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Dense alumina for refractories also called dense fused alumina for refractories, is a high-end refractory material made from the reduced fusion of high purity industry alumina powder and reducing agent in an electric arc furnace. Its main content is α-aluminum-oxide(α-Al2O3) and looks dark gray or light gray. The fused alumina through cooled down, crushed, and graded into grits/grains suitable for refractory applications. Its Al2O3 content is over 98%; the porosity rate is less than 4%. It is acid and alkali-resistant, slag-resistant, abrasion-resistant, anti-heat shock, and has stable chemical content. Dense fused alumina is widely used in the steelmaking industry, metallurgical, ceramic, glass, construction materials, shaped refractory and unshaped refractory; the available size is 0-1mm, 1-3mm, 3-5mm, 5-8mm.
Dense fused alumina is a high-grade refractory material with a main crystal phase of more than 98% and porosity of less than 4%; it has the advantages of good acid and alkali resistance, and good wear resistance under high temperature, corrosion resistance, and volume stability. It is widely used in metallurgical, petrochemical, building materials, ceramic, and other industries.
Application of dense fused alumina for refractories 1-3mm, 3-5mm, 5-8mm：
Physical properties of dense fused alumina for refractories 1-3mm, 3-5mm, 5-8mm：
| Item | Index |
| Color | Grayish-White |
| Crystal form | α-Al2O3 |
| Hardness (Mohs) | ≥9.0 |
| Melting Point (℃) | 2250 |
| Maximum Working Temperature（℃） | 1900 |
| True Density（g/cm3） | ≥3. 90 |
| Linear Thermal Expansion（0—1600℃） | 7—9 |
| Apparent Porosity (%) | ≤2 |
| Bulk density (g/cm3) | ≥3.9 |
Chemical compositions of dense fused alumina for refractories 1-3mm, 3-5mm, 5-8mm：
| Chemical Compositions | Refractories | Typical Value |
| Al2O (%) ≥ | 99.2 | 99.6 |
| SiO2 (%) ≤ | 0.5 | 0.4 |
| Fe2O3 (%) ≤ | 0.1 | 0.03 |
| TiO2 (%) ≤ | 0.1 | 0.05 |
| CaO (%) ≤ | 0.1 | 0.05 |
| MgO (%) ≤ | 0.1 | 0.05 |
| Na2O (%) ≤ | 0.1 | 0.05 |
| C (%) ≤ | 0.1 | 0.08 |
MicroBlasting is extremely efficient and precise, so it is hardly likely you will need to recycle abrasive, but it is important to know the risk involved. Unlike grit or bead blasting, a MicroBlasting system can only cycle abrasive once. Abrasive should not be reclaimed and reprocessed for a second pass
We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
The description of the grain shape can range from “angular” to “acicular” to “spherical”. When the value of the dimensionless form factor is 1, the grain is spherical. The smaller the form factor, the pointier the grain.
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.
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Over the past 18 years, TAOANG products range from raw material bauxite to processing follow-up products brown fused alumina, finishing white fused alumina and dense fused alumina, bubble alumina, and fused alumina micro powder. The production process is
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Raw materials containing aluminium oxide are electrothermally melted at a reaction temperature of more than 2,000 °C to produce the various fused aluminas. Different starting materials are used depending on the desired type of fused alumina. For instance,
