Fused Magnesia-Alumina Spinel
Refractory Raw Materials SeriesHigh-purity fused magnesia-alumina spinel is smelted in large high-temperature electric arc furnaces using high-purity magnesia and industrial alumina. It features high density, high refractoriness, superior high-temperature volume stability, outstanding resistance to alkaline slag attack/penetration, and excellent thermal shock stability. Widely used in steelmaking, cement kilns, lithium battery saggers, and specialized plasma coatings.
| Parameters | Specifications |
|---|---|
| Grades | AM-65 / AM-70 / AM-90 |
| Al₂O₃ Content | 64% ~ 90% (By Grade) |
| MgO Content | 9% ~ 35% (By Grade) |
| Bulk Density | ≥ 3.2 ~ 3.3 g/cm³ |
| Particle Size | 0~0.2~0.5~1~2~3~5~8mm Aggregates; 100, 200, 325 Mesh Fines; 5μm Micro-powder |
| Inspection Standard | GB5069-2001 |
| Packaging | 25kg PP bags, 1000kg bulk bags (Customizable upon request) |
Material Introduction
High-purity fused magnesia-alumina spinel is produced by smelting high-purity magnesia and calcined alumina powder in an electric arc furnace at elevated temperatures. It delivers high bulk density, high refractoriness, excellent high-temperature volume stability, exceptional resistance to basic slag erosion/penetration, and remarkable thermal shock resistance.
Introducing magnesia-alumina spinel into refractories significantly improves the flowability, penetration resistance, corrosion resistance, and spalling resistance of castables. It substantially enhances erosion resistance, prolongs service life, reduces refractory consumption per ton of steel, and effectively prevents cracking issues associated with pure magnesia raw materials.
Key Characteristics
- High Bulk Density & Refractoriness: Complete crystal growth achieved through high-temperature arc smelting, with bulk density reaching ≥ 3.2~3.3 g/cm³.
- Superior High-Temperature Volume Stability: High creep resistance with minimal shrinkage or deformation under prolonged ultra-high temperature operations.
- Outstanding Basic Slag & Penetration Resistance: High chemical inertness against molten steel, alkaline slags, and corrosive melts.
- Excellent Thermal Shock & Spalling Resistance: Moderate thermal expansion ensures resilience against rapid temperature cycling and severe thermal shocks.
- Enhanced Workability & Performance: Helps improve refractory castable fluidity, reduce refractory consumption per ton of steel, and mitigate cracking associated with magnesia additions.
Physical & Chemical Indicators of Fused Spinel
| Grade | Chemical Composition (%) | Bulk Density (g/cm³) | |||||
|---|---|---|---|---|---|---|---|
| Al₂O₃ | MgO | CaO | SiO₂ | Fe₂O₃ | Na₂O | ||
| AM-65 | 64 ~ 66 | 33 ~ 35 | ≤ 0.65 | ≤ 0.50 | ≤ 0.40 | ≤ 0.30 | ≥ 3.3 |
| AM-70 | 74 ~ 76 | 23 ~ 25 | ≤ 0.55 | ≤ 0.40 | ≤ 0.40 | ≤ 0.30 | ≥ 3.2 |
| AM-90 | 87 ~ 90 | 9 ~ 12 | ≤ 0.30 | ≤ 0.25 | ≤ 0.30 | ≤ 0.40 | ≥ 3.3 |
| Particle Sizes | 0~0.2~0.5~1~2~3~5~8mm Aggregates; 100 mesh, 200 mesh, 325 mesh Fines; 5μm Micro-powder | ||||||
| Standard | GB5069-2001 | ||||||
| Packaging | 25kg PP bags, 1000kg bulk bags (Customizable according to client requirements) | ||||||
Primary Applications
- Steel Metallurgy: EAF roofs, converters, steel ladles, porous purging plugs / well blocks, RH spinel bricks / backing castables, tundish flow stabilizers & impact pads.
- Cement Industry: Upper/lower transition zones and burning zones of large rotary cement kilns.
- Non-Ferrous & Glass: Alloy melting furnaces and glass regenerator chambers.
- New Energy & Special Coatings: Lithium-ion battery saggers and advanced plasma thermal spray coatings.
