还原铝铬渣作为耐火原料取代白刚玉的可行性研究

Feasibility study on reduced alumina-chrome slag as refractory material to replace white corundum

为开发性能相当、成本低廉的白刚玉替代品,测试了还原铝铬渣的各项基本性能,并与电熔白刚玉的各项性能进行对比,同时还对比了还原铝铬渣和电熔白刚玉在Al_2O_3-SiC-C浇注料中的使用情况。结果表明:1)还原铝铬渣主成分为Al_2O_3,其含量达98%(w)以上,热导率为28.7 W·m^(-1)·K^(-1)(1 400℃),热膨胀系数为8.3×10^(-6)℃^(-1)(1 400℃),耐火度高,抗渣侵蚀性优异。2)还原铝铬渣除显气孔率略高外,其他各项性能均与电熔白刚玉的相当,基本确定其可作为耐火原料使用。3)将还原铝铬渣作为耐火原料替代电熔白刚玉应用于Al_2O_3-SiC-C浇注料后,试样常温、高温各项性能变化不大,对试样的物相无明显影响,满足作为耐火原料的使用要求。

In order to develop a substitute for white corundum with equal performance and low cost,the bas- ic properties of reduced alumina-chrome slag were tested and compared with those of white fused corun- dum. The application of reduced alumina-chrome slag and white fused corundum in AI203-SiC-C castables was also compared. The results show that： （1）the reduced alumina-chrome slag has the main component of AI203（over 98 mass%） ,28.7 W·m^-1·K^-1 of thermal conductivity, 8. 3×10^-6℃^-1（1400℃） of thermal expansion coefficient, high refractoriness under load, and excellent slag corrosion resist- ance; （2）except slightly high apparent porosity, other properties of reduced alumina-chrome slag are equivalent to those of white fused corundum, so it basically can be used as refractory material; （3） for Al2O3-SiC-C castables using reduced alumina-chrome slag instead of white fused corundum,the proper- ties at room temperature and high temperatures and phase composition have little change,which meets the requirements as refractory material.