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Magnesia-alumina spinel ladle ramming mass
Because the magnesia-alumina spinel with the characters of strong resistance to slag erosion, excellent thermal shock resistance and high temperature strength, it is more and more used as steel-making refractory material.
Magnesia-alumina spinel castable refractory used in the ladle is made of superior bauxite, high quality synthetic spinel, additive and binding agent, it is with excellent slag corrosion resistance, high temperature resistance, good thermal shock resistance performance, also with long service time, safe and stable advantages, which is the ideal ladle lining material, it can be directly poured into lining and can be made into precast blocks.
| Item | LMJ-70 | LMJ-65 | LMJ-60 | |
| Al2O3 (%) ≥ | 75 | 65 | 60 | |
| MgO (%) ≥ | 8 | 8 | 8 | |
| Bulk density 110℃×24h dry off (g/cm3) ≥ | 2.65 | 2.5 | 2.4 | |
| Cold crushing strength 110℃×24h dry off (MPa) ≥ | 30 | 25 | 20 | |
| Bending strength 110℃×24h dry off (MPa) ≥ | 7.5 | 7.5 | 7.5 | |
| Setting time (min) | Initial setting time | 45 | 45 | 45 |
| Final setting time | 720 | 720 | 720 | |
| Reheat linear change 110℃×24h (%) | 0~-0.4 | 0~-0.4 | 0~-0.4 | |
| The highest service time (℃) | 1730 | 1700 | 1680 | |
