Origin and production process of brown corundum
As one of the important raw materials for the production of brown alumina, bauxite has been labeled as a non-renewable resource, and its price is destined to only increase. In addition, the frequent launch of domestic alumina projects severely cut off the source of raw materials for brown corundum production. The battle for bauxite mining rights thus started is about to break out, making brown corundum producers worried. In addition, there is also the steel industry in the narrow competition for raw materials. Because iron filings are essential to the brown corundum production industry, corundum production enterprises have broken their teeth and swallowed them.
Second: Since the reform and opening up, China's brown fused alumina production has grown by leaps and bounds due to the country's resource advantages such as bauxite, electricity, and human resources, and strong market demand. In just 20 years, the annual production capacity has soared from less than 100,000 tons to more than 2 million tons now, and China has become a major producer of brown corundum globally.
The crystal form of brown corundum is a reflection of the crystal structure. It has a glass luster, has the opposite elements of L33L23PC, and has a specific gravity of 3.98. It has a barrel shape, a hexagonal columnar shape, and a hexagonal double cone. Color rings (color bands) parallel to the cylindrical surface and the cone surface often appear. ). It is produced in igneous and metamorphic rocks that are relatively depleted in silicon and is common in alluvial sand deposits. North Carolina and Georgia in the United States, the Ural Mountains in Russia, and Transvaal in South Africa are the main producing areas.
It is off-white or light yellow, with high hardness and toughness. Produced by a special process, each particle size product is produced by natural crystallization, not the result of mechanical crushing. It is a heat-resistant high-grade abrasive material with very good toughness. It is used to make advanced cutting and grinding tools. It is suitable for high-vanadium high-speed steel and Austen Grinding of high-hardness, high-toughness materials such as stainless steel and titanium alloy, especially for dry grinding and grinding of workpieces that are easily deformed and burnt.