Fused Magnesia-Alumina Spinel
1. High purity and stable performance High-purity light-burned magnesia and industrial alumina powder provide low impurity levels for stable refractory performance. 2. High refractoriness A melting point of approximately 2135℃ and refractoriness of 1770-2000℃ suit various industr...
Read the full description- Color
- White to light gray
- Grade
- AM-65, AM-75
- Mesh size
- 100 mesh, 200 mesh, 325 mesh
- Melting point
- Approximately 2135℃
Bodan supplies this item to specification. Share the material, machine and required finish and we will confirm the grade, dimensions and packing for your order.
Advantages
Key features
-
High purity and stable performance
High-purity light-burned magnesia and industrial alumina powder provide low impurity levels for stable refractory performance.
-
High refractoriness
A melting point of approximately 2135℃ and refractoriness of 1770-2000℃ suit various industrial furnaces.
-
Good thermal shock resistance
Low thermal expansion and excellent thermal shock resistance help prevent cracking during rapid heating and cooling.
-
Strong corrosion resistance
Excellent resistance to basic slags and slag penetration.
-
High bulk density
Bulk density ≥3.2-3.3 g/cm³ provides high compactness and good volume stability at high temperature.
-
Environmentally friendly
A suitable alternative to magnesia-chromia refractories that eliminates Cr⁶⁺ contamination.
Technical data
Specifications
- Color
- White to light gray
- Grade
- AM-65, AM-75
- Mesh size
- 100 mesh, 200 mesh, 325 mesh
- Melting point
- Approximately 2135℃
- Particle size — Metric
- 0-0.2 mm, 0-1 mm, 1-3 mm, 3-5 mm, 5-8 mm, 5 μm
- Crystal system
- Cubic crystal system
- Refractoriness
- 1770-2000℃
- Apparent porosity
- ≤5%
- Max service temperature
- 1800℃
- Magnetic material content
- ≤0.05%
Product details
About this product
Product Overview
Fused magnesia-alumina spinel (MA spinel) is a high-purity synthetic refractory raw material made from high-purity light-burned magnesia and industrial alumina powder by arc melting above 2000℃, followed by cooling and crystallization. Its main phase is MgAl₂O₄, with a cubic crystal system and a melting point of 2135℃.
Fusion produces fully developed, large crystals with high density and purity and few internal defects, offering improved corrosion and wear resistance in high-performance precast shapes and premium shaped bricks.
Sized aggregate grades include 0-1, 1-3, 3-5 and 5-8 mm; fine powders include 100, 200 and 325 mesh, with 5 μm micropowder also available. Other specifications can be customized.
Core Advantages
1. High purity and stable performance
High-purity light-burned magnesia and industrial alumina powder provide low impurity levels for stable refractory performance.
2. High refractoriness
A melting point of approximately 2135℃ and refractoriness of 1770-2000℃ suit various industrial furnaces.
3. Good thermal shock resistance
Low thermal expansion and excellent thermal shock resistance help prevent cracking during rapid heating and cooling.
4. Strong corrosion resistance
Excellent resistance to basic slags and slag penetration.
5. High bulk density
Bulk density ≥3.2-3.3 g/cm³ provides high compactness and good volume stability at high temperature.
6. Environmentally friendly
A suitable alternative to magnesia-chromia refractories that eliminates Cr⁶⁺ contamination.
Technical Specifications
| Grade | Al2O3 | MgO | SiO2 | Fe2O3 | CaO | Na2O | Bulk density (g/cm³) |
|---|---|---|---|---|---|---|---|
| AM-65 | 64-66% | 33-35% | ≤0.50% | ≤0.40% | ≤0.65% | ≤0.30% | ≥3.3 |
| AM-75 | 74-76% | 23-25% | ≤0.40% | ≤0.40% | ≤0.65% | ≤0.30% | ≥3.2 |
Physical Properties
| Item | Property |
|---|---|
| Color | White to light gray |
| Crystal form | Cubic crystal system |
| Melting point | Approximately 2135℃ |
| Maximum service temperature | 1800℃ |
| Refractoriness | 1770-2000℃ |
| Magnetic material content | ≤0.05% |
| Apparent porosity | ≤5% |
Applications
Steelmaking: ladle walls, purging plugs and well blocks, RH refining-furnace spinel bricks and backup castables, slide gates, continuous-casting plates and nozzle bricks
Refractory products: premium alumina-magnesia bricks, magnesia-alumina spinel bricks and corundum-spinel castables
Monolithic refractories: high-performance alumina-magnesia castables, ramming mixes and precast shapes
Cement: transition-zone lining bricks in large rotary kilns
Other applications: alloy smelting, lithium-battery saggers and specialized plasma-spray coatings
Adding fused magnesia-alumina spinel improves castable flow, penetration resistance, corrosion resistance and spalling resistance, particularly erosion resistance. This extends service life and reduces refractory consumption per ton of steel.
Packaging
25 kg plastic woven bags / 25 kg per bag / Small orders and samples
Bulk bags / 1000 kg (1 ton) per bag / Large industrial orders
25 kg bags in a bulk bag / 40 × 25 kg bags per bulk bag / Flexible handling and efficient transport
Custom Packaging Service
Custom packaging can include specific capacities, labels and branding.
Use and Storage Recommendations
1. Combine sized aggregate and fine powder
In refractory castables, aggregate forms the structural skeleton and fine powder fills the matrix voids. Select a suitable grading according to the formulation.
2. Storage Conditions
Store in a dry, ventilated place. Protect against moisture and contamination during transport and do not exceed specified stacking heights.
Frequently Asked Questions
How does fused magnesia-alumina spinel differ from sintered spinel?
Fusion fully melts the raw materials in an electric arc furnace above 2200℃ before cooling and crystallization, producing large, well-developed crystals with high density and purity. Sintering uses solid-state reactions at 1700-1850℃ below the melting point, producing finer, more reactive grains. Fused spinel is better suited to high-performance precast shapes and premium shaped bricks.
How do AM-65, AM-75 and AM-90 differ?
The main difference is the Al₂O₃-to-MgO ratio. AM-65 contains approximately 64%-66% Al₂O₃ and 33%-35% MgO; AM-75 contains approximately 74%-76% Al₂O₃. Select a grade according to temperature and corrosion-resistance requirements.
Can the product be used in high-temperature steelmaking environments?
Yes. High refractoriness and excellent slag resistance support use in ladle linings, RH refining furnaces and slide gates.
Are custom particle sizes available?
Yes. Aggregate from 0-0.2 to 5-8 mm, fine powder from 100 to 325 mesh and 5 μm micropowder are available, with other specifications on request.
What is the minimum order quantity?
Standard orders start from one 25 kg bag. Bulk bags are normally shipped as complete units.
Resources
Documents
Data sheets, test reports and packing details for this product are issued on request. Send an inquiry and our technical team will return the documents that match your application.
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