White Fused Alumina
White fused alumina is made from excellent industrial alumina by smelting at 2050℃ in arc furnaces at high temperature of 2050℃.It is featured by high purity,good self-sharpening,low grinding heat output,acid-alkali and corrosion resistance,good stability at high temperature,and low porosity,etc.As the main raw material for producing middle/top-class unshaped products,white fused alumina is widely used in ladle castable, iron runner,gun-mix refractory,etc.As for shaped refractories,it’s chiefly used in producing corundum bricks,corundum-mullite saggers,refining-used corundum porous plug bricks,integral blowing lance,three-piece for steel making con-casting production,ultra-high temperatureindustrial furnace lining,and other corundum products. It’s also the high-quality raw material in abrasives,mainly used for producing grinding wheel,grinding and polishing tools,as well as the most promising material with bound less prospects used in military,ship building,glass making,aerospace,optical-instrument-manufacturing,nuclear power plants construction and other industries.
| Chemical composition （%） | Item | Sand | Fines | Mirco powder |
| Al2O3 | ≥99.2 | ≥99 | ≥98.5 |
| SiO2 | ≤0.1 | ≤0.15 | ≤0.15 |
| Fe2O3 | ≤0.08 | ≤0.1 | ≤0.1 |
| Na2O | ≤0.35 | ≤0.4 | ≤0.6 |
| Apparent porosity （%） | ≤8.0 | ≤8.0 | ≤8.0 |
| Moh's hardness | 9 | 9 | 9 |
| Hardness | HV2000-2200 | HV2000-2200 | HV2000-2200 |
| True density（g/cm3） | ≥3.92 | ≥3.92 | ≥3.92 |
| Refractoriness（℃） | ≥1850 | ≥1850 | ≥1850 |