What are the indicators to characterize the physical properties of alumina(aluminum oxide)?

(1) Resting Angle: The resting Angle of alumina refers to the inclination Angle of natural accumulation of materials on a smooth plane. The smaller the resting Angle, the better the alumina fluidity.

(2) -- Al2O3 content: The content of -- Al2O3 in alumina reflects the roasting degree of alumina. The higher the roasting degree is, the more the content of -- Al2O3 is, and the hygroscopicity of alumina becomes worse with the increase of -- Al2O3 content.

(3) Volume density: The volume density of alumina refers to the mass of the material per unit volume in the natural state. Generally, small volume density of alumina is conducive to the dissolution in the electrolyte.

(4) Particle size: The particle size of alumina refers to its thickness. Alumina must be of appropriate particle size, too coarse to dissolve in electrolytes, slow, or even precipitation. It is easy to fly over the details and lose.

(5) Specific surface area: The specific surface area of alumina refers to the total surface area of the sum of the surface area and internal pore surface area of the material per unit mass, which is an important index to show the activity level of the material. Alumina with large specific surface area has good solubility and high activity in electrolytes, but it is easy to absorb moisture.

(6) Coefficient of wear: the coefficient of wear refers to the percentage change in the fraction of alumina in a sample less than 45 m after wear in a fluidized bed under certain conditions. Wear coefficient is a physical index of alumina strength.