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Two main factors cause damage to the cast material of the permanent lining of the ladle. First, repeated use produces excessive cracks. This is caused by the excessive shrinkage of the pouring material itself or the excessive linear shrinkage of the pouring material. The cracks expand after repeated use; when pouring in sections, the pouring material is not integrated at the joints, resulting in horizontal cracks. Cracks and cracks expand during use; the asbestos board near the steel shell has gaps after repeated use, releasing permanent lining stress and expanding cracks. Second, surface damage occurs due to insufficient strength of the casting material when disassembling the can. A comparative test of different water addition amounts on low-cement high-aluminum permanent lining castables found that: As the amount of water increases, the porosity of low-cement high-aluminum castables shows an upward trend, and the bulk density shows a downward trend, thereby reducing the compressive strength and flexural strength of the castables. Through multiple comparative tests, it can be seen that as the amount of water added increases, the shrinkage rate of the castable material line increases significantly, which will expand the shrinkage cracks produced during the use of the castable material. When the...
In principle, high-aluminum refractory balls cannot be watered, because watering will reduce the strength of the refractory balls. Reducing the strength will naturally affect the service life. However, the high-aluminum refractory balls currently shipped from the factory are slightly sprinkled, because the refractory balls just out of the kiln must be packed in ton bags for delivery or storage. However, after the refractory balls are sintered at high temperature since the tunnel kiln for burning refractory balls is shorter than the kiln for burning high-alumina bricks, the refractory balls will be hot when they first come out of the kiln, and the packaging will burn out the outer packaging, so there will be a slight sprinkle of water. This makes it easy to load large bags. However, it is not allowed if the water pipe directly sprays water onto the high-aluminum refractory sphere. This will reduce the strength of the refractory sphere and may cause cracking and affect the service life. To increase the weight, some unscrupulous salesmen increase the weight of the refractory balls by sprinkling water for profit so that the refractory balls cannot be thrown underground and cause breakage, so special attention should be paid to this...
Special-shaped refractory bricks are a common shaped refractory product. Compared with standard refractory bricks, they are refractory bricks with unconventional shapes. Special-shaped refractory bricks of various shapes and materials can be produced according to user needs. Today, the editor of Xinhongji Refractory will explain the special-shaped refractory bricks from several aspects: let you understand the standard-shaped refractory bricks and the special-shaped refractory bricks. 1. Special-shaped brick material The materials of special-shaped refractory bricks can be customized according to user needs, such as clay special-shaped bricks, high-aluminum special-shaped bricks, aluminum-carbon special-shaped bricks, magnesia-carbon special-shaped bricks, corundum special-shaped bricks, etc. The specific material still depends on in terms of user needs. According to the refractory material standards, for high-quality, high-aluminum special-shaped refractory bricks, the ratio of their overall dimensions (the ratio of the minimum size to the maximum size) is within the range of 1:5; and they have no more than 2 concave corners (including High-alumina refractory bricks with arcuate concave corners included), or with an acute angle of 75°, or with no more than 4 grooves. 2. Special-shaped brick shape Special-shaped bricks are refractory bricks with complex shapes. It is also a general term for refractory bricks of various shapes. Therefore,...
The regenerative ball is a kind of refractory material that can store and release energy, which is mainly used in hot blast stoves, heating furnaces, and smelting furnaces in the metallurgical industry. It can support and cover the catalyst in the reactor in the furnace. Function, It covers the top of the catalyst and can effectively buffer the impact of liquid and gas on the catalyst, thereby improving the distribution of liquid and gas in the reactor. Therefore, the role of the heat storage ball in a high-temperature kiln is also very important. However, if it is in contact with the flame for a long time, the heat storage effect of the heat storage ball will decrease over time. The decrease in the heat storage effect will also cause the coke ratio to increase. High, and long-term use of the heat storage balls will cause bonding, which will lead to poor air permeability of the hot blast furnace, high wind resistance, reduced blast furnace air inlet volume, and reduced blast furnace output. Therefore, we must regularly check the heat storage balls in the high-temperature kiln. Replace it, but how often should the heat storage ball be replaced? According to the...
There are many types of refractory bricks, including high alumina bricks, lightweight insulation bricks, clay bricks, etc. However, in terms of size, there are many sizes of refractory bricks. The general standard size of refractory bricks is 240mm*115mm*53mm. There are also Other less commonly used sizes, although the sizes are different, are all boxy. Special-shaped bricks generally refer to refractory bricks of different shapes that are irregular in shape and customized according to the specific needs of use. It is also a type of refractory brick, but its shape is irregular compared with ordinary refractory bricks. The difference between refractory bricks and special-shaped bricks 1. Different shapes The shapes of special-shaped bricks are all kinds of strange, and they are generally customized according to the needs of on-site use, such as trapezoidal, round, etc. They require additional grinding tools, and generally, they are customized according to the specific shape by opening a mold, and refractory The shape of the brick is relatively fixed, and there is no need to open a separate mold. The shape is a relatively conventional rectangle, so there is a big difference between the two in appearance. 2. Different uses Refractory bricks generally have regular shapes...
A thermal storage ball is a kind of refractory sphere that is widely used in high-temperature kilns and can store and release heat. It is the filling material in the thermal storage system and is often used to store and release energy in the thermal storage system. To improve the utilization rate of heat in the thermal storage system. There are many heat storage ball manufacturers on the market now, but it is not easy to choose a regular manufacturer with good product quality. How to choose a heat storage ball manufacturer, First of all, we need to consider the qualification and reputation of the heat storage ball manufacturer. We need to choose those manufacturers with good reputations and rich experience. The heat storage balls produced by these manufacturers have passed professional testing and the quality is guaranteed. At the same time, these manufacturers also have perfect after-sales service, which can provide customers with timely technical support and after-sales service. Secondly, heat storage ball manufacturers have their production bases. We can go to the factory for on-site inspections. Generally speaking, through on-site inspections, we can roughly see the strength of the manufacturers, the production process, and the product quality of...
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...
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