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2020
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Factors Affecting the Performance of Argon Bottom-Blown Bricks in Steel Ladles
Source： Ke Chuang Xin Cai
Release time：2020-01-15 09:23
The quality of bottom-blown argon permeable bricks in steel ladles is crucial for steelmakers. During use, adverse factors should be avoided or addressed. Factors affecting the effectiveness of bottom-blown argon permeable bricks include steel penetration of the permeable brick working surface, blockage of permeable bricks (slit type) by slag, changes in material properties, fluctuations in gas source pressure, and prolonged ladle downtime.
Bottom-blown argon permeable brick for ladle The quality of the bottom-blown argon permeable bricks is crucial for steelmakers. During use, adverse factors should be avoided or addressed. Factors affecting the effectiveness of bottom-blown argon permeable bricks include steel penetration on the working surface of the permeable brick, blockage of the permeable brick (slit type) by slag, material changes, fluctuations in gas source pressure, and long ladle downtime.
The working conditions of permeable bricks are extremely harsh. In large ladles, the hydrostatic pressure of the molten steel is high, and the required stirring intensity is also high. Therefore, the key to ensuring gas permeability is that the permeable brick must have strong anti-steel penetration capability. In the production practice of steel plants, the working surface of permeable bricks often becomes coated with steel, so it is necessary to use an oxygen lance to clean the working surface. Slit-type permeable brick If not cleaned thoroughly, the permeable brick will easily become impermeable.
(Figure) Slit-type permeable brick
After the ladle completes continuous casting, permeable brick The working surface of the permeable brick is in full contact with the slag, and the slag will continuously infiltrate into the permeable brick. As the ladle temperature decreases, the slag viscosity increases, and the slit channels of the permeable brick may become blocked, resulting in low or no gas permeability in the subsequent ladle bottom blowing.
Permeable bricks are multi-component, multi-phase composite materials with structural characteristics such as particles, matrix, interface, and pores. The main chemical component of permeable bricks is alumina, followed by a certain amount of magnesia. Due to the different chemical compositions, the density, compressive strength, and flexural strength of permeable bricks will vary.
(Figure) Anti-penetration permeable brick
In actual use, the argon gas supply pressure may fluctuate due to various reasons. When the argon gas pressure is too low, it cannot stir the molten steel, leading to bottom blowing failure; when the argon gas pressure is too high, it is easy to cause severe splashing of the molten steel, and contact with air can lead to secondary oxidation of the molten steel.
If the ladle downtime is too long, the baking time is insufficient or no baking is performed, the temperature of the ladle lining is not enough. After receiving the steel, the temperature of the molten steel at the bottom of the ladle is low, and cold steel solidifies at the bottom of the ladle, hindering the bottom-blown permeable brick from blowing gas, leading to blowing failure.
Kechuang New Materials has leading domestic production equipment and first-class production technology, and is the largest manufacturer of argon permeable bricks in China with a production capacity of 120,000 sets. Currently, our company has developed various types of bottom-blown argon permeable bricks for ladles, whose performance has reached or exceeded that of similar imported products, and has achieved good results in use, receiving high praise from users!
Source: Luoyang Kechuang New Materials Co., Ltd.: https://www.kcnh.com/ 。
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