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Application of Unshaped Refractories in Blast Furnace
Application of Unshaped Refractories in Blast Furnace
1 The Characteristics of Unshaped Refractories Commonly Used in Blast Furnaces
Compared with the molded refractory material, the overall combustion process is cancelled during the manufacturing process, which also makes the material itself indeterminate. And because the manufacturing process is relatively simple and the material has plasticity, it has the characteristics of convenient shaping in the subsequent use process. In this regard, in the casting process of the preliminary equipment, this method can be used to internally reform its blast furnace construction, which can not only ensure that the cost and price can be reduced, but also the simple manufacturing process can increase the processing speed. It is worth noting that the production method and service life of this refractory material are similar to that of refractory bricks, and its fire resistance and chemical stability can also reach the level of the same type of refractory bricks. Therefore, it can also be used in the process of prefabricating. The material is directly made into large-scale lumps and then forged at low temperature before use. This ensures that it can be used for a long time in the casting blast furnace to reduce the possibility of its own spalling. It can effectively extend the service life of the inner wall of the blast furnace, and can also reduce the appearance of internal damage caused by temperature changes.
2.Application of Unshaped Refractory Materials in Blast Furnace
(1) When manufacturing the internal structure of the blast furnace, because the fire brick gap is the weak link of the blast furnace brick cutting, this also makes the erosion process mainly destroy from the gap during application. In order to ensure that the overall service life of the blast furnace can be prolonged, and at the same time to reduce the damage and damage caused by the corrosion of the lining, it is necessary to apply refractory mortar to reform the lining when filling the fire brick joints. The degree of sealing can be improved. Since the refractory mud itself is an unshaped refractory material, in the process of blending, in order to ensure the overall adhesion and fire resistance, it is necessary to identify the material of the fireproof brick joints of the industry furnace lining and to Debug the temperature of the application effect, and then match the gap, so as to ensure that after the filling is completed, the blast furnace lining can be completely formed into a smooth whole, thereby ensuring that the overall high temperature resistance due to the erosion of the lining is reduced. .
In the process of lining the blast furnace, it is necessary to ensure that there is a cooling stave between the lining and the furnace shell, and this kind of cooling stave needs to increase the filler to make the insulation between the two linings or sticky The compound can form its own protective film, and can also exert the application effect of the internal substance. When the blast furnace is put into production for a period of time, the waist and lower part of the furnace body will be more severely corroded due to the erosion of thermal energy, which also increases the composite energy when it is working, causing the cooling equipment to be at high temperature and high pressure. If the bottom is damaged, the surface of the furnace shell will be bulged or cracked. In this regard, it is necessary to press the unshaped refractory material into the prolonged furnace body by grouting, so that the service life of the blast furnace can be effectively increased, and a series of safety risks caused by equipment damage can also be reduced.
(4) When the lining of the blast furnace is cracked, the surface can be treated by gunning the lining. Under normal circumstances, it is necessary to spray a layer of unshaped refractory at this time to prevent the occurrence of fission caused by cracks. At the same time, because the iron blast furnace itself is forged with high-quality bauxite and graphite as the main raw refractory materials, adding a certain amount of silicide can ensure that it becomes a hard object after high pressure and high temperature, and it has high temperature resistance, The function of good thermal conductivity, so in application, it can also effectively improve its own service life.
3 Application Methods of Unshaped Refractories in Blast Furnaces
1 New Water Wall Technology
In the process of stacking the blast furnace, it must be ensured that the internal cooling protection wall needs to be formed by injection, and the lining of this refractory material can also play the role of internal and external heat insulation, so that it can effectively reduce Loss of heat energy. Under normal circumstances, after a period of one to two years of use, the blast furnace will cause the internal cooling wall to break, which also makes the surface of the cooling wall exposed, which increases the heat energy consumption and also leads to safety. The occurrence of hidden dangers. Therefore, it can also be said that if there is no refractory material, the slag will directly adhere to the cooling wall after combustion and cooling, and due to the large difference in its own expansion coefficient, it will cause the slag skin to fall off at any time. . In this regard, in order to effectively solve this problem, the cermet lining can be used to transform it, which can not only realize the effective protection of its cooling stave, but the cermet lining can also be realized through its own thermal conductive fiber application. The improvement of fire resistance and ensuring that its own metal properties can be preserved intact, which also makes it itself has the characteristics of better thermal conductivity, and its plastic deformation ability is better, in the application process, even in a high temperature environment, The material does not appear to be brittle.
2 Blast Furnace Lining Injection Technology
Carbon monoxide inside the blast furnace will lead to the deposition of carbon elements in the refractory material, which will lead to the destruction of the overall structure of the material. The main problem displayed on the furnace wall is the occurrence of internal fracture or the reduction of the strength of the refractory material itself, or It is the phenomenon that the material has cracked, causing irregular fractures at both ends of the refractory material. Therefore, if iron is contained inside, it will catalyze the reaction, which will increase its overall collapse efficiency. Because, among all refractory materials, iron trioxide must be applied, but it will react with carbon monoxide and produce iron elements, which happen to act as catalysts reflected by carbon deposition, so in the case of normal use in blast furnaces , This kind of problem is unavoidable, which also makes the blast furnace work will cause its own service life to decrease.
3.Nano-Silica Combined with Pouring Technology
After a few years of application of the blast furnace, the iron mouth of the blast furnace will experience varying degrees of wear, and the work efficiency will be reduced. When it is traditionally repaired, the overall improvement will be achieved by pressing in with mud guns. However, this will not only lead to an increase in the consumption of refractory clay guns, but also unable to achieve a radical cure for this problem. In this regard, it is necessary to apply some new technologies to realize the transformation of its iron gate. At the current stage, nano-silica combined with injection molding is one of the main application methods for iron hole repair, and since silicon carbide is the main raw material, and silica is used as a gelling agent, this is not only It can effectively improve its overall structural strength, and it can also achieve rapid drying without explosions. At the same time, after the repair is completed, it can also achieve an effective increase in its structural strength.
