Corundum is divided into natural corundum and artificial corundum. Natural corundum is a pure alumina (Al2O3). The main mineral component of artificial corundum is physical corundum. Artificial corundum is divided into brown corundum (A), white corundum (WA), chrome corundum (PA), zirconium corundum (ZA), black corundum (BA), single crystal corundum (SA), microcrystalline corundum (MA) and the like. The brown corundum is mainly made by using aluminum bauxite, iron filings and anthracite in the electric arc furnace by melting and reducing impurities; white corundum is obtained by melt crystallization of aluminum oxide powder in an electric arc furnace; other corundum is different in alumina content. A certain amount of other oxide-derived substances having different properties are added during the melting process. A large number of corundum applications are brown corundum and white corundum.
Industry analysts pointed out that: Abrasives are known as "industrial teeth", not only related to equipment manufacturing, aerospace, shipbuilding, new energy, automobiles, home appliances, electronic information and other industries, but also have penetrated into people's lives. aspect. As a kind of abrasive, artificial corundum, China, India, Russia have become the market with the largest sales growth of artificial corundum products. China will surpass the United States as the world's largest producer of artificial corundum.
At present, China has become a major consumer of artificial corundum, but it is not a strong country. The international artificial corundum products are mainly concentrated in the low-end market, and the product technology content is low. Compared with the international advanced level, there is still a big gap. The international high-end technology products are lacking, and the second is relying on exports. The high-end product function has a large gap with foreign products, and can only meet 30% of the demand of several pillar industries of automobiles, aerospace, machine tools, bearings, rolling stock and ships; most of the products are maintained in the traditional mid-to-high grade.
Corundum has considerable hardness and certain toughness, can be granulated into different size ranges and the shape of the particles is uniform and uniform, with high temperature stability and chemical stability. The Mohs hardness of brown corundum is 9, the microhardness is 1800-2200kg/mm2; the Mohs hardness of white corundum is 9, and the microhardness is 2200-2400kg/mm2, which is second only to diamond. Brown corundum and white corundum are the main materials for the manufacture of bonded abrasives and advanced refractory materials and products. They can also be used for anti-skid, grinding, investment casting, and advanced ceramics.
According to the published “In-depth Research and Prospect Forecast Report of China's Artificial Corundum Industry in 2014-2018”, in 2013, the sales revenue of China's artificial corundum industry reached 18.38 billion yuan, an increase of 8.9%. In 2012, China's artificial corundum industry sales revenue reached 16.882 billion yuan, an increase of 40.4%.
China's artificial corundum industry is dominated by small and medium-sized enterprises, especially small enterprises. There are many small-scale artificial corundum enterprises in China, but the sales revenue is small, the number of medium-sized enterprises is small, but the sales revenue is large. Compared with medium-sized enterprises, small enterprises have weak strength, weak technological innovation capability, backward production equipment, poor product quality, and are in competition. Disadvantageous position.
From a regional point of view, China's man-made corundum production enterprises are mainly concentrated in East China and South China, especially in East China, and from the specific provinces, Guizhou, Henan and Shandong provinces are densely packed with artificial corundum. Most artificial corundum production companies.