Aluminum oxide has the molecular formula Al2O3, with a melting point of 2054 and a boiling point of 2980. It is insoluble in water but soluble in cryolite. Aluminum oxide is a amphoteric oxide that forms aluminum salts when it reacts with alkali and aluminum salts of the acid when it reacts with acid.

Activated alumina manufacturers believe that there are currently more than ten types of homogeneous and heterogeneous crystals known for alumina, among which - AL2O3, Beta-AL2O3, and ALA-AL2O3 (corundum) are the main three crystal forms. According to the different structures, the properties of alumina also vary, but alumina is completely converted to alpha-al2o3 at high temperatures above 1300 degrees.

Activated alumina manufacturer: properties of alumina

Parthian angle: Parthian angle refers to the inclination angle of materials naturally accumulated on a smooth plane, which is an indicator of the flow performance of alumina. The smaller this angle, the better the fluidity of alumina. During the electrolysis process, it is easier to dissolve in the electrolyte, which can better cover the electrolyte shell and result in smaller flight losses.

Specific surface area: Specific surface area is an indicator of the chemical activity of alumina. The statistical method for this area is the sum of the external area per unit mass and the internal pore surface area. The larger the surface area, the better the chemical activity of alumina and the easier it is to dissolve.

Reflection: Reflection refers to the residual crystal water content in alumina.

Cumulative density: Cumulative density is also known as bulk density. Represents the mass of a unit volume item in its natural state. Generally speaking, aluminum oxide with low cumulative density has the fastest electrolyte dissolution rate.

Wear index: The wear index is also a strength indicator of alumina. The smaller the wear index, the greater the strength of alumina.

A-Al203 content: The degree of calcination of alumina is related to the content of Al2O3 in the finished alumina- The higher the Al2O3 content, the more thorough the calcination- A high content of Al2O3 will reduce the hygroscopicity of alumina, but the solubility of ALA-AL2O3 in electrolytes is worse than that of LON-A203.

Particle size: Particle size represents the thickness of alumina particles. Coarse particles can slow down the dissolution rate of alumina in the electrolyte, and even precipitate. Finer alumina can fly in and cause losses.

Activated alumina manufacturer: Uses of alumina

Alumina can be found in many fields such as electronics, petroleum, chemical, refractory materials, ceramics, plastics, textiles, papermaking, pharmaceuticals, etc. Generally, it is special performance aluminum oxide and aluminum hydroxide. But now over 90% of alumina is used as raw material for electrolytic smelting of aluminum.

At present, activated alumina manufacturers believe that there are many types of non gold alumina, with over 300 types, each with excellent physical and chemical properties, but the price is also much higher than that of gold grade alumina.

Activated alumina manufacturers take high-purity superaluminum oxide with excellent characteristics such as high melting point, high hardness, resistance, mechanical properties, wear resistance, corrosion resistance, and heat resistance as an example. Single crystal materials, advanced ceramics, artificial bones, semiconductors, polishing materials, integrated circuit boards, tape fillers, catalysts and their carriers. From the current attention of domestic alumina production enterprises, many companies are striving to develop low sodium alumina, ultrafine AI203, high-purity alumina, activated alumina, sprayed alumina V-AI203、 Aluminum hydroxide, pseudo bobao aluminum, aluminum hydroxide gel and other alumina production.