Wang Ying, Ni Wen, Suraneni Prannoy
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, FL 33146, USA.
Materials (Basel). 2019 Mar 20;12(6):925. doi: 10.3390/ma12060925.
Municipal solid waste incineration fly ash (MSWIFA) is a hazardous by-product of waste incineration. The objective of this research is to encapsulate the chloride in MSWIFA and to develop a utilizable construction material using MSWIFA, ground granulated blast-furnace slag (GGBFS), ladle furnace slag (LFS), and gypsum. A secondary objective of the work is to explain the hydration and encapsulation mechanisms in this material system using isothermal calorimetry (IC), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and ion chromatography (IC). The predominant hydration products are ettringite, Friedel's salt, and C-S-H gel, with Friedel's salt and C-S-H dominating in systems high in LFS and ettringite and C-S-H gel dominating in systems low in LFS. The chloride encapsulation showed a strong correlation with the Friedel's salt amount; however, some encapsulation was also likely due to physical binding in the C-S-H gel. In a system with 30% MSWIFA (by mass), the optimal amount of LFS for strength and chloride encapsulation is 20%⁻40% (by mass).
城市固体废弃物焚烧飞灰（MSWIFA）是垃圾焚烧产生的一种有害副产品。本研究的目的是将MSWIFA中的氯化物进行包裹，并利用MSWIFA、磨细粒化高炉矿渣（GGBFS）、钢包精炼炉炉渣（LFS）和石膏开发一种可利用的建筑材料。这项工作的第二个目标是使用等温量热法（IC）、X射线衍射（XRD）、热重分析（TGA）、扫描电子显微镜（SEM）和离子色谱法（IC）来解释该材料体系中的水化和包裹机理。主要的水化产物是钙矾石、弗里德尔盐和C-S-H凝胶，在LFS含量高的体系中弗里德尔盐和C-S-H占主导，而在LFS含量低的体系中钙矾石和C-S-H凝胶占主导。氯化物的包裹与弗里德尔盐的含量有很强的相关性；然而，一些包裹也可能是由于在C-S-H凝胶中的物理结合。在含有30%（质量）MSWIFA的体系中，对于强度和氯化物包裹而言，LFS的最佳用量为20%⁻40%（质量）。
