Brown corundum(brown aluminum oxide ) is bauxite, coke (anthracite) as the main raw materials, in the arc furnace by high temperature smelting, with it made of abrasive tools, suitable for grinding high tensile metal, such as a variety of general steel, malleable cast iron, hard bronze, etc., can also manufacture high-grade refractory materials.
property
Physical properties: triangular crystal system
Chemical properties: both sexes
Reaction with acid: Slightly corroded in aqua regia and hydrofluoric acid
Reaction with alkali: only reacts slightly with strong alkali hot solution
REDOX effect: No
Density: 3.90g/cm3
Hardness: Nupe hardness 2000-2200Kg/mm2, Mohs hardness 9.0
Color: dark brown, dark blue after calcination
Melting point: 2250C
Maximum operating temperature: 1900C
Specific heat: (Cal/g.C)0.26(20-90C)
Thermal conductivity Room temperature 900C
(Cal/cm3.sec.C)
Refractive index: e=1.760w=1.768(Naline)
Resistivity: 30C300C900C1600C(cm)
Linear expansion coefficient: 7-9(0-1600C)
Grade of brown corundum
The main component of brown corundum is alumina, and the classification is differentiated by aluminum content, and the lower the aluminum content, the lower the hardness.
The product particle size is produced according to international standards and national standards, and can be processed according to user requirements. The general particle size is F4~F320, and its chemical composition varies depending on the particle size. The outstanding feature is that the crystal size is small and impact resistant, because of the crushing process with the automill, the particles are mostly spherical particles, the surface is dry and clean, and it is easy to combine with the binder.
