按不同SiO2掺量(质量分数)进行垃圾焚烧飞灰的水泥固化试验,研究了SiO2掺量对熟料试样的重金属分布、浸出毒性的影响.结果表明,SiO2掺量低于16％时,提高掺量有利于增加熟料中Cr、Ni、Cu、As固溶率;但SiO2掺量超过16％后,重金属固溶率与其成反比.Cd、Pb、Zn的挥发率随SiO2掺量增加而减少,掺加SiO2能明显抑制Zn的挥发,但基本不影响Hg的挥发.SiO2掺量增加后熟料结构进一步致密化,重金属浸出量减少.
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