high quality alumina hollow ball for firebrick

Introduction
Alumina hollow sphere is a new type of high temperature insulation material. It is melted in a three-phase electric arc furnace with industrial alumina with an alumina content of 98% or more. The molten liquid alumina is blown into hollow pellets with compressed air. That is, an alumina hollow sphere is obtained, and the crystal form is a-Al2O3 microcrystal. The alumina hollow sphere is the main body, and can be made into various shapes. The maximum use temperature is 1800 degrees Celsius, the mechanical strength of the product is high, several times that of the general lightweight product, and the bulk density is only one-half of the corundum product.
Size
Mixed ball 0.2-5mm
Graded ball 0.2-1mm 1-2mm 2-3mm 3-5mm
Application
1 high temperature, ultra high temperature insulation filler
2 high temperature refractory concrete lightweight aggregate
3 high temperature castable
4 refractory brick
Physical and chemical
Size Al2O3 Fe2O3 SiO2 Na2O MgO K2O CaO
0.2-5mm 99% min 0.15% max 0.3% max 0.5% max 0.1% max 0.1% max 0.1% max
Bulk density Refractory Appearance
0.5-1 g/cm3 1800℃ White hollow ball
Bulk density
Items 5-4mm 4-3mm 3-2mm 2-1mm 1-0.5mm 3-0.2mm 0.5-0.2mm
g/cm3 0.45 0.55 0.65 0.75 0.85 0.85 0.95