Tabular alumina

1. Introduction to plate corundum

Plate corundum is a kind of pure sintered corundum without any additives such as MgO, B2O3 and so on. It has a crystal structure of α - Al2O3 with coarse crystal size and good development. The content of Al2O3 is more than 99%. The plate crystal structure has small pores and many closed pores. The porosity is about the same as that of electric fused corundum. It has high purity, good volume stability and very small reburning shrinkage The refractory or castable has good thermal shock stability and bending strength after high temperature treatment.

Characteristics of tabular corundum

A:High fire resistance;

B:High corrosion resistance;

C:High scour resistance;

D:High thermal shock stability;

E:High strength and toughness;

F:Stable chemical properties.

2.Physical and chemical indexes of plate corundum

Common grain size of plate corundum

Can be produced according to customer requirements

Main uses of tabular corundum

 plate corundum can be used as the main component in alumina carbon, alumina magnesia carbon, magnesia alumina carbon, magnesia spinel and alumina chrome refractory bricks, and can also be introduced into high alumina amorphous refractories as enriched alumina component, which can be widely used in steel, casting, ceramics and other industries, among which the application in steel industry almost covers the whole process of iron and steel making.

Application of plate corundum in iron and steel industry

sliding nozzle

At present, adding appropriate amount of graphite (or carbon black) and antioxidant as the basic material of aluminum carbon sliding nozzle in sintered plate corundum, or adding appropriate amount of zirconia, graphite (or carbon black) and antioxidant as the basic material of aluminum zirconia carbon sliding nozzle in sintered plate corundum is still the main material of domestic sliding nozzle.

ladle castable

With the continuous development of refining technology outside the furnace, the application environment of refractories in ladle is more and more severe. The molten steel needs to stay in the ladle for a longer time for stirring, heating and different slag erosion. The single material of ladle lining (such as magnesium or aluminum) has been replaced by composite material. At present, the basic mode of using large and medium-sized ladle refractories is to use Al Mg spinel system castables with sintered plate corundum and spinel as main materials for ladle bottom or wall, and MgO-C brick for slag line.

prefabricated parts

Prefabricated parts, such as air permeable brick, seat brick, spray gun, impact plate, etc., are not only a part of the ladle refractory lining, but also play a very important role in the steel-making process itself. The composite use of sintered plate corundum, spinel and other refractory materials can effectively improve the thermodynamic properties of refractories, i.e. improve the wear resistance and erosion resistance.