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White fused alumina for refractories 5-8mm
White fused alumina for refractories 5-8mm refers to white fused alumina grain with a particle size range of 5mm-8mm. White fused alumina also is known as WFA. It is produced by smelting industry alumina powder in an electric arc furnace at more than 2000°C. Large blocks of white fused alumina produced by the smelting workshop are transported to the section sand production workshop, broken by the coarse crusher, and then screened; finally, White Fused Alumina products with particle sizes within a range of 5-8mm. It is the primary raw material for shaped refractory, unshaped refractory, and other applications.
Introduce white fused alumina for refractories 5-8mm:
White fused alumina is an artificial material made by the fusing process. WFA is a high-grade refractory raw material and a commonly used wear-resistant material. The main crystal phase of fused white alumina is α-Al2O3 (Alpha Aluminum oxide). The colour is white and flawless. The production process of white fused alumina is melting and recrystallizing high-purity industrial alumina powder at temperatures up to 2250 °C.In addition, there are a small number of impurities such as Na2O, SiO2, and Fe2O3 in the alumina powder. In the molten process, sodium oxide and aluminium oxide will generate β-Al2O3 (Na2O·11Al2O3). And it will increase as the content of Na2O increases. β-Al2O3 has a low melting point, low bulk density, and low hardness. When the white fused alumina blocks are cooled and crystallized, β-Al2O3 will precipitate in the upper part of white fused alumina lumps. That will seriously affect the refractory performance and hardness of the white-fused alumina material.
Chemical composite and physical properties of white fused alumina for refractories 5-8mm:
| Items | Grain |
| Al2O3 | 99.3%min |
| SiO2 | 0.10%max |
| Fe2O3 | 0.10%max |
| Na2O | 0.30%max |
| Melting point(℃) | 2250 |
| Real density(g/cm3) | 3.90min |
| Refractoriness （℃） | ≥1900 |
| Colour | White |
| Size | 5mm-8mm |
Product features of white fused alumina for refractories 5-8mm:
- High hardness: Mohs hardness is 9.0, and Vickers hardness(HV) is 2000-2200.
- Good toughness: For example, the compressive strength of white fused alumina F120 is 100KN/cm2.
- High density: The volume density of WFA is 3.6g/cm3.
- High-temperature resistance with low thermal conductivity and low coefficient of linear expansion. So it can resist thermal shock.
- PH value: White fused alumina is a neutral substance with a PH value of 7.0-8.0.
- High resistance to chemical corrosion. White fused alumina is resistant to most acid and alkali materials.
Applications of white fused alumina for refractories 5-8mm:
- Refractory aggregate for ladle in the steel-making industry.
- Kiln construction.
- Furnace building.
- Refractory bricks.
- Ceramic Tiles special ceramics.
- Technical ceramics.
White Fused Alumina（FAQ）
What is the structure?
Structure is basically the spacing between abrasive grains. An open structure would be 12 or higher while a closer structure would be 6 or so. Here again, the structure depends on a variety of factors not the least of which is how difficult the material is to grind.
How about your delivery time?
Generally, it will take 30 to 60 days after receiving your advance payment. The specific delivery time depends .on the items and the quantity of your order.
What is porosity?
Porosity is defined as the gas proportion (cavity volume) of a particle’s total volume. It can be determined using different measurement techniques, such as gas adsorption and mercury porosimetry. With the same grain size and shape, a lower bulk density corresponds to a higher porosity of the grains.
Can you customized quality, size, package according to customer?
Yes, of course. The OEM is available. We will do the creation in your requirement and make ur image come true.
What’s lead time for bulk order?
1)for 5~25 tons, it takes around 10~15days. 2)For 26~200 tons,20-40days We will try to deliver it with the promise of quality guarantee as soon as possible
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