摘要
利用粉煤灰合成莫来石具有良好的工业发展前景,但由于普通粉煤灰中Al2O3含量较低使得合成莫来石时必须添加大量工业氧化铝,从而增加了合成成本。利用高铝粉煤灰直接制备M50莫来石以及高铝粉煤灰与少量工业氧化铝混合合成M60和M70莫来石,其物理性能可以达到我国《烧结莫来石》标准(YB/T5267-2005),这大大降低了合成成本。研究表明,用未处理过的高铝粉煤灰直接制备低牌号莫来石(M50)适宜的烧结温度为1400℃,用处理过的高铝粉煤灰或合成高牌号莫来石(M60、M70)适宜的烧结温度为1500℃;恒温时间对合成莫来石的影响远小于烧结温度,高温下缩短恒温时间比低温下延长恒温时间有利于莫来石的生成。
Synthesis of mullite from fly coal ash was conducted with a good industrial prospect. Whereas this technique is restricted for higher cost derived from adding Al2O3 to the common fly ash in order to increase a deficient alumina composition to stoichiometric mullite. In this paper, M50 mullite was derived directly from high-alumina fly ash, M60 and M70 mullites from the high-alumina fly ash and industrial a-lumina mixtures were prepared. The physical properties of the sintered mullites could come up to the standard values of sintered mullite of China (YB/T5267-2005). The cost of synthesizing mullite from the high-alumina fly coal ash was largely reduced because of decreasing amount of industrial alumina in preparing mullite. The experimental results showed that the profitable sintering temperature is 1400 ℃for the as-received fly ash in preparing low trademark mullite (M50) , and 1500 ℃ for the beneficiated fly ash and/or in preparing high trademark mullite ( M60 and M70) , respectively. The effect of holding time on sintering nullite is less than that of sintering temperature. Decrease of the holding time at a higher temperature is more profitable than increase of the holding time at a lower temperature during sintering mullite.
出处
《矿物学报》
CAS
CSCD
北大核心
2008年第2期191-195,共5页
Acta Mineralogica Sinica
基金
教育部科技创新工程重大项目培育资金资助(705022)
关键词
高铝粉煤灰
合成莫来石
烧结温度
恒温时间
物理性能
high-alumina fly coal ash
synthesis of mullite
sintering temperature
holding time
physical properties