What corundum and corundum big difference

First, brown fused alumina and white fused alumina abrasives are used can be done. Corundum variety of colors, because it contains ions of different colors show different colors according to the color into brown fused alumina, white fused alumina, black corundum and so on.
Corundum are colorless, white, yellow (pigment ion Ni, Cr), yellow (pigment ion Ni), red (pigment ion Cr), and blue (pigment ion Ti, Fe), green (pigment ion Co, Ni, V), purple (Ti, Fe, Cr), brown, black (pigment ion Fe, Fe), incandescent violet, purple under fluorescent effect (pigment ion V).
In addition to color and itself contains pigment ion differences, corundum and corundum physicochemical characteristics and intended use also differ greatly.White fused alumina is high-quality aluminum oxide powder as raw material, corundum crystals formed by fused refined, high purity, good self-sharpening, acid corrosion, high temperature, thermal properties and stability. Slightly higher than corundum corundum hardness, toughness slightly lower, high purity, good self-sharpening, grinding ability, heat a small, high efficiency, acid and alkali resistance, high temperature resistance and good thermal stability. Made with corundum abrasive grain of sand, suitable for grinding high carbon steel, high speed steel and stainless steel fine-grained abrasive corundum can also be used for precision casting and high-grade refractory.
Corundum of sand :0-1mm 1-3mm 3-5mm 5-8mm white corundum Physical indicators: Al2O3 ≥ 99% Na2O ≤ 0.5% CaO ≤ 0.4% ≤ 0.003% magnetic material
Corundum is bauxite, anthracite, iron as the main raw material in electric arc furnace at high temperature smelting, brown color, good toughness, hardness 1800-2200Kg/mm2, bulk density ≥ 3.85g/cm3, resistance high temperature, high refractoriness 1850 ℃, do refractories, also used as an abrasive.