Alumina
Reactive Alumina
Reactive alumina has a very fine particle size and high specific surface area, acting as the matrix component of shaped and unshaped refractories. Low open porosity, excellent sintering reactivity, high purity and reduced water demand optimise the performance of low-cement and cement-free castables.
Typical Analysis
RA standard series
| Composition / Property | 07RA | 15RA | 20RA | Specification limit |
|---|---|---|---|---|
| Al₂O₃ (%) | 99.2 | 99.2 | 99.2 | ≥ 99.0 |
| Na₂O (%) | 0.37 | 0.32 | 0.37 | ≤ 0.45 |
| SiO₂ (%) | 0.08 | 0.08 | 0.08 | ≤ 0.15 |
| Fe₂O₃ (%) | 0.05 | 0.05 | 0.05 | ≤ 0.15 |
| D₅₀ (µm) | 0.8 | 1.5 | 2.3 | ≤ 1.1 / 2.0 / 3.0 |
| BET (m²/g) | 3.5 | 3.1 | 1.5 | ≥ 2.0 / 1.0 / 1.0 |
Special range — mono-modal, low soda
| Composition / Property | L-07 | L-10 | L-14 | L-20 |
|---|---|---|---|---|
| Al₂O₃ (%) | 99.7 | 99.7 | 99.7 | 99.7 |
| Na₂O (%) | 0.09 | 0.09 | 0.08 | 0.06 |
| SiO₂ (%) | 0.03 | 0.03 | 0.03 | 0.03 |
| Fe₂O₃ (%) | 0.01 | 0.01 | 0.01 | 0.01 |
| D₅₀ (µm) | 0.7 | 1.0 | 1.4 | 2.0 |
| D₉₀ (µm) | 3.2 | 3.5 | 4.3 | 5.8 |
| BET (m²/g) | 6.2 | 3.5 | 3.0 | 2.3 |
Special range — mono-modal, standard soda
| Composition / Property | S-08 | S-10 | S-15 | S-20 | S-26 |
|---|---|---|---|---|---|
| Al₂O₃ (%) | 99.6 | 99.6 | 99.6 | 99.6 | 99.6 |
| Na₂O (%) | 0.33 | 0.30 | 0.28 | 0.26 | 0.26 |
| SiO₂ (%) | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Fe₂O₃ (%) | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| D₅₀ (µm) | 0.8 | 1.0 | 1.5 | 2.0 | 2.6 |
| D₉₀ (µm) | 3.5 | 3.5 | 4.6 | 6.1 | 7.2 |
| BET (m²/g) | 4.9 | 3.6 | 3.0 | 2.1 | 1.6 |
Special range — bi-modal and multi-modal
| Composition / Property | B-13 | B-22 | B-25 | B-26 | M-15 |
|---|---|---|---|---|---|
| Al₂O₃ (%) | 99.7 | 99.7 | 99.7 | 99.7 | 99.6 |
| Na₂O (%) | 0.12 | 0.09 | 0.13 | 0.06 | 0.26 |
| SiO₂ (%) | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Fe₂O₃ (%) | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| D₅₀ (µm) | 1.3 | 2.2 | 2.5 | 2.6 | 1.5 |
| D₉₀ (µm) | 4.2 | 7.1 | 7.7 | 8.0 | 9.0 |
| BET (m²/g) | 4.5 | 2.7 | 2.9 | 2.4 | 3.8 |
Key Properties
| Purity | 99.2 to 99.7 % Al₂O₃ |
|---|---|
| Families | Mono-modal low-soda and standard, bi-modal, multi-modal |
| D₅₀ range | 0.7 to 2.6 micron |
| Na₂O range | 0.06 to 0.37 % Na₂O |
| Process | Ball milling |
