Features:
WFA as a superior refractory material, is produced by melting high-quality industrial alumina powder in an electric tilting furnace at temperatures exceeding 2200℃. Afterward, it undergoes cooling to achieve its white color while maintaining α-Al2O3 as the primary crystal phase.
It serves as the fundamental ingredient in the manufacturing of premium unshaped and shaped refractories, finding extensive application across multiple industries.
1. White corundum powder is widely used in steel, cement, ceramics, petroleum and other industries.
2. It is an ideal raw material for making large-scale ladle castables, medium and high-grade iron trough castables, gunning materials, preforms and other unshaped refractory materials.
3. It is also the main raw material for various corundum products such as corundum bricks, corundum and mullite corundum saggers, corundum porous plugs for refining, integral spray guns and composite nozzles, and high-temperature industrial furnace lining materials.
Chemical Composition
| Chemical Composition | Grit > 0.1mm | Typical Value | Fine Powder ≤ 0.1mm | Typical Value |
| Al2O3%≥ | 99.2 | 99.5 | 99 | 99.3 |
| SiO2%≤ | 0.1 | 0.03 | 0.15 | 0.08 |
| Fe2O3%≤ | 0.1 | 0.03 | 0.1 | 0.06 |
| K2O+Na2O%≤ | 0.35 | 0.25 | 0.4 | 0.3 |
| Apparent Porosity %≤ | 8 | 6 | ||
| Common Bulk Density g/cm3≥ | 3.6 | 3.65 | ||
| High Bulk Density g/cm3≥ | 3.68 | 3.72 | ||
| True Density g/cm3≥ | 3.9 | 3.93 | 3.9 | 3.93 |
Chemical Composition Of Low Sodium, Micro Sodium White Fused Alumina
| Chemical Composition | Low Sodium | Micro Sodium | ||
| Guarantee Value | Typical Value | Guarantee Value | Typical Value | |
| Na2O % ≤ | 0.15 | 0.08 | 0.08 | 0.02 |
| Al2O3 % ≥ | 99.4 | 99.7 | 99.6 | 99.8 |
| SiO2 % ≤ | 0.1 | 0.05 | 0.1 | 0.05 |
| Fe2O3 % ≤ | 0.05 | 0.02 | 0.05 | 0.02 |
Particle Size Composition Standard
| Specification | Coarse Grain | Basic Grain | Fine Grain | ||
| Mesh Size （mm） | Mass Percent Of Oversize （%） | Mass Percent （%） | Mesh Size（mm） | Mass Percent Of Undersize （%） | |
| 25 ~ 15 | 20 | ≤ 8 | 83 | 115 | ≤ 9 |
| 15 ~ 10 | 15 | 110 | |||
| 8 ~ 5 | 8 | 5 | |||
| 5 ~ 3 | 5 | 3 | |||
| 3 ~ 1 | 3 | 1 | |||
| 1 ~ 0 | 1 | 0.075 | ≤ 10 | ||
| 1 ~ 0.5 | 0.5 | ≤ 9 | |||
| 1 ~ 0.3 | 0.3 | ||||
| 0.5 ~ 0 | 0.5 | 67 | 0.075 | ≤ 25 | |
| 0.3 ~ 0 | 0.3 | 82 | 0.045 | ≤ 10 | |
| 0.2 ~ 0 | 0.2 | 77 | ≤ 15 | ||
| 0.088 ~ 0 | 0.09 | ≤ 10 | 90 | ||
| 0.074 ~ 0 | 0.075 | ||||
| 0.044 ~ 0 | 0.045 | ||||
Note: Various section sand and fine powder can be processed according to customer needs.
1. Low sodium and micro sodium WFA can be provided. Na2O can be less than 0.1%.
2. Bulk density can really reach 3.6 g/cm3, which can meet needs of various high-grade refractory materials.
3. Yufa uses a dumping furnace with a diameter of 6.5m to conduct 24-hour smelting operations to pursue high and stable quality.
4. Various specifications can be customized.
Our bulk density can reach 3.6 g/cm3，others are around 3.55 g/cm3.
The Na2O of our common WFA is below 0.3%.
The Na2O of our low sodium WFA is below 0.2%.
The Na2O of our micro sodium WFA is below 0.1%.
All our melting furnaces are tilting with a diameter of 6.5 m.
We have 8 Barmac crushers.
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