KR desulfurization stirrer castable is a mullite-corundum based monolithic for the outer lining of KR hot metal desulfurization impellers. Low-cement bonded and integrally cast, it resists hot metal and slag attack and thermal shock, delivering stable service life.
| Al₂O₃ content | ≥ 75% |
|---|---|
| Bulk density | ≥ 2.75 g/cm³ |
| CCS (1100℃×3h) | ≥ 60 MPa |
| MOR (1100℃×3h) | ≥ 8 MPa |
| PLC (1450℃×3h) | ± 0.5% |
| Thermal shock (1100℃ water) | ≥ 8 次 |
| Service temperature | ≥ 1450℃ |
In the KR (Kambara Reactor) desulfurization process, a cross-shaped stirrer with a refractory castable lining is immersed into the hot metal ladle. Its rotation creates a vortex that draws CaO-based desulfurizer into the melt for full contact and reaction. The castable lining directly faces hot metal at about 1300–1450°C, chemical attack from desulfurizing slag, mechanical erosion from rotation, and repeated thermal shock as the stirrer is immersed and withdrawn each heat.
Board corundum provides erosion and wear resistance; mullite improves thermal shock resistance. Reactive alumina micropowder and microsilica enable a low-cement matrix with reduced CaO content. Optimized particle grading and admixtures achieve low water demand and high density for rapid strength development.
The stirrer is integrally cast by vibration, cured in the mold, demolded and dried, then baked slowly to above 1100°C before use. Heating rate must be controlled to avoid explosive spalling. A short low-speed conditioning run is recommended before normal desulfurization.
Henan Songrui New Refractory Materials Co., Ltd. customizes formulations for different hot metal ladle capacities and stirrer structures, with on-site installation guidance.
Mainly thermal shock cracking and slag-metal attack, plus baking quality and stirrer design (anchor type, rounded blade corners). Good design and baking extend lining life significantly.
V-shaped anchors welded on the metal core lock the integrally cast lining, forming a mechanical interlock plus sintered bond after baking.
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