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The lime kiln is mainly a kind of equipment used to produce industrial lime. Common kiln mouths include sleeve kiln, double-chamber kiln, double-beam kiln, rotary kiln, mixed-material vertical kiln, etc. The lime kiln is mainly composed of a kiln body, It is composed of a feeding device, material distribution device, combustion device, ash unloading device, electrical appliances, instrument control device, dust removal device, etc. When choosing refractory in lime kiln construction, it should be selected according to different kiln shapes and actual use conditions. Today, Xinhongji Refractory will briefly introduce which kind of lime kiln castable is better. Limekiln Lime calcining kiln has two types of kiln type: vertical kiln and rotary kiln. Generally, castables are used in the two positions of the lime rotary kiln preheater and the front and rear kiln mouths, but the two positions are based on the usage conditions. The castables used are different. 1. Refractory materials for the working layer: high alumina bricks (or clay bricks). The brick design of the rotary kiln is very important. In the high-temperature combustion section and the impact section of cloth feeding, refractory castables should be used instead of refractory bricks in the working layer, which have better...
Alkali-resistant refractory castable is a kind of refractory castable that can resist the erosion of metal oxides. It is mainly composed of refractory aggregate, binder aggregate, binder, and alkali-resistant agent. If it is divided by porosity If it is more than 45%, it is a light alkali-resistant refractory castable, and less than 45% is a heavy alkali-resistant refractory castable. Characteristics of alkali-resistant refractory castables 1. Good high-temperature performance; 2. Strong alkali resistance and corrosion resistance; 3. Can resist the erosion of sodium salt melt; Applicable scope of alkali-resistant refractory castable Alkali proof castables are mainly used in industrial furnaces with alkali corrosion in industries such as iron and steel, nonferrous metals, glass, machinery, and petrochemical industries. Among them, heavy alkali-resistant refractory castables are mainly used in the kiln tail, kiln head, preheater, discharge port, tuyere, and other parts of the calcined alumina rotary kiln and cement rotary kiln. Lightweight alkali-resistant refractory castable Zhu Yong is used for the top cover of the preheater, the cylinder, and the thermal insulation lining in the kiln of the above-mentioned rotary kiln. The main components of refractory castables 1. The chemical composition of light alkali-resistant refractory castables is generally: Al2O3 content of 30% to...
Honeycomb ceramic regenerator is a porous refractory material often used in industrial. It has many connecting honeycomb parallel channels inside. These honeycomb units are divided by lattice-like thin tap walls, which greatly improves the equipment of the equipment. Heat exchange efficiency is currently widely used in the energy saving of industrial thermal workers. It can effectively improve the efficiency of thermal workers and reduce energy consumption. At the same time, it can improve the overall production volume of thermal workers and improve the quality of the product. It is currently solving energy and quality. The main means of the environment. Features of honeycomb ceramic regenerator 1. Can effectively improve fuel utilization and reduce the energy consumption and exhaust heat loss of the unit. 2. It can improve the heat utilization rate and theoretical burning temperature of the fuel, improve the combustion conditions, and meet the high-temperature requirements of thermal equipment. 3. Improve the conditions for heat exchange in the furnace, and increase the production of equipment and the weight of the product. 4. Increasing fuel utilization, can reduce the discharge of exhaust gas for heat work equipment, reduce the emissions of harmful gases, and improve the environment. Application of honeycomb...
The bricks we usually use to build houses are ordinary red bricks, and the main purpose of refractory bricks is to build high-temperature furnaces, aluminum melting furnaces, and other high-temperature occasions. Although both are bricks, they are essentially the same. There is a big difference, let’s follow the Xinhongji Refractory today to see what the difference between the two is. First. The difference in shape and color From the appearance point of view, except for special-shaped refractory bricks, the shape of general right-angle brick refractory bricks is not much different from that of ordinary bricks, they are all rectangular, but the shapes of refractory special-shaped bricks are different, such as arch foot bricks, anchor bricks, etc., choose according to different usage occasions. Generally, most ordinary bricks are reddish-brown or gray, and the color changes according to the type of soil used in production. Natural refractory bricks are white, but due to the different metal content in the raw materials, the fired color is also different. Similarly, its colors are brown, moss green, red, and jet black. Second. Different usage occasions 1. The use occasions of refractory bricks are generally in the construction of high-temperature kilns and firewalls. Generally, the use...
The steel fiber reinforced corundum and high alumina refractory castables used for the kiln mouth of the rotary kiln are prone to cracking and peeling after many years of use, that is, the thermal shock resistance is not good and the service life is low. As we all know, the thermal shock resistance and alkali resistance of clay bricks are better than those of high alumina bricks because of the low aluminum content; high strength, good wear resistance, and poor shock resistance. In castables for kiln mouth, the Al2O3 content is 50% to 70%, the strength is moderate (both wear resistance and thermal shock resistance are considered), and the drying and compressive strength (1100°C) are about 40MPa respectively. and 70MPa. It should be pointed out that refractory castables are composed of aggregates, powders, binders, and admixtures (materials). The phase composition in the matrix before use is in a non-equilibrium state. A new phase equilibrium will be reconstituted according to the phase equilibrium relationship (that is, to obtain excellent performance and in-situ reaction). Therefore, suitable constituent materials should be selected and the batching design should be optimized to achieve good sinterability, volume stability, corrosion resistance, and high-temperature mechanical properties. Selection of...
Refractory brick is a kind of refractory material used to build smelting furnaces and combustion kilns. It is made of refractory clay or other refractory raw materials. It can withstand high temperatures of more than 1700 degrees. The size of refractory bricks is very large. Choose according to different use environments. Generally speaking, refractory bricks can be divided into shaped refractory bricks and unshaped refractory bricks. 1. Shaped refractory bricks Shaped refractory bricks are generally fixed in size, also known as general refractory bricks. General refractory bricks are divided into five types: straight bricks, thick wedge bricks, vertical thick wedge bricks, vertical wedge bricks, and arch foot bricks. It is generally used for the masonry of right-angled walls and radial walls of thermal equipment in industrial kilns. Usually, the common specifications of shaped refractory bricks are G-shaped bricks and T-shaped bricks. 1. The common straight bricks in our life, their common sizes are: 230*114*65mm, 230×150×75mm, 345×150×75mm, 230×150/135×75mm, 345×150/130 ×75mm, 230×150/120×75mm, 345×150/110×75mm. 2. The common sizes of wedge-shaped refractory bricks that are common in our daily life are: 114×65/35×230mm, 114×65/45×230mm, 114×65/55×230mm, 114×55/45×230mm, 114× 75/45×230mm, 114×75/55×230mm, 114×75/65×230mm, 114×70/60×230mm, 114×85/55×230mm, 114×80/50×230mm. 3. The common sizes of arch foot bricks in our life are:...
Castables, also known as refractory castables, are composed of three parts: cement, aggregate, and admixture, and sometimes a glue accelerator is added. It is a granular and powdery material made of refractory materials and a certain amount of binder. It has High fluidity, and unshaped refractory material formed by casting. Refractory castables are usually classified according to the size of the porosity, the selected binder or bonding method, the type of aggregate, and the construction method. 1. According to the classification of cementation, refractory castables can be divided into hydration-bonded refractory castables, chemically bonded (including polymerization bonded) refractory castables, refractory castables combined with hydration and polymerization (typical representatives are low cement bonded refractory castables) There are four types of refractory castables combined with condensation. 2. According to whether the refractory castable contains cement or CaO content, it can be simply divided into four categories: ordinary refractory castable, low cement refractory castable, ultra-low cement refractory castable, and cement-free refractory castable. The castables produced by Xinhongji Refractory include non-stick aluminum castables, anti-seepage castables, self-retained high-temperature high-strength wear-resistant castables, lightweight thermal insulation castables, corrosion-resistant heavy castables, steel fiber castables, castable prefabricated parts, corundum mullite castables, silicon carbide castables.
Refractory material is an important industrial material, which is widely used in metallurgy, the chemical industry, construction, and other fields. At present, China is the world’s largest refractory producer and one of the major exporters. China’s refractory materials are mainly exported to Asia, Europe, North America, and other regions. Among them, the Asian region is the region with the largest export volume of refractory materials in China, mainly including India, Japan, South Korea, Pakistan, and other countries. Europe is also an important export destination of Chinese refractory materials, mainly including Germany, Britain, France, Italy, and other countries. In addition, China’s refractory materials are also exported to the United States, Canada, and other countries in North America. There are many reasons for the large export volume of China’s refractory materials. First of all, China has abundant resources of refractory materials, such as kaolin, bentonite, graphite, etc., which provide a basic guarantee for the production of refractory materials. Secondly, China’s refractory production technology is quite mature, the product quality is stable and reliable, and the price is relatively low, which makes Chinese refractory materials a competitive advantage in the international market. In addition, China’s refractory production enterprises are large in scale and...
The refractory material of the gasifier can be divided into three parts: the cone bottom, the cylinder body, and the vault. There is a certain expansion space between the vault and the furnace shell so that the lining refractory bricks expand upward when the gasifier is running. It can be divided into several layers from the inside to the outside. Taking the cylindrical refractory material as an example, it is divided into four layers: fireproof refractory material layer, backing layer, heat insulation layer, and compressible layer (the vault is the same as the cone bottom), the front An expansion gap of 3~5mm is reserved between the three layers. Expansion in the convenient radial direction is unrestricted. 1. Refractory bricks facing the fire The working environment of refractory bricks is very poor, and design units and users are very cautious about their structural design and material selection. A fireproof surface refractory layer: also known as hot surface brick, is a high-temperature-resistant, corrosion-resistant consumable layer. Typically, high chromium materials are required, which require high-temperature chemical stability, high creep strength, and thermal shock resistance. The thickness from the cylinder to the fire surface of the CWS gasifier is about 230mm. Use 90 chrome...
Alkaline refractory castables are castable refractory materials mainly composed of magnesium oxide, which is divided into basic castable materials such as magnesium, aluminum magnesium, spinel, magnesium, magnesium silicon, and magnesium carbon. Magnesia (periclase) refractory castable is made of fused magnesia or sintered magnesia aggregate and fine powder. The magnesia refractory castable combined with high magnesium cement has high purity, and a small line change rate after burning, It has the advantage of high softening temperature under load, but with the increase of heat treatment temperature, especially between 400~1200°C, the cementation will be lost due to the dehydration of magnesium hydroxide generated by the hydration of magnesia, and the combination of refractory aggregate and powder Very loose, and the solid phase reaction is very weak, resulting in a sharp drop in the strength of the refractory castable, prone to loosening and peeling. Magnesium refractory castables combined with water glass have the advantages of high strength, strong corrosion resistance of alkali and sodium salt melts, etc. However, due to the use of water glass as a binder, a large amount of sodium oxide or potassium oxide and silicon dioxide are brought in, which greatly reduces the refractoriness and load softening temperature of...
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