It is made of white fused alumina grit sand. It is suitable for grinding fine grained abrasives such as high carbon steel, high speed steel and stainless steel. White corundum can also be used for precision forging and high grade refractory materials. White corundum sand: 0-1mm 1-3mm 3-5mm 5-8mm of Al2O3 more than 99% goals: Na2O = 0.5%, CaO = 0.4% magnetic material is less than or equal to 0.003%. 

Brown fused alumina is mainly made of bauxite, anthracite and iron filings. It is formed by high temperature exercise in electric arc furnace. It is brown, with good patience and micro hardness 1800-2200Kg/mm2, the volume density is larger than 3.85g/cm3, high temperature resistance, high refractoriness of up to 1850 DEG C, as refractory, can also be used as abrasives.White corundum is made from aluminum oxide powder and white fused alumina. It is characterized by high purity, good self sharpening, acid and alkali corrosion resistance, high temperature resistance and stable thermal function. The hardness of white corundum is slightly higher than that of brown corundum, it has low tolerance, high purity, good self sharpening, good grinding ability, little heat, high efficiency, acid and alkali corrosion resistance, high temperature resistance and good stability.

Specific physical and chemical indexes:

Item Al2O3%SiO2%Fe2O3%Na2O%CaO% true density 

Index 98.5-99.5≤0.01≤0.04≤0.45 0.03 3.95g/cm3

It is fused with bauxite, anthracite, iron as the main raw materials, high temperature in the electric arc furnace smelting and become, brown, good toughness, hardness of 1800-2200Kg/mm2, the bulk density is larger than 3.85g/cm3, high temperature resistance, high refractoriness can reach 1850 DEG C, refractory material, also can be used as abrasives.

Brown corundum with excellent raw materials for bauxite, anthracite, iron lantern, in the arc made by melting temperature above 2000 degrees, the self mill damage, magnetic separation, sieve into a variety of sizes, its dense texture, high hardness, the formation of spherical particles, suitable for making ceramic and resin high consolidation abrasive and grinding, polishing fine, sandblasting, forging, also can be used for the production of high-grade refractory materials.

Usefulness: brown corundum has the characteristics of high purity, good crystallization, strong fluidity, low coefficient of linear expansion and corrosion resistance. After dozens of refractory production company practice certification, the product in the process of non detonation, no powder, no cracking characteristics. Especially it is much higher than the traditional brown corundum price, make it become the best corundum refractory aggregate and filler.

Specific physical and chemical indexes:Grain size chemical composition (by weight) 

Al2O3TiO2SiO2Fe2O3CaO

 8-5、5-3、3-1≥94.5 1.5-3.8≤1.5≤0.5≤0.3 

1-0mm≥94.0 1.5-3.8≤1.5≤0.5≤0.3 200-0目≥93.0 1.5-3.8≤1.5≤0.5≤0.3 325-0目≥92.0 1.5-3.8≤1.5≤0.5≤0.3

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