| 摘要 |
<p>A free-flowing magnesia and/or chrome ore based basic refractory casting material, containing dilatancy promoting fine refractory material particles and dispersing and wetting agents, is new. A free-flowing MgO and/or chrome ore based basic refractory casting material or highly concentrated aqueous suspension has the composition (by wt.) (a) 76-100% dilatancy promoting MgO and/or chrome ore based refractory material of 0.1-45 microns particle size; (b) 0.1-4% dilatancy promoting dispersing and wetting agents with addition of 20-30 wt. parts water (based on the solids content of the material); (c) optionally 0.1-15% binder; (d) optionally up to 6.5% refractory additive(s) based on Al2O3, Cr2O3, ZrO2, TiO2, SiC, metal powder and carbon source with less than 3 mm particle size; and (e) optionally 0.05-2.5% additive(s) for preventing drying cracks on heating or for improving thermal cycling resistance and for preventing molten metal and/or slag infiltration. INDEPENDENTLY CLAIMED are a free-flowing MgO and/or chrome ore based basic refractory casting material of composition (by wt.) (a') 35-85% MgO and/or chrome ore based refractory material of 0.045-15 mm particle size; (b') 15-50% dilatancy promoting MgO and/or chrome ore based refractory material of 0.1-45 microns particle size; (c') 0.1-4% dilatancy promoting dispersing and wetting agents with addition of 5-10 wt. parts water (based on the solids content of the material); (d') 0.1-15% binder(s); and (e') optionally the above components (d) and (e).</p> |
