Magnesia-chrome refractory brick
Category:
Description:
Alkaline refractory brick
Technical Specification for Magnesia-Chrome Bricks
Main Types
- Direct-bonded magnesia-chrome bricks ( MG-15)
- Ingredients: MgO 60–70%, Cr₂O₃ 12–18%
- Features: Direct bonding rate ≥85% at 1700℃
- Thermal shock resistance: ≥30 cycles (1100°C water cooling)
- Electrofused re-bonded magnesia-chrome brick ( MGR-20)
- Electrofused synthetic material ≥80%
- Apparent porosity ≤ 14%
- Enhanced slag resistance 50%
Production process
- Raw material pre-firing (magnesia) 1800℃, chromite ore 1600℃)
- High-pressure molding ( 300–400 MPa)
- Ultra-high temperature firing ( 1750–1850°C/24 h)
- Dimensional finishing (accuracy ±0.3 mm)
Technical Specification for Magnesia-Alumina Bricks
Type of Innovation
- Spinel-reinforced ( MA-85)
- MgO 80–85%, Al₂O₃ 10–15%
- Spinel phase ≥25%
- Thermal conductivity: 2.1 W/(m·K)
- Gradient Composite Magnesia-Alumina Brick
- Working surface: Corundum coating ( 100 μm)
- Transition layer: MgO/Al₂O₃ = 70/30
- Backer layer: Porous structure (porosity 30%)
Key Process
- Spinel pre-synthesis ( 1600℃)
- Nanometer-scale ingredients ( D50 ≤ 1 μm)
- Atmosphere-Controlled Sintering (Nitrogen Protection)
Technical Specification for Magnesium-Zirconia Bricks
New product
- Zirconia-toughened ( MZ-10)
- ZrO₂ 8–12% (sub-micron grade)
- Improved fracture toughness 3 times
- Excellent creep resistance at 1700℃
- Magnesium zirconate composite brick ( MZ-20)
- MgZrO₃ primary crystalline phase
- Enhanced alkali resistance 60%
- Reduced life-cycle cost 40%
Application Comparative Analysis
Brick type
|
Best Use Cases
|
Economic benefits
|
Magnesium-chromium brick
|
Copper Smelting Slag Line
|
Lifespan: 12–18 months (traditional: 8 months)
|
Magnesium-aluminum brick
|
Cement Kiln Transition Zone
|
Heat consumption reduced by 0.8 GJ per ton of clinker
|
Magnesium-zirconia brick
|
Glass furnace regenerator
|
Maintenance interval extended to 5 years
|
Physicochemical indicators
- High-Temperature Performance Comparison ( GB/T 2026 ):
| Indicator | Magnesium-chromium brick | Magnesium-aluminum brick | Magnesium-zirconia brick |
| Load-Softening Point (℃) | ≥1700 | ≥1650 | ≥1680 |
| Thermal shock stability ( next time ) | 30 | 35 | 25 |
| Slag resistance (mm) | ≤1.5 | ≤2.0 | ≤1.0 |
- Environmental protection indicators:
- Hexavalent chromium leaching amount: ≤0.07 mg/L (New-type chromium-free product)
- Heat recovery rate: ≥75% (Waste Brick Recycling)
Keywords:
Magnesia-chrome refractory brick
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Email:zzjsrefractory@gmail.com
Address: Chengguan Industrial Zone, Xinmi City, Henan Province
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