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Waste Disposal & Sustainable Energy
Waste Disposal & Sustainable Energy  2019, Vol. 1 Issue (4): 251-259    DOI: 10.1007/s42768-019-00029-5
    
熔融-水热法固化生活垃圾流化床焚烧飞灰中重金属的研究
Qian Chen1, Guojun Lv1, Xuguang Jiang1, Xiaoli Zhao2, Litan Kong2
1 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China  2 Power China Hebei Electric Power Engineering Co., Ltd., Shijiazhaung, China
Stabilization of heavy metals in municipal solid waste circulating fluidized bed incineration fly ash by fusion–hydrothermal method
Qian Chen1, Guojun Lv1, Xuguang Jiang1, Xiaoli Zhao2, Litan Kong2
1 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China  2 Power China Hebei Electric Power Engineering Co., Ltd., Shijiazhaung, China
 全文: PDF 
摘要： 城市生活垃圾循环流化床焚烧（MSWCFBI）飞灰是一种危险废物，对其处置提出了挑战。一种有效的方法是原位稳定粉煤灰结构中的有毒重金属离子。本文提出了一种熔融-水热法处理三种MSWCFBI粉煤灰样品，包括氮气气氛下的熔融预处理和微波辅助水热处理。其中，特别进行了浸出试验以证明重金属的稳定性。通过熔融-水热处理，粉煤灰中Cd、Cu、Zn、Pb、Ni、Cr离子的浸出浓度明显低于未处理的粉煤灰和仅通过水热处理的样品。同时减少了从粉煤灰中迁移到水热残余液中的重金属离子。重要的是，在熔融-水热过程中形成了大量的沸石，如百脉石和方钠石。熔融预处理显著促进了石英向非晶硅和硅酸盐的转化，加速了硅的溶解，促进了沸石的形成。最终，重金属离子会被困在沸石骨架中，从而增强了重金属的稳定性。此外，三种处理后的粉煤灰的阳离子交换容量值分别为1.099、1.168和1.188meq g-1，比仅通过水热处理处理的样品大两倍。综上所述，熔融-水热法有助于稳定粉煤灰中的重金属离子，并且所获得的高沸石含量固体产物具有广阔的应用前景。
关键词： 重金属;  MSWCFBI粉煤灰;  熔融;  水热;  沸石    
Abstract: Municipal solid waste circulating fluidized bed incineration (MSWCFBI) fly ash was a hazardous waste, maintaining challenges for disposal. One effective approach was stabilizing the toxic heavy metal ions in the fly ash structures in situ. This work proposed a fusion–hydrothermal method, including fusion pretreatment in nitrogen atmosphere and microwave-assisted hydrothermal process, to treat three MSWCFBI fly ash samples. Specifically, leaching tests were performed to demonstrate the heavy metal stabilization. Through the treatment of the fusion–hydrothermal process, the concentrations of Cd, Cu, Zn, Pb, Ni, and Cr ions leaching from the fly ashes were obviously less than those of the raw fly ash and the sample only treated by hydrothermal process. Meanwhile, the heavy metal ions migrating from the fly ash to the hydrothermal residual liquid were reduced. Importantly, lots of zeolites formed during the fusion–hydrothermal process, such as to bermorite and sodalite. The fusion pretreatment significantly facilitated the conversion of quartz into amorphous silicon and silicate salts. Then, the silicon dissolution was accelerated and zeolite formation was promoted. Eventually, the heavy metal ions could be trapped in zeolite frameworks, enhancing the stabilization of heavy metal. Moreover, the cation-exchange capability values of the three treated fly ash were 1.099, 1.168, and 1.188 meq g-1, two-folder larger than those of the samples only treated by hydrothermal process. In summary, the fusion–hydrothermal method could facilitate the stabilization of heavy metal ions in the fly ash and the as-obtained solid product with high content of zeolite was promising for future applications.
Key words: Heavy metal    MSWCFBI fy ash    Fusion    Hydrothermal    Zeolite
收稿日期: 2019-10-21 出版日期: 2020-01-19
通讯作者: Xuguang Jiang     E-mail: jiangxg@zju.edu.cn
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引用本文:

Qian Chen, Guojun Lv, Xuguang Jiang, Xiaoli Zhao, Litan Kong. Stabilization of heavy metals in municipal solid waste circulating fluidized bed incineration fly ash by fusion–hydrothermal method. Waste Disposal & Sustainable Energy, 2019, 1(4): 251-259.

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http://www.zjujournals.com/wdse/CN/10.1007/s42768-019-00029-5    或    http://www.zjujournals.com/wdse/CN/Y2019/V1/I4/251

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