Non-metallurgical  alumina and aluminum hydroxide as fine alumina also known as a variety of alumina and chemical alumina, it is the different alumina and aluminum hydroxide products or their extension.According to its chemical composition, crystal structure, particle size, purity'the crystal shape, the specific surface area, and so on, It can be divided into many different kinds.Different varieties of alumina and alumina hydroxide products are widely used in aerospace, electronics, chemical and chemical industry, medicine, catalyst and its   carrier, rubber, pigment, paper making, refractory materials, insulating materials, filler, semiconductor processing, ceramics, machinery, metallurgy and other fields.

The preparation method of alumina powder can be divided into two categories, one is the mechanical crushing method preparation, generally using ball mill, mixing mill, airflow pulverizer, etc., the preparation process is just a physical change, according to the characteristics of each grinding equipment, it can produce different particle size of micron powder, the disadvantage of this method is its large energy consumption;The second is to prepare by chemical method. This kind of method can meet the requirements of purity, particle size and morphology, but also it has the disadvantages of complex operation process and high preparation cost.With the promoted application of powder technology, the sander stands out in the preparation of submicron and nano a-alumina powder.Vertical mill and ring roller mill show outstanding performance in the production of aluminum hydroxide.In addition, the coating of alumina and alumina hydroxide powder has become one of the important means for enterprises to enhance the added value of products.

Alumina powder and its products have many application according to different physical and chemical properties, aluminum hydroxide is widely used in flame retardant fillers, artificial marble, paper whitening agent, synthetic molecular sieve, toothpaste fillers, anti-gastric acid, glass raw materials, etc.Other alumina applications are more extensive, 1. α-type alumina for fine ceramics, electrical insulation , grinding and polishing, etc.  2, high purity alumina used in sapphire, lithium electric ceramic diaphragm, LED packaging, as a functional ceramic production of various sensors, etc.3. γ-type activated alumina for adsorbent, dehydrating agent, automobile exhaust purifier, etc.;4, alumina fiber for high temperature thermal insulation materials and reinforced composite woven non-woven fabric and rope, high temperature furnace and other thermal equipment lining insulation;5, the alumina membrane is used for the purification and separation of gas, water filtration, the separation and purification of drugs, the removal of bacteria, viruses and other ultrafiltration process.5. Boehmite applied to lithium electric diaphragm.

At present, under the background of serious excess production capacity of domestic industrial alumina, fine alumina products have high technical content and high added value, and its development prospect is more worth looking forward to.For example, the application demand of spherical alumina in thermal conductivity filler is increasing rapidly;With the arrival of 5G era, the amount of aluminum oxide added to cover glass is increasing due to the requirement of improving the strength.Under  the promotion of environmental protection policy,Alumina ceramic membrane has been used more wider in the sewage and dust treatment areas of the market.