以云南省安宁市燃煤发电厂的粉煤灰为主要原材料,辅以生活污水处理厂的活性污泥和工业氧化铝,对粉煤灰应用于耐火行业的可行性进行了理论分析,并通过XRD、SEM等手段进行验证,在使其各项性能基本达标的基础上,探索了粉煤灰耐火砖烧结的最佳温度范围,得到的结果主要有:粉煤灰的掺入量在68%左右,烧结温度为1300 ℃时试样气孔率、吸水率,耐压强度、抗折强度等性能参数达标.XRD结果显示,1100~1300 ℃范围内,随着温度的升高,莫来石波峰逐渐增多,峰值强度逐渐增强.SEM观察发现,在1100~1300 ℃范围内,随着温度的变化莫来石结构逐渐由针状变柱状,1300 ℃时莫来石结构更加紧密,1400 ℃时,莫来石结构松散,柱状莫来石结构变少.
Fly ash based refractory materialsas were prepared using fly ash(from a coal power plant in Anning City) as the main raw material and sludge and industrial alumina the auxiliary materials.viability of their industrial application was analyzed theoretically.The microstructure was analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques.On the basis of meeting the national standard ,we tried to explore the best sintering temperature range.The results show that at sintering temperature of 1300 ℃ and fly ash content of 68%,the incorporation,porosity,water absorption,compressive strength,flexural strength,refractoriness,permanent heating of the product meets the national standard.XRD results indicate that the higher the sintering temperature (1100-1300 ℃),the more and stronger the mullite peaks became.SEM results show that when the sintering temperature is increased from 1100 ℃ to 1300 ℃,the dominant shape of mullite shifted from neddle to columnar.At the temperature of 1300 ℃,dense mullite structure is observed.In comparison,when the sintering temperature is 1400 ℃,less columnar in loose mullite structure is found.
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