α- Aluminum oxide, also known as calcined aluminum oxide, has the characteristics of high melting point, high hardness, strong insulation performance, good wear resistance, and stable chemical properties. It is widely used in many fields such as refractory materials, insulation equipment, integrated circuit substrates, abrasive tools, ceramic materials, and so on. In order to adapt to different industries α- Due to the special needs of alumina, people form a variety of high value-added products by controlling its primary crystal shape, particle size distribution and impurity content.
Roasted α- Alumina raw powder (secondary particles) is a polymer of many primary crystals (primary particles) α- Alumina primary crystal belongs to trigonal crystal system, with large lattice energy, strong bonding force between positive and negative ions, melting point up to 2053 ℃, Mohs hardness of 9, and mechanical crushing method, whether vibration mill, ball mill or airflow mill α- Aluminum oxide micropowder can only disperse these polymers and is difficult to destroy their original crystal structure, so the size of the original crystal restricts α- The fineness of alumina powder processing requires the production of high added value with strict particle size requirements α- Controlling the original crystal size during the roasting process of alumina is a key process.
At this point, mineralizers are a very necessary presence. Because mineralizers not only have the ability to remove sodium and reduce α- The transformation temperature of alumina has a dual effect and also has a good promoting effect on changing the original crystal shape.

calcination α- The mineralizers of Al2O3 mainly include boron series, chlorine series, fluorine series and other mineralizers. Mineralizer is being calcined α- The role of Al2O3 in the process is mainly manifested in reducing the calcination temperature and promoting α- Transformation and Reduction of Al2O3 Crystal Form α- Sodium oxide content in Al2O3. But specifically, different mineralizers have different effects on the grain size of the original crystal. Some significantly promote the growth of the original crystal size, while others have a good inhibitory effect on grain growth. Moreover, mineralizers have a significant impact on α- The morphology of Al2O3 grains has a certain impact.