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Castables are divided into two types. One is a material used in ordinary building materials to fill gaps and cavities in concrete structures. The other is refractory castables, which are mainly used for the construction of high-temperature kilns. A refractory material with a refractory index, the difference between the two is relatively large. Generally, the refractory properties of castables used in our ordinary construction sites are much lower than those used in high-temperature kilns. Castables are also called amorphous materials. They are generally fluid. Ordinary castables are mainly composed of cement, sand, stones, and other additives, while refractory castables are mainly composed of refractory aggregates, powders, and binders. of the mixture. Ordinary castables can only be used for building exterior walls of houses, so no special treatment is required, while refractory castables need to be formed by mixing different proportions of refractory materials. Because they contain refractory materials, their fire resistance is higher. Compared with ordinary castables, the refractory temperature of refractory castables can usually reach about 1700°C, and direct contact with flames is often required during the application process. The use of refractory castables and ordinary castables is not much different. They both need to add water or other...
High-alumina refractory castable is a very important refractory material, which is widely used in high-temperature furnaces, ironworks, the metallurgical industry, the glass industry, and other occasions that need to withstand high temperatures and chemical erosion. High-alumina refractory castables are popular for their high-temperature resistance, corrosion resistance, and long life. How much a ton of high-alumina refractory castables must be a concern for everyone. Generally speaking, the price of high-alumina refractory castables is in The price is around 1600-2500 yuan, but the specific price is affected by many factors. The price of high alumina refractory castables depends on several factors. First, the composition of the material is an important determining factor. High-alumina refractory castables are usually composed of different components such as high-purity alumina powder, high-purity alumina fine powder, and high-purity alumina medium particles. Different ingredients and proportions will have a direct impact on the performance and price of the castable. Generally speaking, the price of materials with purer ingredients will be relatively higher. Secondly, the brand and manufacturer of high-aluminum refractory castables will also have a certain impact on the price. There are many well-known brands of high-aluminum refractory castables on the market, each with its own unique process and...
A corundum heat storage ball is a high-aluminum heat storage ball. It is mainly used in aluminum melting furnaces. There are two materials: 92 and 95. The drop of the ball used in aluminum melting furnaces is especially 25mm. Some customers also choose 30mm. They are all customized according to actual usage needs. Today, the editor will take you into the factory of Henan Xinhongji Refractory Material Co., Ltd. for an on-site introduction. As a manufacturer of corundum heat storage balls, Henan Xinhongji Refractory Material Co., Ltd. is committed to providing high-quality corundum heat storage ball products. The company has a specialized R&D institution and continuously conducts technological innovation and process improvement on the production products to meet the needs of different high-temperature kilns. The use of furnaces makes the service life of corundum heat storage balls longer, reducing costs and increasing efficiency for enterprises. Henan Xinhongji Refractory Material Co., Ltd. attaches great importance to scientific research and innovation and continuously explores material formulas and manufacturing processes to meet the different needs of customers for corundum thermal storage balls. At the same time, the company also pays attention to environmental protection and sustainable development and actively promotes energy conservation and...
A cement rotary kiln is generally mainly composed of a tropical zone, decomposition zone, transition zone, firing zone, cooling zone, kiln mouth, and other parts. The refractory materials selected for the construction of these parts are also different depending on the temperature and purpose used. Today’s editor let me give you a brief understanding of how they choose refractory materials. 1. Preheating zone and decomposition zone The temperatures in these two places are relatively low, requiring the brick lining to have a small thermal conductivity and good wear resistance. In this area, alkali sulfate and alkali chloride from raw materials and fuels begin to volatilize, condense, and concentrate in the kiln, and penetrate the interior of the bricks. Ordinary clay bricks react with alkali to form potassium nepheline and leucite, which makes the brick surface brittle and causes the brick body to expand, causing cracking and peeling. Al2O3 25% ~ 28% and SiO2 65% ~ When about 70% of alkali-resistant bricks or alkali-resistant insulation bricks react with alkali at a certain temperature, a high-viscosity glaze layer will immediately form on the surface of the brick to prevent peeling, but this Bricks cannot withstand service temperatures above 1200 degrees Celsius. Therefore,...
Silicon carbide brick is a refractory material with SiC as the main raw material. Contains 72% to 99% SiC. Divided into clay bonding, Si3N4 bonding, Sialon bonding, β-silicon carbide bricks such as SiC bonding, Si2ON2 bonding, recrystallization, etc. Silicon carbide bricks have high thermal conductivity, good wear resistance, good thermal shock resistance, and corrosion resistance. It can be used for the lining of aluminum electrolytic cells, molten aluminum conduits, ceramic kilns, the lower part of large and medium-sized blast furnaces, furnace waist and bosh, the lining of aluminum refining furnaces, lining of zinc distillation tanks, etc. When purchasing silicon carbide bricks, many users cannot distinguish the quality of silicon carbide bricks and silicon carbide products due to lack of experience, so they often purchase substandard silicon carbide products, which greatly affects the service life of the kiln and increases the cost of the furnace. The investment in refractory materials has brought unnecessary losses to the enterprise. So how to distinguish the advantages and disadvantages of silicon carbide bricks? First of all, the size and specification of silicon carbide bricks should be accurate. The ratio of silicon carbide bricks is generally between 2.45 and 2.6. If the ratio is too small...
With the continuous progress of the production and use of refractory castable materials, the wear resistance and thermal shock resistance of refractory castable materials will be improved, and new refractory castable materials with excellent high-temperature strength, good thermal shock resistance, and corrosion resistance will be developed to improve cement kiln Lining life has become a new trend in the development of refractory castable materials. Measures to Improve the Wear Resistance of Refractory Castables 1. Reduce the critical particle size of the castable from 8mm to about 5mm. 2. Improve the medium-temperature thermal flexural strength of the castable. At a medium temperature of 900°C, the flexural strength of the castable indirectly reflects the wear resistance of the castable. The current development trend is that the thermal flexural strength of the castable is not less than 20mpa. 3. Improve the bonding ability of the castable matrix. It is prepared by multi-level micro powder and ultrafine powder to form a tight accumulation of Rongsheng refractory, promote medium-temperature sintering, and improve the bonding ability of the castable matrix. 4. Use high-hardness refractory raw materials as aggregate. Measures to Improve Thermal Shock Resistance of Wear-resistant Castables Using composite aggregate and composite powder (that is, composite...
1. Requirements for the environment when the gasifier is working Gasifier production is carried out at 1300-1400°C high temperature and high pressure (8.34MPa for large furnaces). Raw oil (heavy oil, residual oil, or crude oil) and oxidants such as oxygen and steam are sprayed into the furnace through nozzles for an incomplete oxidation (that is, combustion) reaction. The surface temperature of the gasifier is 80-120°C, and the maximum temperature shall not exceed 200°C. Generally, a surface temperature measuring device (thermistor) or color-changing paint is used. The inner shell is lined with refractory materials. In addition to the influence of changes in furnace pressure, operating temperature, and process gas on the life of refractory bricks, trace metals such as vanadium and nickel in raw oil have a great impact. The nozzle is the core component of the gasifier, which sprays raw material oil, oxygen, steam, and other oxidants into the furnace for reaction. There are many types, and the commonly used ones are two-casing external mixing type, three-casing type, and secondary airflow atomization double-casing nozzle. The structure of the gasifier itself is simple, but because the process gas contains hydrogen and carbon monoxide. Hydrogen has hydrogenation corrosion to the furnace body;...
Refractories are the lining of high-temperature kilns, which play a protective role in blast furnace hot blast stoves, ladles, and other equipment in the metallurgical industry. It can be said that without refractories, smelting equipment cannot operate. Refractories can prevent ladles from contacting molten steel and prolong The service life of the ladle is also very necessary to use refractory materials in the metallurgical industry. There are also many types of refractory materials used in the metallurgical industry. How to choose refractory materials used in metallurgical heating furnaces is also a science. Today I will take you to understand. When choosing bricks, we should pay attention to the following issues: First, we should be tailor-made, self-sufficient, pay attention to the characteristics of regional resources, and choose bricks reasonably. Secondly, consider the working characteristics of the furnace masonry to achieve the correct technology. Different styles of heating furnaces and different parts of the furnace body have different working conditions. Therefore, when using bricklaying materials, the characteristics of masonry work should be fully considered. The working temperature of different parts of the heating furnace is different, and the selection of masonry materials should choose products of different varieties and grades. For the...
Hot blast stoves generally use refractory bricks as the inner lining to withstand high temperatures and chemical corrosion. When choosing the type of refractory brick, two options are usually considered, andalusite brick and mullite brick. Andalusite bricks have high-temperature resistance and can withstand higher temperatures. They are often used in the internal lining of high-temperature industrial equipment such as hot blast stoves because of their stable performance under high-temperature conditions. As a high-temperature structural material, hot-blast stove bricks have very strict requirements for high-temperature creep rates. Andalusite, like sillimanite, has excellent high-temperature structural strength properties. The high-temperature creep rate of andalusite brick is better than that of bauxite, corundum, and most mullite bricks. Andalusite is one of the ideal materials for low-creep refractory materials. Mullite bricks are used in some specific cases as they perform better in chemically aggressive environments. Mullite bricks are relatively light and may be more suitable for some application scenarios that have restrictions on the weight of equipment. Using synthetic mullite and corundum as the main raw materials, adding sillimanite and andalusite, according to the production process of high alumina bricks, mullite hot blast furnace bricks are produced. Load softening temperature and creep properties are important...
The glass furnace is an essential thermal equipment for glass production. Its main responsibility is to melt the batch material into liquid glass during the glass production process, and it is also responsible for clarifying, homogenizing, and cooling it to the required temperature. , so the quality of the glass kiln affects the entire production process, and the refractory bricks used in building the glass kiln are also the key to affecting the service life of the glass kiln. Today, the editor takes the production of float glass as an example to introduce to you the Refractory bricks required in the process of building a glass furnace. The three major thermal equipment commonly used in the float glass production process are float glass furnaces, float glass tin baths, and glass annealing furnaces. These three kinds of kilns all need refractory bricks for the construction of the inner lining during the construction process, but because the temperature of each part of the kiln is inconsistent during operation, we must choose according to the temperature of the used part when selecting. 1. Silica bricks for glass kiln Silica bricks are often used in glass kiln arches, breast walls, and small kiln masonry....
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