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New material of ladle bricks and measures to improve service performance

Ladle bricks With the development of refining technology outside the steelmaking furnace, the use conditions of ladle brickslarge ladles are becoming more and more severe, such as: molten steel stays in the ladle bricks for a long time; ladle insulation; working layer temperature increases; refining strength and ratio continue to increase; molten steel requirements Good purity; Ladle life and stability requirements continue to increase. These put forward higher requirements for the refractory material of the ladle working layer. The use of machine pressing technology to manufacture unburned compact bricks has the characteristics of high production efficiency, good compactness, stable product quality and high service life. application effect. Both the production and the application process are in line with the steel mill's concept of energy conservation and emission reduction, green environmental protection, and efficient production, which is one of the development trends of carbon-free steel ladle refractories. In recent years, with the rapid development of the country, ladle bricks have also guided the development of metallurgical technology. With the development of metallurgical technology, the requirements for refractory materials of ladle bricks are getting higher and higher. Aluminum bricks are developing in the direction of magnesia carbon bricks, magnesia-alumina bricks, aluminum-magnesium-carbon bricks and unshaped refractories. In order to improve the slag permeability and thermal shock stability of ladle bricks, domestic refractory manufacturers have developed aluminum spinel unburned bricks and high alumina bauxite-spinel castables.

Measures to improve the use performance of ladle bricks
1. Add zirconium-based material, which can modify the aluminum-chromium ladle brick.
2. Reduce the impurity content to improve the corrosion resistance of the breathable brick, because the more impurities in the refractory material, the more serious the ablation and oxygen corrosion loss.
3. Ultrafine powder is preferred to improve the strength of the ladle brick. When the micropowder is used as a binder, the amount of water added during molding is small, and the high temperature and the strength after burning are high.
4. Reasonable selection of slit width.
5. The uniform distribution improves the volume stability of the air-permeable bricks. During the molding process of the ladle bricks, the distribution of the castable directly affects the volume stability of the ladle bricks.

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