The production method of alumina and its application in factory

In what form does alumina exist in nature   

Alumina ( Al 2O 3 ), as an important inorganic compound, occupies an important position in the modern industrial system. Its ionic crystal structure is formed by aluminum and oxygen ions through ionic bonds. In nature, it mainly occurs in bauxite, nepheline and other mineral resources.   

Physical and chemical properties of alumina   

From the perspective of material science, alumina has excellent physical and chemical properties. Its melting point is as high as 2054 °C, and its Mohs hardness is 9. This high melting point and high hardness make it able to withstand extreme temperatures and mechanical stress environments. At the same time, the synergistic optimization of conductivity and insulation performance can be achieved by crystal form regulation.α-Al2O3 has good insulation, while γ-Al2O3 shows unique ion conduction characteristics. These properties provide a material basis for its cross-domain applications.   

Application of alumina in industrial field  

At the industrial application level, aluminium oxid is a key basic material in many fields. In the chemical industry, as an important component of cement, glass and ceramic production, it enhances the cementitious strength and durability by participating in hydration reactions in the cement system. Adjusting the network structure in glass manufacturing to enhance chemical stability and thermal stability ; in the field of advanced ceramic preparation, high-purity alumina powder can be sintered to form high-performance structural ceramics, which are widely used in cutting tools, wear-resistant parts and so on. In the field of building materials, alumina-based refractory materials ensure the safe operation of high-temperature industries such as metallurgy and electric power by using temperatures above 1700 °C. The introduction of activated alumina powder into the concrete system can significantly improve the compressive strength and corrosion resistance of the material. In addition, in the field of chemical catalysis, γ-Al2O3 has become an ideal catalyst support for petroleum refining and chemical synthesis due to its large specific surface area and adjustable pore structure. In the pharmaceutical industry, nano-alumina is used for the development of drug sustained-release carriers and dental restoration materials.   

Alumina industrial production methods   

At present, the industrial production of alumina mainly adopts Bayer method ( chemical extraction of bauxite ), aluminum hydroxide calcination method and aluminosilicate mineral synthesis technology. With the deepening of the concept of green manufacturing, the industry is actively exploring new processes such as low-energy dissolution and carbon emission reduction roasting. By optimizing raw material pretreatment, strengthening process control and other technical means, the synergistic improvement of production efficiency and environmental benefits is realized.   

As a typical inorganic non-metallic material, the application value of alumina in strategic emerging industries such as energy, electronics, aerospace and so on continues to expand. With the innovation and breakthrough of material science and engineering technology, alumina will play a more critical supporting role in the field of high-end manufacturing, and promote industrial technology upgrading and sustainable development.