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The use of sintered tabular corundum in refractories

The properties of tabular corundum have many applications in the field of refractories. Mainly used in the steel industry. Tabular corundum is an ideal material containing 90% alumina for high alumina bricks and amorphous linings. Tabular corundum is suitable for ceramic, chemical and water-bound substrates. Plate corundum can be used alone and in combination, or it can be used with calcined and/or activated alumina.
1. Sliding nozzle
Good thermal shock stability is a requirement for the selection of refractory materials for sliding nozzles. The sintered tabular corundum can just meet its requirements. At present, an appropriate amount of graphite (or carbon black) is added to the sintered plate-shaped corundum as the basic material of aluminum-carbon sliding nozzle, or an appropriate amount of zirconia, graphite (or carbon black) is added to the sintered plate-shaped corundum as the basic material of aluminum- The zirconium-carbon sliding nozzle is still the main body of the sliding nozzle material in China.

2. Ladle castable
With the continuous development of out-of-furnace refining technology, the use environment of refractory materials in ladle is becoming more and more demanding. The molten steel needs to stay longer in the ladle for stirring, heating, and erosion of different steel slags. The single material (such as magnesium or aluminum) of the ladle lining has been replaced by composite materials. The aluminum-spinel system castables with sintered tabular corundum and spinel as the main materials are used for the bottom or wall of the cladding, and the magnesia carbon bricks are used for the slag line. This is the basic mode used for large and medium-sized ladle refractories.
3. Prefabricated parts
Prefabricated parts such as: breathable bricks, seat bricks, spray guns, impact plates, etc., are not only part of the refractory lining of the ladle, but also play a very important role in the steelmaking process itself. The composite use of sintered tabular corundum, spinel and other refractory raw materials can more effectively improve the thermodynamic properties of refractory materials, that is, increase wear resistance and corrosion resistance.

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June 2024
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