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| Distribution and chemical forms of major elements in MSWI fly ash |
| HOU Xia-li, LI Xiao-dong, CHEN Tong, LU Sheng-yong, JI Sha-sha, REN Yong |
| State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China |
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Abstract Three fly ash samples came from different types of municipal solid waste incineration (MSWI). The major elements in different depth of fly ashes and their leachabilities, especially chemical forms of C and Cl at the outermost layer of fly ash surface, were discussed. Results indicate that Si, Al, Fe, Ti and Ca, with high boiling point, are more easily taken into the core of fly ash particles mechanically in the forms of stable oxides. While elements with low boiling point, such as Na, K, Zn, are mostly adsorbed on the surface of fly ash particles by “evaporation-condensation” process. At the outermost layer of fly ash surface, the C has different species, such as graphitic-C(C=C), aliphatic-C(C-H/C-C) and O-functional groups(C-O/C=O/O-C=O); The Cl consists of both inorganic and organic functionalities, and the proportion of them is 60% and 40%, respectively. For the reasons of low concentration of chlorine and oxidizing atmosphere in circulating fluidized bed (CFB) incinerator, the enrichment of Na and K on the surface of fly ash particles in CFB incinerator is not as high as that in grate incinerator．
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Published: 26 December 2015
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垃圾焚烧飞灰中主要元素的深度分布及形态
以正在运行的3个不同垃圾焚烧炉的布袋除尘器飞灰为研究对象,分析不同炉型飞灰中的主要元素在飞灰颗粒不同深度上的分布状况及浸出特性,并着重对飞灰表面C和Cl的形态进行讨论.结果表明：飞灰的基体主要由Si、Al、Fe、Ca、Mg、Ti等高沸点的元素,通过机械迁移以氧化物的形式形成；而Na、K等低沸点元素,主要通过“蒸发-冷凝”机理以可溶性氯盐和硫酸盐的形式富集在飞灰颗粒表面.在飞灰表面,C元素主要以C=C、C-H/C-C、C-O/C=O/O-C=O等有机态形式出现,Cl元素的有机态和无机态,分别约占40%和60%.流化床飞灰表面Na、K等元素的富集状况没有炉排炉明显,主要是由于流化床炉气氛多呈氧化性并且其中氯含量较低,抑制了金属的挥发.
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