Types of Magnesia Spinel Brick
Magnesia spinel refractory bricks are available in two main series: magnesia alumina spinel bricks and magnesia iron (hercynite) spinel bricks. Since their technical parameters and performance characteristics differ, it is essential to choose the appropriate grade for your specific furnace application.
Type 1. Parameter of Magnesia Alumina Spinel Bricks
| Item | Index | |
|---|---|---|
| MgO, % | ≥ | 80 |
| Al2O3, % | ≥ | 10 |
| Apparent Porosity, % | ≤ | 17 |
| Bulk Density, g/cm³ | ≥ | 2.9 |
| Cold Crushing Strength, MPa | ≥ | 50 |
| High-temperature Bending Strength(1350℃*0.5h), MPa | ≥ | 3.5 |
| Thermal Shock Resistances (1100℃, Water Cooling), Cycle | ≥ | 12 |
Type 2. Parameter of Magnesia Iron Spinel Bricks
| Item | MFe-85A | MFe-85B | |
|---|---|---|---|
| MgO, % | ≥ | 85 | 85 |
| Al2O3, % | ≥ | 3-5 | 3-5 |
| Fe2O3, % | ≥ | 4-6 | 4-6 |
| Bulk Density, g/cm³ | ≥ | 2.95 | 2.90 |
| Cold Crushing Strength, MPa | ≥ | 55 | 50 |
| 0.2MPa Refractoriness Under Load, ℃ | ≥ | 1650 | 1600 |
| Thermal Shock Resistance (950℃-Air Cooling), Cycle | ≥ | 100 | 90 |
Common Shapes of Magnesia Spinel Bricks
Standard Straight Bricks Dimension：230x114x65mm (Standard T-3 Straight)
Cement Rotary Kiln Systems (Wedge & Locking Shapes):
VDZ Series: B320, B620, BP20, BP+20, B222, B422, B622, and so on.
ISO Series: Pi 220, Pi 320, etc.
Other Common & Custom Shapes:
Universal Wedge Shapes: T-Series Wedge Bricks (e.g., End Arch/Side Arch Bricks), and others.
Metallurgical & Glass Application Shapes: Ladle Bricks, Checker Bricks (for Glass Regenerators), Skew Bricks, Key/Closure Bricks, and so on.
Customized Refractory Solutions Just for You!
Send REBO your technical drawings, furnace specifications, or operating conditions. Our expert engineering team will custom-engineer the exact brick shapes, precise dimensions, and tailored chemical compositions to fit your specific high-temperature needs. Whether you require standard VDZ sizes, complex custom shapes, or specialized material formulas, we deliver reliable solutions built to maximize your kiln’s service life. Need a tailored solution and direct factory quote? Contact our technical team today!
REBO also offers fully customized packaging. We can print your company logo and shipping marks directly on the pallets and packages.
Proven Reliability Across Global High-Temperature Industries
Trusted by top-tier cement manufacturers and steel producers globally, our refractory solutions continue to deliver reliable high-temperature performance under demanding industrial conditions. Our products are widely applied in critical industrial installations such as cement rotary kilns, secondary refining ladles (LF/VD/VOD), and glass furnace regenerators. With exceptional product consistency and dedicated technical support, we have earned long-term trust and high acclaim from our global partners.
REBO premium magnesia spinel bricks have been successfully exported to over 50 countries and regions, including Syria, Egypt, Saudi Arabia, the UAE, Oman, Indonesia, Brazil, Mexico, Germany, Italy, Poland, Russia, etc.
- 100+ Successful Large-Scale Deployments.
- 98%+ Customer Retention Rate.
- Average Kiln Service Life Extended by 35-50%.
- 100% Compliance on Thermal Shock & Cold Crushing Strength Tests.
- 99.2% On-Time Shipment Rate Across Global Orders.
- 24-Hour Urgent Technical Response & 7-Day Fast Production for Crisis Orders.
Applications of Magnesia Alumina Spinel Bricks
Rotary Kiln: Upper/lower transition zones, decomposition zone, and cooling zone (resistant to thermal shock and alkali attack).
Refining Ladle: Sidewall, bottom, and impact zone (resistant to slag corrosion and steel wash).
RH Degasser: Lower vessel and non-slag line linings.
Regenerator: Upper and middle checkerwork (resistant to alkali vapors and thermal cycling).
Copper/nickel smelting furnaces and hazardous waste incinerators.
REBO is Your Solid Partner in Magnesia Spinel Brick Supplying
High Annual Output: Annual capacity reaches 50,000 metric tons. We guarantee stable supply for large-scale projects.
Ultra-High Firing: Equipped with two 1800°C tunnel kilns. Our bricks feature excellent bonding strength and thermal shock resistance.
Precision Shaping: Powered by 12 high-tonnage hydraulic presses. Our products show uniform density and tight dimensional tolerances.
Direct Source Manufacturer: REBO is an original factory. No middlemen, no extra markups.
Direct Raw Material Access: Direct sourcing from top-quality magnesia bases reduces production costs significantly.
Factory-Direct Pricing: We pass savings directly to you. Enjoy competitive prices and lower purchasing budgets.
Certified Quality Standards: Certified by ISO 9001, ISO 14001, ISO 45001, and CE.
Third-Party Inspection Supported: REBO welcomes random sampling tests by SGS, BV, or other international agencies.
Eco-Friendly & Chrome-Free: Our products meet green, chrome-free standards to help you pass environmental audits easily.
Quick Communication: Our team responds fast and understands your working conditions precisely.
Rapid Quotation: Get competitive price quotes shortly after confirming your needs.
Free Technical Guidance: We provide free lining drawings, brick layout designs, and engineering support.
End-to-End Tracking: Dedicated managers handle your order from production and quality check to final export.
Magnesia Spinel Bricks is The Ultimate Chrome-Free Choice
| Comparison Feature | Magnesia Alumina Spinel Brick | Magnesia Iron Spinel Brick | Magnesia Chrome Brick |
|---|---|---|---|
| Environmental Safety | Green & Chrome-Free | Green & Chrome-Free | Toxic (Produces Cr⁶⁺ at high temps) |
| Coating Ability (Coatability) | Fair | Excellent (Fast & stable coating) | Good |
| Thermal Shock Resistance | Outstanding | High | Moderate |
| Slag & Alkali Resistance | Strong | Strong | Very Strong |
| Primary Industry | Cement, Steel, & Glass | Cement | Non-Ferrous (Phasing out in Cement/Steel) |
| Key Application Zones | Cement: Transition Zones | Cement: Burning Zone (High-temp calcination) | Traditional Cement Kilns (Obsolete) |
| Steel: Ladle Sidewalls & Bottoms | Non-Ferrous Smelting Slag Lines | ||
| Glass: Regenerator Checkers | / |
Slight Color Differences Do Not Affect Brick Performance
While these visual variations occur naturally during magnesia spinel brick production, they are purely aesthetic and do not impact structural integrity. As long as physical and chemical properties meet quality standards, the bricks will deliver full service life and peak performance in your furnace.
Raw Material Impurities
Magnesia alumina spinel bricks are naturally light (off-white, light grey, light yellow-brown). Iron or titanium impurities cause minor color shifts. Higher purity gives a whiter color.
Magnesia-iron spinel bricks are naturally dark (dark brown, near-black). Iron is added on purpose. This gives them a deep brown or black color.
Kiln Atmosphere
Oxygen-rich firing: iron turns reddish-brown or yellow-brown.
Oxygen-poor firing: iron turns dark grey, green-brown, or black-brown.
Thick bricks may have a darker inside. This is called “black core.”
Firing Temperature & Time
Higher heat (1800°C) and longer firing improve crystal growth.
Small temperature differences in the kiln cause slight surface shade changes.
