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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 |
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