Which of the four commonly used steel ladle permeable bricks is the most suitable?

Source: | Author:Changxing | Published time: 1744 days ago | 843 Views | Share:

Permeable bricks are mainly composed of sintered magnesia, magnesia, high alumina and corundum.

1. Sintered magnesia permeable brick
Sintered magnesia material refers to refractory material with MgO content above 80%. It belongs to alkaline refractory material. It has high refractoriness, strong resistance to alkali slag erosion, no corrosion of Ca and CaO, and no pollution to molten steel. However, its large expansion coefficient and poor thermal shock resistance make the material peel off, which greatly reduces the service life of the magnesium refractory.

2. Magnesia chrome permeable brick
Magnesia-chromium material is a refractory material containing MgO and Cr2O3 as main components, and periclase and spinel are the main mineral components. The chrome ore is not inert to steel making slag and has compatibility with other refractory materials. The appearance of magnesia-chromium materials has greatly improved the thermal shock resistance of magnesium materials.

3. High aluminum permeable brick
High-aluminum material refers to refractory material with Al2O3 content greater than 48%. It has the characteristics of high thermal strength, good wear resistance, thermal shock resistance, anti-flaking and good volume stability at high temperature. However, its slag resistance and penetration performance are not good enough to resist the infiltration and penetration of slag into the brick during the entire service.

4. Corundum permeable brick
Corundum material refers to refractory material with Al2O3 content greater than 90%. Corundum is made by sintering or electrofusion of industrial alumina or bauxite. When industrial alumina is used for electrofusion, white corundum is obtained. The content of Al2O3 is more than 98.5%; when using bauxite as refractory raw material, ordinary corundum is obtained; when adding iron filings, brown corundum is formed; when adding bismuth or cerium oxide, corundum is obtained, and when adding Cr2O3, zirconium is obtained. Corundum, fused plate-shaped corundum is a plate-shaped corundum formed by semi-molten state in an electric arc furnace at 1900-2000 ° C directly using industrial alumina as the main raw material, due to the ultra-high temperature in the region where the electro-melting plate-like corundum is formed. It is beneficial to the volatilization of volatile impurities such as Na2O, and is therefore a process of purifying and purifying itself. The platy alumina material is characterized by high thermal conductivity, good thermal stability, high temperature strength, strong corrosion resistance, but high production cost.

Prev： 4 main rea......

Next： CX REFRACT......