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Steelmaking mainly uses semi-acid raw materials (mainly refractory clay): In the previous classification, clay was listed as acidic raw materials, which is inappropriate. The acidity of refractory raw materials is based on free silica (SiO2). The reasons are as follows: 1. Because according to the chemical composition of refractory clay and siliceous raw materials, the free silica in refractory clay is much less than that of siliceous raw materials. 2. Because there are 30% to 45% alumina in general refractory clay, alumina is seldom in a free state, and it must be combined with silica to form kaolinite. Even if there is a small amount of excess silica, the effect is also Very small. 3. Therefore, the acidic properties of refractory clay are much weaker than those of siliceous raw materials. Refractory clay decomposes into free silicic acid and free alumina at high temperatures, but it does not remain unchanged. Free silicic acid and free alumina will combine to form Yinglai stone when it continues to be heated. Yinglai stone has good acid resistance to alkaline slag. At the same time, due to the increase of alumina content in refractory clay, its acidity gradually weakens. When the alumina reaches 50%,...
Non-stick aluminum castable is a commonly used unshaped refractory material in aluminum smelting equipment. First, let’s introduce what are the main influencing factors on unshaped refractory materials during the aluminum smelting process. First of all, liquid aluminum easily penetrates refractory materials. Secondly, liquid aluminum and alloying elements have a strong reducing ability to some oxides, which eventually leads to the deterioration of refractory materials, loose structure, and damage. Third, the addition of aluminum ingots and alloy blocks will impact and wear the furnace bottom and furnace wall, and finally, the temperature fluctuation in the furnace will cause thermal shock damage to the refractory lining. It is required that the non-stick aluminum castable has better resistance to aluminum liquid and corrosion, wear, and thermal shock of alloy elements. Non-stick aluminum castables add components that can effectively limit the penetration of aluminum liquid in the material design, such as graphite silicon carbide, silicon nitride, and aluminum borate, etc., through the optimization of corundum refractory materials, improve its density and optimize the matrix part The use of composite artificial synthetic materials from universities can effectively control the infiltration of aluminum liquid and improve the penetration resistance and corrosion resistance of non-stick aluminum castables....
The foundry is a production plant used for forging various metals. In the forming process of heavy metals in the forging process, high-quality refractory materials are inseparable. Among them, the use of refractory bricks is very important. It is very important for building the refractory layer of casting furnaces. An important refractory material. High-temperature refractory bricks commonly used in foundry furnaces include silica bricks, high-alumina bricks, corundum bricks, magnesia bricks, magnesia-alumina bricks, etc. High-temperature refractory bricks have excellent high-temperature refractoriness and can withstand the impact of flames and molten metals in high-temperature environments. It can make the forging process more stable and reliable. High-temperature refractory bricks also have good thermal shock resistance. During the casting process, it is often necessary to perform frequent heating and cooling operations on the furnace. The temperature difference between the inside and outside of the furnace is huge. Due to the poor thermal conductivity of ordinary masonry, it is easy to crack due to thermal stress caused by temperature changes. The unique material composition and structural design have excellent thermal shock resistance and can remain intact in environments with rapid temperature changes, thus ensuring the smooth progress of the casting process. High-temperature refractory bricks also...
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;...
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