Magnesia Alumina Spinel Bricks are advanced alkaline refractory bricks specially developed for high-temperature industrial furnaces requiring excellent thermal stability, corrosion resistance, and long service life.
Manufactured from high-purity magnesia and hercynite spinel raw materials, these bricks combine the advantages of magnesia bricks and spinel refractories, providing outstanding resistance to thermal shock, alkali corrosion, and chemical penetration.
Compared with traditional magnesia chrome bricks, magnesia alumina spinel bricks are environmentally friendly refractory materials that do not contain harmful chromium compounds. They provide excellent kiln coating adherence and stable performance in severe operating conditions, making them an ideal choice for modern dry-process cement rotary kilns.
With high mechanical strength, low thermal conductivity, and excellent resistance to repeated heating and cooling cycles, magnesia alumina spinel bricks help improve furnace efficiency, reduce heat loss, and extend refractory service life.
Physicochemical Parameters
| Items | MFe-88 | MFe-85A | MFe-85B |
|---|---|---|---|
| MgO (%) | 88 | 85 | 85 |
| Fe₂O₃ (%) | 5–6 | 4–6 | 4–6 |
| Al₂O₃ (%) | 4–7 | 3–5 | 3–5 |
| SiO₂ (%) | ≤1.5 | ≤2 | ≤2 |
| Bulk Density (g/cm³) | ≥2.9 | ≥2.95 | ≥2.90 |
| Apparent Porosity (%) | 16 | 17 | 17 |
| Cold Crushing Strength (MPa) | ≥55 | ≥55 | ≥50 |
| Refractoriness Under Load (°C) | ≥1650 | ≥1650 | ≥1600 |
| Thermal Shock Stability | ≥8 | ≥6 | ≥6 |
| Thermal Conductivity (W/m·K) | ≤2.6 | ≤2.6 | ≤2.6 |
| Thermal Expansion (%) | ≤1.7 | ≤1.6 | ≤1.6 |
Product Features
- Excellent Coating Adherence: Magnesia alumina spinel bricks have excellent bonding ability with cement kiln coating layers. A stable coating can effectively protect the refractory lining from direct flame and material erosion, improving kiln operation stability.
- Superior Thermal Shock Resistance: The unique microstructure of magnesia iron spinel provides excellent resistance to rapid temperature changes. The bricks maintain structural integrity during frequent heating, cooling, and kiln shutdown operations.
- Low Thermal Conductivity: With thermal conductivity ≤2.6 W/m·K, these bricks reduce heat transfer through the kiln shell, helping improve thermal efficiency and decrease energy consumption.
- Strong Alkali Corrosion Resistance: Magnesia alumina spinel bricks provide excellent resistance against alkali salts such as Kâ‚‚SOâ‚„, Naâ‚‚SOâ‚„, NaCl, and KCl generated during cement production, preventing chemical corrosion and structural damage.
- High Mechanical Strength: The dense structure provides high cold crushing strength up to 55 MPa, allowing the bricks to withstand mechanical stress, material impact, and long-term high-temperature operation.
- Excellent Penetration Resistance: The low porosity structure effectively prevents slag, molten materials, and chemical substances from penetrating into the brick body, extending furnace lining life.
Applications
Magnesia alumina spinel refractory bricks are widely used in various high-temperature industrial furnaces, especially in applications requiring excellent thermal shock resistance, alkali corrosion resistance, and strong coating adherence.
- Cement rotary kiln firing zones, transition zones, and high-temperature areas requiring excellent coating stability
- Lime vertical kilns and rotary lime kilns exposed to high temperatures and chemical erosion
- Glass melting furnaces, regenerators, and other high-temperature areas requiring thermal stability and corrosion resistance
- Metallurgical furnaces and heating equipment exposed to high temperatures and chemical attack
- Industrial heat treatment furnaces requiring durable alkaline refractory linings
- Circulating fluidized bed furnaces and high-temperature combustion chambers
- Non-ferrous metal processing furnaces and other high-temperature industrial equipment
Customization Services
We provide customized refractory solutions according to different furnace designs, operating temperatures, and service conditions.
Customized Sizes
Standard size:
230×114×65mm
Other customized dimensions are available, including:
- Arch bricks
- Checker bricks
- Wedge bricks
- Knife bricks
- Universal arc bricks
- Special-shaped refractory bricks
Customized Solutions
Our technical team can provide suitable refractory brick solutions based on:
- Furnace structure
- Working temperature
- Chemical environment
- Thermal cycling conditions
- Service life requirements
Packing and Shipping Details
Xintai Magnesia Alumina Spinel Bricks are carefully packed to ensure safe transportation and worldwide delivery.
Packaging:
- Strong wooden pallets
- Moisture-proof plastic wrapping
- Protective corner reinforcement
Shipping Methods:
- Sea freight
- Land transportation
- Customized logistics solutions
Delivery Time:
Normally 20–35 working days depending on order quantity and customization requirements.
Export Service:
Complete export documentation and professional international shipping support are available.
About Xintai Refractory
Xintai Refractory is a professional refractory materials manufacturer with more than 20 years of experience in producing high-quality refractory products.
Our main products include:
Magnesia alumina spinel bricks
High alumina bricks
Fireclay bricks
Insulation bricks
Refractory castables
Ramming masses
Monolithic refractories
Our refractory materials are widely used in cement, steel, glass, ceramics, non-ferrous metals, and power generation industries.
With advanced production equipment, strict quality control systems, and extensive export experience, Xintai provides reliable and cost-effective refractory solutions for customers worldwide.
Contact Xintai Refractory today for customized refractory solutions, technical support, and free quotations.
