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I. Core Properties of Magnesium-Chromium Bricks
Magnesium-chromium bricks are basic refractory materials with magnesia (MgO) and chromite ore (Cr₂O₃) as the main raw materials. Their core advantages include:
- Extremely high refractoriness (>2000℃)
- Excellent resistance to alkaline slag erosion
- Good thermal shock stability
- Suitable for high-temperature metallurgy and harsh erosion environments, serving as irreplaceable refractory materials in special scenarios
II. Classification System of Magnesium-Chromium Bricks
(I) Classification by Bonding Method (Core Classification Dimension)
| Type | Bonding Mechanism | Key Performance Characteristics |
| Direct-bonded magnesia-chrome brick | MgO directly reacts with Cr₂O₃ and FeO in chromite to form spinel phase | Strong slag resistance; mainstream application product |
| Silicate-bonded magnesia-chrome brick | Contains abundant silicate phases (CMS, M₂S) | Good thermal shock stability; slightly weaker slag resistance |
| Rebonded magnesia-chrome brick | Fired with pre-synthesized magnesia-chrome spinel clinker | Uniform composition; excellent thermal shock stability |
| Semi-rebonded magnesia-chrome brick | Partially uses pre-synthesized clinker | Performance between direct-bonded and rebonded types |
| Electrically fused rebonded magnesia-chrome brick | Manufactured from electrically fused magnesia-chrome materials | Low porosity; extremely strong erosion resistance; increasing market share |
(II) Classification by Cr₂O₃ Content
- Ordinary magnesia-chrome brick: Cr₂O₃ content 8–18%
- High-chromium magnesia-chrome brick: Cr₂O₃ content >20% (up to 30–40% maximum)
(III) Classification by Special Applications
- Chromium-free/low-chromium ecological magnesia-chrome brick: Replaces chromite with magnesia-alumina spinel, magnesia-iron spinel, etc., to solve hexavalent chromium environmental issues
- Electrically fused rebonded magnesia-chrome brick: Specifically used in extreme erosion environments (highlighted separately for emphasis)