Four kinds of common materials of ladle purging plug

 

Sintered magnesia purging plug: the sintered magnesia material refers to the refractory material with more than 80% MgO content, which belongs to alkaline refractory material. It has the advantages of high refractoriness, strong resistance to alkaline slag erosion, free from Ca and Cao erosion, and no pollution of molten steel.

Magnesia chrome purging plug: magnesia chrome material is a refractory material with MgO and Cr2O3 as the main components and periclase and spinel as the main mineral components. Chrome ore is not inert to steelmaking slag and has compatibility with other refractories, so the appearance of magnesia chrome material can improve the thermal shock resistance of magnesia material.

High alumina purging plug: high alumina material refers to the refractory material with more than 48% alumina content, which has the characteristics of high cold and hot strength, good wear resistance, heat shock resistance, spalling resistance and good volume stability at high temperature.

Corundum ladle purging plug: corundum material refers to the refractory material with more than 90% alumina content. Corundum is made of industrial alumina or bauxite after sintering or electric melting. When industrial alumina is used for electric melting, white corundum with more than 98.5% alumina content is obtained.?When bauxite is used as the raw material, ordinary corundum is obtained; when iron filings are added, brown corundum is produced; when germanium or germanium oxide is added, germanium corundum is obtained;?

When Cr2O3 is added, chromium corundum is obtained, which is fused plate shape Corundum is a plate-shaped corundum formed directly using industrial alumina as the main raw material in a semi-molten state in an electric arc furnace at 1900-2000℃. Due to the ultra-high temperature in the area where the fused plate-shaped corundum is formed, it is beneficial to volatile impurities such as Na2O. Therefore, it is also a process of self-purification and purification. The characteristics of the plate-shaped alumina material are high thermal conductivity, good thermal stability, high temperature strength, strong corrosion resistance, and high production cost.

Under high temperature and vacuum, the order of the wetting angle of molten steel to the oxides of several refractory materials is as follows: Cr2O3>Al2O3>MgO, and the order of the stability of the oxides is as follows: Al2O3>CaO>MgO>Cr2O3, considering the above two points, It is a better choice to use corundum as the main crystal phase of the breathable brick. At the same time, the melting point of Cr2O3 is 2275°C, which is higher than the melting point of Al2O3 (2050°C). Alumina and chromium oxide can form a continuous solid solution. The solid solution formed by AI2O3-Cr2O3 has significant resistance to corrosion by iron oxide or slag. Enhanced. Adding a small amount of Cr2O3 can inhibit the excessive growth of alumina crystals, thereby reducing the internal stress of the crystals and improving the physical properties of the material. However, if Cr2O3 is added too much, the growth rate of corundum grains will be seriously affected, thereby reducing the physical properties of the material. Therefore, the introduction of Cr2O3 in an appropriate amount can improve the thermal shock stability, erosion resistance and corrosion resistance of the material. However, from the perspective of environmental protection, the introduction of Cr2O3 will cause environmental pollution, so the introduction of Cr2O3 should be carefully considered.

Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc.

More Refractory Products:https://www.wanhaorefractory.com/en/product.html

Website:https://www.wanhaorefractory.com/

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