There are many colors of corundum, because it contains different pigment ions and presents different colors. Corundum can be divided into brown corundum, white corundum and black corundum by color. Corundum is colorless, white, gold (pigment ions Ni, Cr), yellow (pigment ions Ni), red (pigment ions Cr), blue (pigment ions Ti, Fe), green (pigment ions Co, Ni, V), purple (Ti, Fe, Cr), brown, black (pigment ions Fe, Fe), and under incandescent lamp. High purity, good self-sharpening, acid and alkali corrosion resistance, high temperature resistance and stable thermal performance. White corundum has slightly higher hardness than brown corundum, slightly lower toughness, high purity, good self-sharpening, strong grinding ability, low calorific value, high efficiency, acid and alkali corrosion resistance and good high-temperature thermal stability. Abrasive tools made of white corundum granular sand are 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 casting and advanced refractories. Brown corundum is made from bauxite, anthracite and iron filings by high temperature smelting in electric arc furnace. Brown color, good toughness, microhardness 1800-2200kg/mm2, bulk density ≥3.85g/cm3, high temperature and fire resistance up to 1850℃. It can be used as refractory or abrasive. It has the advantages of acid and alkali corrosion resistance, high temperature resistance and stable thermal performance, and plays a unique role in the fields of precision casting and advanced refractories. Here, the basic characteristics and application scope of white corundum are summarized and explained in detail: the granularity of fused white corundum is produced according to international standards and national standards, and can be processed according to the granularity required by users.

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