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Industrial waste incineration rotary kilns are prone to temperature fluctuations during operation. Rotary kiln refractory materials must not only have good fire resistance and wear resistance but also have good thermal insulation properties and resistance to rapid cooling and heating. Moreover, due to the complex composition of incinerated waste, it has a strong corrosive effect on refractory materials. Due to these reasons, the refractory bricks of the rotary kiln are prone to cracking after running for some time. The cracks in the bricks loosen, causing different steps between the rings and falling off. The service life and spalling of rotary kiln refractory materials are key issues that directly endanger system reliability and safe operation. To address these issues, the following specific measures can be taken: 1. The refractory materials are effectively configured according to the internal combustion conditions and harsh environment of the rotary kiln. In the garbage input part of the incinerator, since the garbage input and sliding need contact materials, and the temperature of the input port changes frequently, the refractory material is required to have excellent wear resistance and thermal shock resistance. Wear-resistant castables or wear-resistant chrome corundum bricks can be used, when there is a large...
Refractory cement is a special type of cement with high-temperature resistance and is commonly used in construction, industrial equipment, and furnace linings in high-temperature environments. The main components of refractory cement are cement clinker, silicate, aluminate, and other substances. Refractory cement has good fire resistance and is therefore widely used in the construction of high-temperature kilns. Features of refractory cement 1. Good high-temperature resistance: The main feature of refractory cement is its ability to maintain stable performance in high-temperature environments, and can usually withstand high temperatures up to 1500°C. 2. Good chemical corrosion resistance: Refractory cement contains a large amount of chemical components such as alumina and silicon oxide, which can resist the erosion of strong corrosive substances such as acids and alkalis. 3. High compressive strength: Refractory cement has high compressive strength and can withstand greater pressure, so it is widely used in construction, metallurgy, and other industries. 4. Refractory cement has strong plasticity: Refractory cement has good processing properties and can be made into refractory products of various shapes and sizes through different processing techniques. Refractory cement is widely used in construction, metallurgy, chemical industry, electric power, and other fields. In the field of construction, refractory cement is...
Lime kilns are mainly divided into square kilns and round kilns. According to the classification of fired products, there are lime kilns and ceramic kilns. It is divided into a preheating zone, a firing zone, and a cooling zone. The operating temperature of the preheating belt on the top of the lime kiln is not very high, but when firing products, the raw materials are easy to cause great wear and tear on the refractory bricks, and the furnace gas will cause serious chemical erosion of the refractory bricks. Therefore, attention must be paid to the strength, density, wear resistance, and corrosion resistance of refractory bricks. Although the preheating zone does not have high-temperature requirements for refractory bricks, the other performance requirements for refractory bricks are very strict. Many factories use high alumina bricks and clay bricks, which are different. Calcining area. The calcining zone is the area with the strongest chemical reaction of the refractory bricks used in lime kilns, and the calcining zone is also the stage with the highest temperature. So be careful when you have bricks. Has good thermal shock resistance, corrosion resistance, and wear resistance. Use dense high alumina bricks. The calcining zone was initially...
As we all know, the purpose of adding steel fibers to castables is to improve the mechanical properties of the castables, inhibit the occurrence of cracks, or limit the expansion of cracks when they are formed. Prefabricated blocks of castables made of refractory materials such as steel fiber castables can be made into a certain shape according to the process location and needs, and are heat treated according to the working conditions after demoulding. Precast castable blocks have better application performance and construction advantages than ordinary corresponding castables. Its main features are: 1. Compared with ordinary products, castable prefabricated blocks have higher compressive strength, which is increased by about 2 times. 2. Good thermal shock resistance: The thermal shock resistance of castable prefabricated blocks is increased by 8 to 10 times. 3. The wear resistance of prefabricated blocks is better than that of castables of the same material. 4. Save masonry time, no on-site pouring, supporting, and dismantling of molds, and no need for construction machinery. Once the molded parts arrive at the site, they only need to be installed and assembled on-site, which is convenient and fast. The on-site construction process time is greatly reduced, the quality is stable,...
There are many types of unshaped refractories, which can be classified according to the materials or binders used. According to its process characteristics, it can be divided into castable materials, ramming materials, spray materials and refractory mud. Broadly speaking, refractory coatings are also considered unshaped refractory materials. The chemical and mineral composition of unshaped refractory materials mainly depends on the granular and powdery refractory materials used. It is also closely related to the type and amount of adhesive used. The density of a structure or product made of unshaped refractory materials is primarily related to the constituent materials and their proportions. At the same time, much depends on the construction method and craftsmanship. Generally speaking, compared with sintered products of the same material, most amorphous refractory materials have higher porosity before sintering or even after sintering due to smaller external forces during the forming process; chemical reactions before sintering may change the structure or product Some properties, while some medium temperature strength may be slightly reduced due to the presence of non-high temperature stable materials such as binders, the volume stability at high temperatures may be slightly lower, the porosity may be higher, and the corrosiveness may be lower, but...
Castables are granular and powdery materials made by adding a certain amount of binder to refractory materials. They have high fluidity and can be cast into shape. Refractory castables have certain requirements on the surrounding environment during the construction process. Now Xinhongji Refractory will briefly introduce the precautions for the construction of refractory castables in winter, summer, and rainy days. 1. Winter construction refers to construction where the ambient temperature is between +5℃ and -5℃. When the temperature is below -5°C, reliable cold protection measures must be taken before construction can begin. 2. Winter construction techniques must be used during winter construction. The working environment should be sealed, windproof, and warm, and the lining temperature should be kept above +5°C after masonry construction. 3. When constructing castables in winter, dry materials should be stored in the heating room and mixed with boiling water. The temperature of the mixture should be maintained above 10°C. It is not advisable to add chemical accelerators or antifreeze. 4. When constructing the furnace in winter, the insulation layer should be built first to mobilize the anti-freeze ability of the refractory layer. After the masonry is completed, it should be covered first with plastic sheeting and...
What is the refractory material of a cupola furnace? A cupola furnace, also known as an iron furnace or stir-fry furnace, is mainly used for ironmaking. The working temperature of the cupola furnace is generally 1400~1600℃. The cupola furnace body consists of a furnace bottom, a furnace body, a forehearth, and a bridge. The bottom of the cupola furnace is in direct contact with the molten iron and is responsible for the quality of all charges. Therefore, ASC ramming materials or carbon ramming materials and products should be used to improve the service life of the cupola furnace bottom. The upper working layer of the cupola furnace body is affected by the impact and wear of the feeding machine. It is built with fan-shaped hollow iron bricks and filled with quartz sand outside. The lower working layer of the cupola, especially the burning area above the tuyere, has a higher temperature and is corroded by slag, airflow, and charge. Therefore, magnesia chrome bricks or magnesia bricks with strong corrosion resistance are used. Since the oxidation atmosphere of the working layer in the lower part of the furnace body is weakened, ASC ramming materials and their products can be used. Due...
There are many types of bricks. We usually confuse refractory bricks and red bricks, mainly because they are the same in appearance. However, the difference between refractory bricks and red bricks is still very big, which is mainly reflected in The colors, specifications, materials, production processes, uses, etc. of the two are different. Today I will take you to understand the difference between refractory bricks and red bricks. When it comes to refractory bricks and red bricks, some people still can’t tell the difference. There are obvious differences in the appearance colors of refractory bricks and red bricks. Let us introduce the difference between refractory bricks and red bricks in detail. 1. Color: Refractory bricks are mainly yellow and beige, while red bricks are red. 2. Specification: Generally speaking, the specification of refractory bricks is T3, which is 230*114*65 mm. The commonly used red brick specification is 200*100*50mm. 3. Production: Generally speaking, refractory bricks are fired at the above-mentioned high temperature of 1200°. Red bricks are fired at around 800-1000°. 4. Uses: Refractory bricks can be used as high-temperature building materials, used in building kilns and thermal equipment, and can withstand physical and chemical changes and mechanical effects at high...
Fire resistance is an irregular refractory material. It is an important refractory material. It is a refractory material for high-temperature kiln castables’ inner lining. The density of fire-resistant castable materials, also known as volume density, is one of the important testing items in refractory castable cooking indicators. The volume density index of refractory watering is a comprehensive reflection of the volume of air pores and minerals in the castable material. Generally, the volume density reflects the density of refractory castables after castable water. The volume density of fire-resistant castable materials is g/cm3. Generally speaking, the volume density range of refractory castable materials is 0.4-3.4. The larger the volume density, the higher the volume density of the castable material. The castable material can better resist the erosion of the external slag in the castable inner lining, and the gas tightness of the castable inner lining is better. Depending on the materials, the refractory watering materials are divided into clay castable materials, high aluminum castable materials, Mo Lai stone castables materials, rigid jade castable materials, silicon castable materials, magnesium castables materials, low cement castable materials, wear-resistant castables materials, steel fiber castables Fire -resistant castables materials such as materials. The volume density of...
Transportation of refractory materials and refractory products 1. All refractory materials and refractory products must have factory certificates that meet the design technical conditions. One month before furnace construction, copy the factory test reports of all refractory materials and submit them to the metallurgical furnace major of the design institute or the working group of the design institute on the construction site. Before the product leaves the factory, it should be accompanied by a quality certificate, indicating the product name, brand, inspection results, and factory list (brick number, quantity, factory date, and train number). The shipment and use of refractory materials without product certificates is strictly prohibited. 2. The means of transportation (trains, cars, ships, etc.) for refractory materials and refractory products must be cleaned before shipment and must not be contaminated by oil or other impurities. Refractory materials must be protected from rain and snow during transportation to prevent rain and rainwater from entering. 3. Various clay bricks, high alumina bricks, lightweight bricks, and lightweight standard bricks should be packed in containers or other solid packaging before transportation; standard clay bricks and ordinary clay bricks can be wrapped with straw ropes before transportation. During transportation, care should be taken...
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