以粉煤灰为主要原材料,煤矸石和工业氧化铝为辅料,通过控制物料比例制备了不同Al2O3含量在不同烧结温度下的耐火材料.对所制备材料进行结构性能测试,并借助X射线衍射和扫描电镜对材料进行微观分析.实验结果表明:不同的烧结温度及氧化铝含量对耐火制品的致密性、力学性能、耐火度和晶型状态都有影响.制品在1350 ℃、Al2O3的含量为45%时,其性能指标为:体积密度2.47 g/cm3、常温耐压41 MPa、耐火度1450 ℃、晶型状态以莫来石相和刚玉相为主.该制品的力学性能和使用性能较好,可为进一步利用粉煤灰制备高附加值材料奠定基础.
Fly ash based refractory materials with varied alumina content (by controlling the raw materials with different ratios) at different sintering temperature were prepared using fly ash as the main raw material and coal gangue and industrial alumina as the auxiliary materials.The structural performance of the samples was tested;the microstructure was analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques.The results show that the compactness, mechanical properties, refractoriness as well as crystalline structure of the prepared refractory material are affected by both sintering temperature and alumina content.Desirable performance of bulk density 2.47 g/cm3, compressive strength 41 MPa, refractoriness 1450 ℃, and mullite and corundum as crystalline state are observed for the sample prepared at sintering temperature of 1350 ℃ and alumina content of 45%.The application of fly ash in refractory material preparation is meaningful in producing high-value added products with it.
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