BF Taphole Ramming Mix
BF taphole ramming mix is applied by semi-dry ramming without formwork, Al₂O₃≥70%, 1600℃ max service. Layered ramming gives density and enables rapid hot repair.
Max. Service Temp.1600℃
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Magnesia-Alumina Spinel Castable
Magnesia-alumina spinel castable is an alkaline monolithic refractory made of fused magnesia and alumina-magnesia spinel, offering excellent slag resistance and thermal shock resistance for steel ladle and hot metal ladle working linings.
Technical Data
| Chemical composition MgO | ≥55% |
|---|---|
| Chemical composition Al₂O₃ | ≥20% |
| Bulk density (110℃×24h) | ≥2.85 g/cm³ |
| CCS (110℃×24h) | ≥40 MPa |
| CCS (1500℃×3h) | ≥60 MPa |
| PLC (1500℃×3h) | ±1.0% |
| Max. service temperature | 1700℃ |
Description
Magnesia-alumina spinel castable is a basic monolithic refractory made from fused magnesia, sintered magnesia and high-purity alumina-magnesia spinel, bonded with calcium aluminate cement through scientific particle grading. The in-situ formed or pre-synthesized spinel phase gives the material excellent resistance to basic slag attack and outstanding thermal shock stability, making it a mainstream long-life solution for the working linings of steel ladles, hot metal ladles and other metallurgical vessels.
Key Features
- Excellent slag resistance: The spinel phase effectively resists attack by high-basicity slags and iron oxide, significantly extending service life at the slag line.
- Good thermal shock resistance: Low thermal expansion of the spinel phase adapts to frequent temperature fluctuations during ladle turnover, reducing spalling and cracking.
- High hot strength: High refractoriness under load ensures structural stability under high-temperature service.
- Strong penetration resistance: Dense structure effectively prevents slag and molten steel from penetrating into the lining.
Typical Applications
- Steel ladle working lining (walls and bottom) and slag line
- Hot metal ladle (torpedo car) working lining
- LF refining furnace and ladle refining linings
- Medium-frequency induction furnace lining and lip
FAQs
What is the service temperature range of magnesia-alumina spinel castable?
Standard grades suit service environments of 1550°C–1750°C; special formulations can meet higher temperature requirements.
What advantages does spinel castable have over high-alumina castable?
Under conditions of basic slag and high iron oxide, high-alumina castable is prone to erosion and structural spalling, while spinel castable offers significantly better slag resistance and thermal shock resistance, typically improving campaign life by 30%–50%.
Are there special requirements for installation and curing?
Installation is by vibration casting with strict water addition control. Curing requires a humid environment to avoid rapid water loss; drying follows a heating curve to prevent spalling.
Can the formulation be customized for our ladle conditions?
Yes. We can tailor magnesia grade, spinel addition and bond system according to ladle capacity, slag-line position and turnover rhythm. Please share your operating data for a selection recommendation.
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