Sintered corundum refers to corundum produced by sintering method, including tabular corundum. Fused corundum is produced by melting bauxite or industrial alumina in an electric arc furnace at 2000-2400 °C. The main types of fused corundum used in the kiln refractory industry are white corundum, dense corundum, sub-white corundum and brown corundum.
Sintered corundum refers to the corundum material with granular crystal shape produced by different sintering processes, also known as sintered alumina. It has the advantages of high purity (Al2O3 greater than 99%), compactness, high thermal conductivity, good thermal shock resistance and corrosion resistance, and high single particle strength. In recent years, its application in the domestic refractory industry has gradually expanded.
According to different raw materials applied, sintered corundum can be divided into bauxite sintered corundum and alumina sintered corundum. The main raw material of bauxite sintered corundum is high alumina bauxite. It is generally made of bauxite through calcination, crushing, wet ball milling, molding and high-temperature calcination. It is mainly used in the abrasive industry and is rarely used in refractory materials.
The sintered corundum used in refractory materials mostly refers to alumina sintered corundum sintered at high temperature with high-quality alumina as raw material. Kilns generally believe that sintered alumina with an Al2O3 content of 99.3% to 99.7%, a true density greater than 3.9g/cm3, a bulk density greater than 3.4g/cm3, and a porosity of less than 2% is the sintered corundum used in refractory materials.
Properties of tabular alumina:
High refractoriness; high corrosion resistance; high erosion resistance; high thermal shock resistance; high strength and good toughness; stable chemical properties
Tabular alumina can be used as the main component in aluminum-carbon, aluminum-magnesium-carbon, magnesium-aluminum-carbon, magnesia-spinel, and aluminum-chrome refractory bricks, and can also be introduced into high-alumina refractory bricks as an enriched alumina component. Among the shaped refractory materials, they can be widely used in iron and steel, casting, ceramics and other industries, and the application in the iron and steel industry almost covers the whole process of iron and steel making.
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