飞灰基地聚合物固化体的抗海水侵蚀性能

Seawater Erosion Resistance of Geopolymer Solidification MSWI Fly Ash

为了探讨城市垃圾焚烧(MSWI)飞灰基地聚合物固化体的抗海水侵蚀性能,通过飞灰基地聚合物固化体的质量、抗压强度和重金属浸出浓度变化分析海水的侵蚀影响。结果表明:飞灰基地聚合物固化体具有良好的抗海水侵蚀性能:浸泡240 d后,质量损失率小于20.5%;抗压强度达到42.36 MPa;重金属Cr、Cu、Zn、Cd、Hg、Pb浸出浓度分别仅为32.84、21.27、8.36、0.07、0.17和1.75μg/L,下降率达到了90.0%、73.7%、77.9%、86.48%、85.0%和94.3%。通过X射线衍射(XRD)、傅立叶红外光谱(FTIR)、热重-差重(TG-DTA)和电镜扫描(SEM)等分析方法对MSWI飞灰基地聚合物固化体微观结构进行表征,结果显示飞灰基地聚合物在海水侵蚀下结构没有被破坏。

In order to discuss the resistance to seawater erosion with geopolymer solidification MSWI fly ash, the research analyzed the influence of seawater erosion by studying the change of mass, compressive strength and leaching concentration. The results showed that geopolymer had a high resistance to seawater erosion: after 240 days, weight loss changed within 2.5% and the compressive strength reached 42.36 MPa. The leaching concentration of Cr, Cu, Zn, Cd, Hg, and Pb were 32.84, 21.27, 8.36, 0.07, 0.17 and 1.75 μg/L, respectively. The scales of decrease were 90.0%, 73.7%, 77.9%, 86.48%, 85.0% and 94.3%, respectively. XRD(X-ray diffraction), FTIR(Fourier transform infrared spectroscopy), TG-DTA(thermal gravity and differential thermal analysis) and SEM(scanning electron microscope) studies were carried out to identify microstructure of the geopolymer. The results showed that the structure of the geopolymer was not damaged by seawater.