Views: 0 Author: Site Editor Publish Time: 2022-08-24 Origin: Site
Monolithic refractories are currently in a prosperous state in the domestic market. At the same time, the production technology of monolithic refractories has also progressed and developed. The company firmly believes that with the assistance of technology, the development scope of monolithic refractories will be broader. The following is a detailed description of the development of monolithic refractories.
The following is a list of contents:
·Monolithic refractories to be used in ironmaking systems
·Monolithic refractories to be used in steelmaking systems
·Monolithic refractories to be used in rolling systems
The ironmaking system includes sintering, coking, and blast furnaces and their ancillary equipment. In the process of iron ore powder sintering, sintering machine holding furnaces are often lined with two materials, namely, refractory fiber felt or lightweight thermal insulation monolithic refractories. The iron-making blast furnace is continuous production equipment. In the past, high-alumina cement and high-alumina phosphate monolithic refractories were used to build small blast furnaces. Now they are all built with resin-bonded aluminum-carbon fire-resistant bricks. It is a future development trend to choose monolithic refractories as the refractory material for the furnace wall of large blast furnaces. A hot blast furnace is an important supporting equipment for an iron-making blast furnace, and it is the equipment that supplies hot air for the iron-making blast furnace. It is mainly divided into three types: internal combustion type, external combustion type, and top combustion type. The lining of the hot blast furnace of medium and small blast furnaces is generally built with refractory castable prefabricated blocks. In the process of building a hot blast stove, the construction of the dome is the most critical and the most difficult. It is difficult to achieve satisfactory healing if only domed bricks are used. If monolithic refractories are used instead of bricks, the joint problem can be solved in situ. A large number of practices have proved that mixing a small amount of bauxite into phosphate concrete and using it as a coagulant on a hot blast stove has good performance. Another layer of acid-resistant paint is sprayed on the dome of the hot blast stove to form an integral lining, which can effectively resist the penetration and erosion of the furnace shell by sulfur-containing flue gas.
Steelmaking systems include open hearths, converters, electric furnaces, out-of-furnace refining furnaces, ladles and tundishes, and other equipment. In the past, clay bricks, high-alumina bricks, and semi-silica bricks were generally used to build ladles, so the ladle built in this way has a service life of 10 to 70 times. In recent years, water glass aluminum-magnesium carbon non-burning bricks have been widely used to build ladle, which has a service life of 35 to 80 times, and the ladle age is significantly improved. At present, Al2O3-spinel castable has become the protagonist of monolithic refractories for a ladle. As we all know, it has good corrosion resistance and relatively long service life, which improves the quality of steel to a certain extent. Advanced and diversified is the development direction of monolithic refractory materials for continuous casting, and the development of continuous casting steel promotes the formation of this development direction. As far as the world is concerned, the continuous casting ratio is increasing, from 10% of the world's continuous casting ratio in 1970 to 52% in 1986, and Denmark is the highest, reaching 100%. In the early 1990s, the continuous casting ratios in Japan, the United States, and Western Europe reached 94%, 65%, and 87%, respectively, and my country was relatively low at 22%. In the whole continuous casting system, almost 90% of the refractory materials are consumed by the tundish, so the type and performance of the monolithic refractories used in the continuous casting have a significant impact on the quality and cost of the continuous casting.
There are many types and quantities of industrial furnaces used in the steel rolling system, and the operating temperature is generally lower than 1500 ℃, all of which are flame furnaces. Using high-alumina refractory plastics or monolithic refractories combined with monolithic refractories as the overall lining of the first rolling soaking furnace wall has a service life of 3 to 6 years, which is 1 to 4 times higher than that of high-alumina bricks. The service life of the furnace cover is very long. For example, the service life of the large-scale walking beam heating furnace of WISCO in my country has reached as much as 15 years, while the service life of the general furnace cover is only 4 to 8 years; The furnace temperature fluctuates greatly and is accompanied by vibration, etc. If the brick lining is used, the service life is only 2 to 5 months; while the heating furnace lined with clay combined with monolithic refractories has a service life of more than 2 years.
The company will promote the healthy and sustainable development of the monolithic refractories industry and reduce energy consumption to the requirements of the Scientific Outlook on Development. After reading the above content, if you are interested in monolithic refractories, you can check our company's website https://www.yufengrefractory.com/, we look forward to your arrival.
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