Alumina-magnesia ladle castable (Al2O3-MgO) with in-situ spinel formation offers excellent slag resistance, thermal shock resistance and longer service life, ideal for integral lining and repair of steel ladles.
| Al2O3 content | 75%～85% |
|---|---|
| MgO content | 6%～10% |
| Bulk density (110℃×24h) | ≥ 2.85 g/cm³ |
| CCS (110℃×24h) | ≥ 30 MPa |
| CCS (1500℃×3h) | ≥ 60 MPa |
| MOR (1500℃×3h) | ≥ 8 MPa |
| PLC (1500℃×3h) | 0～+0.8% |
| Refractoriness | ≥ 1790℃ |
| Service temperature | 1650～1750℃ |
Alumina-magnesia ladle castable (Al2O3-MgO castable) is an alumina-magnesia composite unshaped refractory made from high-grade bauxite and corundum aggregates with sintered magnesia and high-efficiency binders. Its key technology lies in the in-situ formation of magnesia-alumina spinel (MgAl2O4) at high temperature, which creates a dense bonding layer with slight expansion and inhibits slag penetration. Compared with conventional high-alumina castables, it offers significantly better resistance to basic slag attack, thermal shock and spalling, making it an ideal choice for integral lining, repair and slag line of steel ladles.
Alumina-magnesia castable forms in-situ spinel at high temperature, giving much better basic slag resistance and thermal shock resistance than ordinary high-alumina castable. It suits ladle and other severe slag attack conditions; high-alumina castable fits relatively lower-temperature, mild-erosion parts.
The slag line is exposed to high-basicity molten slag. MgO in the castable reacts with Fe2O3 and CaO to form high-melting spinel protective layer, effectively slowing slag line erosion.
Yes. Formulation can be adjusted for scouring resistance for iron ladle service; the solution is customized by Henan Songrui New Refractory Materials Co., Ltd. based on ladle type.
Yes. Low-cement, ultra-low-cement and self-flowing formulations are available, with on-site installation and baking guidance.
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