Except for metallurgical grade aluminum oxide, various types of aluminum oxide, aluminum hydroxide, and aluminum containing compounds are referred to as chemical aluminum oxide, which is collectively referred to as non metallurgical grade aluminum oxide internationally. Among them, those that undergo special processing and have certain differences in performance compared to metallurgical grade aluminum oxide are referred to as special aluminum oxide.
Classification of Special Alumina
According to the different crystal forms, it is mainly divided into calcination α－ Alumina, fused alumina and Activated alumina.
calcination α－ Aluminum oxide: small specific surface area, high hardness, high temperature resistance, strong acid and alkali resistance, wear resistance, good thermal conductivity and resistance to rapid cooling and heating, high resistance, and low water absorption rate

calcination α－ Alumina micropowder

It can be used in the refractory material industry, abrasive tool industry, glass ceramic industry, etc.
Developed countries such as Europe, America, and Japan have done a lot of work in the research and production of special alumina, and have formed large-scale mass production. The demand and production volume of special alumina have also shown an increasing trend. At present, the international market share of special alumina is mostly occupied by foreign established enterprises.
However, with the construction of new infrastructure in China and the continuous efforts of "Made in China 2025", China's special aluminum oxide will gradually involve the high-end market. Domestic enterprises should increase development efforts and vigorously develop new varieties, such as high-purity ultra fine aluminum oxide required by the ceramic industry and electronic industry. Take a new path in the market dispute with established companies.