechanical, physical, or chemical treatment of solid materials. Among them, the rotary kiln is widely used in the cement industry, and usually processes cement, lime, and other materials commonly used in construction, as well as materials that are difficult to calcinate. The rotary kiln mainly includes the kiln head and the kiln tail. The use occasions of the kiln head and the kiln tail are different, and we are also different when choosing refractory castables. So today Xinhongji Refractory will briefly analyze the castables for the rotary kiln head. The kiln head of the rotary kiln is mainly used for discharging materials. The high temperature generated by the calcination of the materials inside the equipment can be cooled by the kiln head cooler, and then transported to the clinker bin for storage or transportation. There are many types of rotary kilns, and the temperature is different when calcining different materials. Among them, the temperature of our common cement rotary kiln can reach about 1600°C during calcination; the temperature of the ceramsite sand rotary kiln can reach 1050°C during operation; the temperature of the...
Chrome corundum brick is a commonly used high-temperature refractory material, but it is prone to thermal shock cracks at high temperatures, which affects its service life. The following are several ways to improve the thermal shock stability of chrome corundum bricks: Optimizing the formula: adjusting the raw material ratio and particle size distribution of chrome corundum bricks, selecting suitable binders and additives, and optimizing the formula can improve the structure and performance of chrome corundum bricks and improve their thermal shock stability. Adding micro powder: Adding a certain proportion of micro powder to chrome corundum bricks, such as microcrystalline oxide, micron silicon powder, etc., can change the microstructure and porosity of chrome corundum bricks and increase their thermal shock stability. Adopt permeable structure: Apply permeable structure to the production of chrome corundum bricks, that is, spray or impregnate certain materials on the surface of chrome corundum bricks to penetrate into the inside of the brick body, thereby forming a certain permeable layer and increasing its thermal shock stability sex. Composite structure: In the production of chrome corundum bricks, a composite structure is adopted, that is, the surface of chrome corundum bricks is covered with a layer of other high-temperature refractory...
Refractory bricks used in cement kilns include fire clay bricks, high alumina bricks, magnesia alumina spinel bricks, magnesia iron spinel bricks, magnesia chrome bricks, silica mullite bricks, etc. Refractory bricks have certain refractoriness and can withstand corrosion and impact in high-temperature environments. Ordinary refractory bricks are mainly used to build the kiln wall, kiln roof, kiln bottom, kiln head, and other parts, which can effectively protect the cement kiln from the corrosion and erosion of high-temperature flue gas and raw materials. Magnesia-aluminum spinel refractory brick: made of alumina, bauxite, spinel, and other materials, it has a high heat resistance and resistance to cold and heat cycles. High alumina spinel refractory bricks are used in the feeding port, cooling zone, kiln shell, and other parts of the cement kiln. Due to the impact and corrosion of high temperatures, the stable operation of the equipment is guaranteed. According to different use parts and working environments, cement kiln refractory bricks should be built with refractory bricks of different materials and properties. Quality requirements for refractory bricks and other lining materials used in cement kilns The refractory bricks and other lining materials built in the cement kiln shell must meet the following requirements: (1)...
Silica mullite bricks are widely used in some high-temperature industrial equipment. Due to its composition and preparation process, silica mullite bricks generally have the following characteristics and uses: High-temperature resistance: Silica mullite bricks can withstand high-temperature environments and maintain the stability and durability of the structure. It can provide good protection in high-temperature furnaces and furnace walls. Corrosion resistance: Silica mullite bricks have good corrosion resistance in the face of a chemical attack. It is resistant to acidic and alkaline substances and is suitable for environments requiring protection against corrosive gases and liquids. Anti-wear properties: Silica mullite bricks usually have good anti-wear properties, which can resist the erosion and wear of materials. This makes it widely used in industrial equipment that needs to be resistant to wear. The load-softening temperature of silica-mole bricks is above 1550°C, especially the compact structure of the product, which is composed of high-hardness minerals, corundum, silicon carbide, and mullite. It has particularly good wear resistance and is an ideal brick for the transition zone. The compressive strength and load softening temperature are significantly higher than the spalling-resistant high-alumina bricks. Its thermal shock stability, corrosion resistance, wear resistance, and low thermal conductivity are exactly what the...
To improve the operating life of waste incinerators, the following measures can be taken: Choose the right refractory material: Refractory materials used in waste incinerators need to have high-temperature resistance, corrosion resistance, and impact resistance. Choose high-quality refractory materials, such as high-alumina bricks, acid-resistant ceramics, etc., to ensure their stability and durability under high temperatures and corrosive environments. Optimizing the combustion process: A reasonable combustion process can reduce corrosion and thermal stress in the waste incinerator, thereby prolonging the service life of the furnace body. Reduce damage to refractories by optimizing combustion parameters, controlling combustion temperature and gas distribution, etc. Furnace protection measures: Use refractory materials such as ceramic bricks and refractory castables to protect the furnace wall in the garbage incinerator. In addition, metal covering or coating can be used to increase the anti-corrosion layer on the surface of the furnace body and improve the corrosion resistance of refractory materials. Regular maintenance and overhaul: Regular maintenance and overhaul of waste incinerators, including furnace body cleaning, refractory repair, replacement, etc. Timely deal with problems such as ash accumulation and slagging in the furnace to prevent erosion and damage to refractory materials. Control the chemical reaction in the furnace: For the...
Electric kiln is a device that uses electric energy as a heating source. Corundum brick is a high-performance refractory brick made of corundum and other refractory materials, which can be used for a long time at a high temperature of 1600 degrees. Electric kilns are often used in processes such as high-temperature sintering, melting, and heat treatment. Since the working temperature of electric kilns is usually high, reaching or even exceeding 2000 degrees Celsius, it is necessary to use refractory materials that can withstand high temperatures. Corundum bricks are widely used in the lining of electric kilns because of their excellent high-temperature performance. Corundum has a melting point of more than 1900 degrees and good high-temperature resistance and can maintain stability in high-temperature environments. Corundum brick not only has good refractory performance, but also has high thermal conductivity and excellent wear resistance, and can withstand high temperatures and chemical corrosion inside the electric kiln. Corundum bricks are commonly used in the inner wall of the furnace cavity, furnace bottom, and furnace roof in electric kilns. They effectively insulate the high temperature inside the cavity, provide even heat distribution and protect the structure of the cavity from damage. It should be...
The heating furnace is mainly composed of a regenerator that is insulated by refractory materials, a furnace body that supports and transports heating elements, a furnace body, and a heat recovery system. The heating furnace uses oil, natural gas, electricity, and coal as the main fuel as the heat source. Of course, the furnace temperature and pressure can also be controlled manually. The main function of the heating furnace is to heat the billet (billet, bloom, slab, ingot) to 1000-1250°C (rolling temperature) until it has enough plasticity to be rolled to the desired Section, size, or shape. Depending on the chemical composition and grade of the material, the required rolling temperature also changes. Depending on the metallurgical properties of the raw material and the productivity, the heating rate of the furnace is also adapted to meet specific requirements and goals. During furnace processing, a stream of material runs continuously through the furnace, heating the raw material to a certain temperature. The heating furnace is divided into continuous heating furnaces, push steel heating furnaces, regenerative heating furnaces, and roller bottom heating furnaces. Depending on the heating capacity, material grade, and material shape, choose the appropriate furnace type. Furnaces used for the...
Lightweight refractory materials are widely used in modern industrial production and construction industry because of their many advantages, such as low density, high-temperature resistance, corrosion resistance, heat insulation, etc. Different lightweight refractory materials have different properties and use. First of all, we need to know what lightweight refractories are. Lightweight refractory materials can be divided into two types: organic and inorganic. Organic materials mainly refer to materials made by adding lightweight aggregates based on organic adhesives. Inorganic materials are based on refractory materials and processed by adding foaming agents and other auxiliary materials. Inorganic lightweight refractories usually use materials such as fire clay or ceramsite as the basis, which can maintain stability at high temperatures. Next, we need to know the application range of lightweight refractories. Lightweight refractories can be widely used in petroleum, chemical, metallurgy, machinery, ceramics, glass, and other industries. In the construction industry, lightweight refractory materials are also used for thermal insulation and fire protection. For example, the use of lightweight refractory materials on top of buildings can protect buildings from fire. Among lightweight refractories, perlite bricks are a better choice. Perlite brick is a new type of lightweight refractory material, which is mixed with perlite, diatomaceous...
In the production process of titanium dioxide, multiple high-temperature equipment and reactors are involved, and some refractory materials are required to withstand high temperatures and chemical corrosion. Here are some refractory materials that may be used: Titanium dioxide calcination kiln: The calcination kiln is used to calcine the titanium dioxide precursor material at high temperatures to form the final product of titanium dioxide. Refractory materials are used in the lining, furnace wall, and combustion chamber of the kiln to resist high temperatures and chemical erosion. Reactor: In the process of titanium dioxide production, some reactors may be involved, such as chlorination reactor and titanium sulfate reactor. These reactors usually require the use of refractory materials to construct parts such as lining, reaction chamber, and outlet to withstand the corrosion caused by high temperature and chemical reactions. Filters and Dryers: In titanium dioxide production, filters and dryers may be required to handle and separate solid particles. The interior of these devices may require the use of refractory materials to withstand high temperatures and particulate attacks. Conveying pipelines and storage equipment: During the production process of titanium dioxide, pipelines, and storage equipment are needed to transport and store raw materials and finished...
The main reason why high-temperature industrial kilns need to use insulation materials is to reduce heat energy loss, improve energy utilization efficiency and protect equipment structure. The following are several important functions of insulation materials in high-temperature industrial furnaces: Reduced thermal energy loss: High-temperature industrial furnaces often need to operate at very high temperatures, while the surrounding environment may be room temperature or cooler. Insulation materials can effectively reduce the loss of heat energy to the surrounding environment through conduction, radiation, and convection, thereby reducing energy consumption. This reduces fuel consumption and running costs. Energy saving: By using ideal insulation materials, the high temperature inside the kiln can be better kept within the required process temperature range. The thermal resistance performance of the insulation material can reduce the loss of heat, so that the kiln can maintain a stable operating temperature with lower energy input, thereby improving energy utilization efficiency. Environmental protection: High-temperature industrial kilns usually produce a lot of waste heat and exhaust gas. Thermal pollution to the environment can be reduced by using thermal insulation materials to reduce thermal energy loss. In addition, the insulation material can also reduce the temperature of the outer surface of the kiln...
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