Refractory materials for iron and steel smelting

Refractory materials

Blast furnace refractories:
The development of blast furnace ceramic cups is becoming more and more common, but the need for high corrosion resistance refractory applications to ensure the extension of its service life. In addition to changes in design, refractory material also has a great change, such as micro-porous carbon refractory brick instead of the past, ordinary carbon block to reduce the penetration of molten iron. Used clay refractory bricks as raw materials can better meet the requirements of the use of iron mouth guns. The use of grouting method to repair the blast furnace backing can effectively prevent the erosion of the hot air flow, thereby extending the life of blast furnace lining.
Refractory for converter:
In the aspect of converter steelmaking, a water cooling technology and suspension system are respectively applied in the upper cone and lower barrel parts of the converter shell, thereby reducing the deformation of the converter furnace, prolonging the life of the converter lining and improving the converter productivity. The application of these new technologies has had a certain impact on the use of refractories. So that the converter furnace age increased to an average of 4000 furnace or more, combined with the spray, high lime and dolomite applications and slag splashing furnace technology applications, furnace age more than 10,000 times is not a problem. It is worth the attention of refractory producers to the direction of development.
Continuous submerged nozzle:
Due to the development of the continuous casting system, the tundish has changed from the past transit station to the present metallurgical container which affects the quality of cast steel and improves the productivity of cast steel. Therefore, many functional materials are gradually used in tundish, such as slag weir, impact plate, filter, blowing argon breathable plug and so on.
Immersion nozzle as an important function of continuous casting refractory material, the research carried out mainly in two aspects, one is to improve the slag line parts of the anti-erosion, the second is to reduce the wall of Al2O3 adhesion. The measures to increase the ZrO2 content to 88% and to optimize the particle size distribution can reduce the thermal expansion and porosity of the product and improve the density to improve the slag resistance.
In addition, we should pay close attention to the technological progress of the user industry, such as the recent years of the emergence of direct reduction of iron, and DC arc furnace steel and other new technology on the new requirements of refractories.

More refractories:
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