【摘要】 应用能谱分析、灰熔点炉、XRD、压汞仪等仪器手段对国内外8种垃圾焚烧飞灰的成分、熔点、晶相结构、颗粒特性等物理化学性质进行了系统研究。研究表明,飞灰成分因为受原料、炉型、取样位置等因素影响而差异很大。由于飞灰的成分差异导致垃圾焚烧飞灰比煤灰更易于熔融,对熔融处理有利,这主要归因于飞灰中SiO2含量以及SiO2 Al2O3差异,熔点与SiO2含量存在正比关系;添加CaO实现助熔是有条件的,不同飞灰由于焚烧条件和飞灰成分不同导致晶相组成有一定差异;飞灰内部孔径主要分布于0.3μm～1.5μm范围内,飞灰的比表面积为20.5m2 g。更多还原

【Abstract】 Fly ash resulted from municipal solid waste incinerator（MSWI）contains high levels of leachable heavy metals and high TEQ dioxins, and is usually classified as a hazardous waste. Thus further detoxification and stabilization treatment are necessary to MSWI fly ash before disposal. The physical and chemical characteristics of MSWI fly ash have an important influence on treatment. Eight types of MSWI fly ashes were collected from several incinerators in China and France. The composition, melting point, crystal characteristic and pore characteristic of fly ash samples were analyzed in details. The results show that the composition is affected significantly by raw material, type of furnace and the position of sampling et al. The melting point of MSWI fly ash is lower than that of coal-waste, because of different content of SiO₂. The main crystalline phase for each fly ash is different. The range of inner aperture of fly ash is mainly in the size 0.3?μm～1.5?μm, and the specific surface area is about 20.5?m²/g.更多还原