Mineralogical characterization of municipal solid waste incineration bottom ash with an emphasis on heavy metal-bearing phases.
Mineralogical characterization of municipal solid waste incineration bottom ash with an emphasis on heavy metal-bearing phases.
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DOI：
10.1016/j.jhazmat.2011.01.070
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发表时间：
2011-03
影响因子：
13.6
通讯作者：
Yunmei Wei;T. Shimaoka;Amirhomayoun Saffarzadeh;F. Takahashi
中科院分区：
文献类型：
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作者：
Yunmei Wei;T. Shimaoka;Amirhomayoun Saffarzadeh;F. Takahashi
城市垃圾焚烧底灰中含有大量的重金属.这些重金属在底灰中的存在和不均匀分布可以增加这些残留物在填埋或回收时的长期行为方面的复杂性。本文对日本三座炉排式焚烧炉底灰进行了分析。这项研究提供了详细的信息，底灰成分的矿物学特征和这些成分的风化行为，通过光学显微镜和扫描电子显微镜。结果表明，底灰主要由各种硅酸盐基玻璃相（灰分的48-54wt%）和矿物相，包括黄长石，假硅灰石，尖晶石和金属夹杂物（Fe-P，Fe-S，Fe-Cu，Cu-Sn，Cu-Zn，Cu-S和Cu-Pb为主的相），作为在焚烧过程中形成的熔融产物。嵌在玻璃基质中的化合物，如尖晶石和金属夹杂物，在重金属（Pb，Zn，Cu，Cr，Mn，Ni等）的富集中起着最重要的作用。其他相，如耐火矿物和陶瓷，经常发现在灰，是不太重要的影响，其参与的重金属。实验室规模的人工风化和10年的填埋底灰样品的分析表明，次生矿化/蚀变的底灰成分，主要是碳酸化和玻璃演变大大降低了潜在的风险，重金属对周围环境。
Municipal solid waste incineration (MSWI) bottom ash contains a considerable amount of heavy metals. The occurrence and uneven distribution of these heavy metals in bottom ash can increase the complexity of such residues in terms of long-term behavior upon landfilling or recycling. Bottom ashes sampled from three stoker-type incinerators in Japan were analyzed in this paper. This study presents detailed information on the mineralogical characterization of bottom ash constituents and the weathering behavior of these constituents by means of optical microscopy and scanning electron microscopy. It was revealed that bottom ash mainly consists of assorted silicate-based glass phases (48–54wt% of ash) and mineral phases including melilites, pseudowollastonite, spinels, and metallic inclusions (Fe–P, Fe–S, Fe–Cu, Cu–Sn, Cu–Zn, Cu–S, and Cu–Pb dominated phases), as melt products formed during the incineration process. The compounds embedded in the glass matrix, e.g. spinels and metallic inclusions, played the most important role in concentration of heavy metals (Pb, Zn, Cu, Cr, Mn, Ni, etc.). Other phases such as refractory minerals and ceramics, frequently found in ash, were of less significance in terms of their influence on the involvement of heavy metals. Analysis of lab-scale artificially weathered and 10-year landfilled bottom ash samples revealed that secondary mineralization/alteration of the bottom ash constituents principally carbonation and glass evolution substantially decreased the potential risk of the heavy metals to the surrounding environment.