生活垃圾焚烧飞灰的物理化学特性研究

A Study on Physicochemical Characteristics of Fly Ash from MSW Incineration

为进一步研究飞灰在建材中的可利用性。采用XRFCX射线荧光光谱仪），SEM（环境电子扫描电镜）．XRDCX射线衍射仪）、IR（红外光谱仪）、ICP（电感耦合等离子体原子发射光谱仪）．激光粒度分析仪等先进仪器，分析了生活垃圾焚烧飞灰的粒径．微观形貌及组成。结果表明：98％～99％的飞灰颗粒粒径在4～100μm之间，颗粒分布比较均匀；玻璃相含量高达59％，其中的玻璃微珠使得飞灰具有较大的活性；主要化学成分是CaO、SiO2、Al2O3，含量分别35．8％，20．5％、5．8％．构成SiO2-Al2O3-金属氧化物体系；主要矿物成分是SiO2、CaCl2、Ca3Si2O7、Ca2SiO4·0．35H2O、Ca9Si6O21·H2O，K2Al2Si2O8·3．8H2O和AlCl3·4Al（OH）3·4H2O等硅酸盐及铝硅酸盐。指出飞灰是一种有用材料。

Particle size distribution, microstructure and composition of fly ash from municipal solid waste incineration （MSWl） were studied by means of X-ray fluorescence （XRF）, scanning electron microscope （SEM）, X-ray diffraction （XRD）, induced coupled plasma （ICP）, laser particle size analyser, and etc. It was found that the size of 98% - 99% fly ash particles was in the range of 4 to 100 μm. It featured a rather even size distribution and contained vitrics up to 59% in which vitreous micro-beads made the fly ash more active. It mainly comprised 35.8% CaO, 20.5% SiO2 and 5.8% Al2O3 featuring a system of SiO2-AI203-metal oxides. Its major mineral composition was silicates and alumino-silicates containing SiO2, CaCl2, Ca3Si2O7, Ca2SiO4·0.35H2O, Ca9Si6O21· H2O, K2Al2Si2O8·3.8H2O, AlCl3·4Al（OH）3·4H2O and etc. Hence, fly ash was of a usable material.