Calcined -alumina: The Material Darling in the Rise of Emerging Industries

Calcined -alumina is a material of significant importance in the industrial field. It is produced from industrial aluminum hydroxide or industrial alumina through a series of complex and meticulous processing techniques.
In terms of the preparation process, the pre-treatment of raw materials is crucial. The purity and particle size of the raw materials must be strictly controlled. For raw materials with high impurity content, impurity removal and purification operations are necessary, such as using chemical precipitation to remove impurities like iron and silicon. The raw materials also need to be ground and sieved to ensure uniform particle size and meet the requirements of subsequent processing. During the calcination stage, the selection of high-temperature furnaces and temperature control directly affect product quality. Generally, resistance furnaces, gas furnaces, etc. are used, with the temperature controlled at 1200 - 1600 degree . The heating rate and holding time are also important. A too rapid heating rate may lead to crystal structure defects, while insufficient holding time may result in incomplete crystal transformation. For example, the heating rate is controlled at 5 - 10 degree /min, and the holding time is 2 - 4 hours. After calcination, the product needs to be crushed and classified to meet the particle size requirements of different application scenarios. Common methods include mechanical crushing and jet milling, followed by separation of products with different particle sizes using screening and classification equipment.
In terms of performance characteristics, it has high hardness, with a Mohs hardness of up to 9, second only to diamond, making it highly effective in the field of wear-resistant materials for manufacturing grinding media, cutting tools, etc. It also has excellent chemical stability and is not prone to chemical reactions in acids, alkalis, and other chemical substances, making it suitable for use as an inner lining of chemical equipment and a carrier for catalysts. Additionally, it has good electrical insulation properties and can be used as an insulating material for electronic components and a substrate for integrated circuits.
The application fields of calcined -alumina are extremely wide. In the ceramic industry, it is used to produce high-performance structural ceramics, such as engine parts, cutting tools, and bearings, to enhance product strength, hardness, and wear resistance. In the electronics industry, it is an important material for manufacturing electronic ceramics, integrated circuit substrates, capacitors, etc., ensuring the stable performance of electronic products. In the refractory materials field, it is used to produce high-temperature furnace linings and refractory bricks to meet the requirements of high-temperature environments. In the abrasive and grinding tools industry, it is used to make grinding wheels, sandpaper, etc., effectively improving grinding efficiency and quality.
Nowadays, with the development of technology, the demand for high-performance calcined -alumina in emerging industries such as new energy vehicles, 5G communications, and aerospace has increased significantly, driving continuous innovation in preparation technology towards refinement, high performance, and low cost.

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