Magnesium-chrome castable
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Description:
Magnesium-chrome castable
I. Main Product Types
- Standard type ( MGC-70)
- Ingredients: MgO 60–65%, Cr₂O₃ 8–12%
- Bulk density: 2.9–3.1 g/cm³
- Operating temperature: ≤1650℃
- High-chromium type ( MGC-85)
- Cr₂O₃ content: 15–20%, with the addition of zircon micro powder.
- Improved slag resistance 40%
- Thermal Shock Stability ≥15 cycles (water-cooled at 1100℃)
- Nano‑modified type ( 2025 New Technologies)
- Nanometer MgO–Cr₂O₃ composite powder (particle size ≤ 100 nm)
- Increased intermediate-temperature strength 50%
- Construction Performance Optimization (Self-Leveling Value) ≥280mm)
2. Production Process
- Raw Material Preprocessing System
- Electrofused magnesia ( MgO ≥ 97%) co-ground with chromite (Cr₂O₃ ≥ 35%)
- Particle Size Control: D50 = 15–20 μm
- Composite bonding system
- Phosphate +Silica Fume Dual-Bonding System
- Water-reducing agent dosage 0.1–0.3% (polycarboxylate-based)
- Intelligent Compounding Technology
- Dual-axis forced mixing (rotational speed 45 rpm)
- Water Addition Control: 5.5–6.5% (AI‑driven dynamic adjustment)
3. Application Scenarios
| Application Fields |
Site of Use |
Usage Effectiveness |
| Copper smelting |
Flash Furnace Reaction Tower |
Life expectancy extended to 18 months |
| Cement Industry |
Transition Zone of Rotary Kiln |
Improved anti-scaling performance 60% |
| Hazardous Waste Treatment |
Molten slag line area |
Improved corrosion resistance 3 times |
| Iron and Steel Metallurgy |
RH Refining Furnace Immersion Tube |
Thermal shock stability reaches 25 times |
IV. Performance Advantage Comparison
- Compared with traditional brick linings
- Integrity: Seamless, highly resistant to penetration.
- Easy Maintenance: Local repairs do not require furnace shutdown.
- Lifecycle: Longer than masonry structures 30–50%
V. Physicochemical Indicators ( GB/T 2026-MGC)
1. Basic Performance ( MGC-70 ):
- Withstand Voltage Strength: ≥50MPa ( 110℃ × 24 h )
- Flexural strength: ≥8MPa ( 1400℃ × 3 hours )
- High-Temperature Properties:
- Rate of change of the line: ±0.5% ( 1600℃ × 3 hours )
- Thermal conductivity: 2.8 W/(m·K) (1000℃)
- Special Indicators:
- Resistance to copper slag erosion: ≤2mm Penetration /72h ( 1300℃ )
- Setting time: Initial setting ≥60min , final setting ≤6h
Keywords:
Magnesium-chrome castable
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