A novel method for salts removal from municipal solid waste incineration fly ash through the molten salt thermal treatment

被引：44
作者：
Xie, Kang [1 ]
Hu, Hongyun [1 ]
Cao, Jinxiu [1 ]
Yang, Fu [1 ]
Liu, Huan [1 ,2 ]
Li, Aijun [1 ,2 ]
Yao, Hong [1 ,2 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Dept New Energy Sci & Engn, Wuhan 430074, Peoples R China
来源：
CHEMOSPHERE | 2020年 / 241卷
基金：
中国国家自然科学基金;
关键词：
Municipal solid waste incineration fly ash; Molten salt thermal treatment; Salts removal; Carbonates; Chlorides; HEAVY-METALS; POLLUTION-CONTROL; MSW INCINERATION;
D O I：
10.1016/j.chemosphere.2019.125107
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The disposal of the hazardous municipal solid waste (MSW) incineration fly ash is a critical environmental issue in China and the high contents of salts in the fly ash make the ash disposal extremely difficult. The present study proposes a novel method for the salts removal from MSW incineration fly ash using molten carbonates and chlorides at moderate temperatures from 773 K to 1073 K. The results showed that molten salts could effectively extract alkali and alkaline earth metals chlorides and sulfates from the fly ash. Other ash components, like Si/Al-compounds, were precipitated from the molten salts and concentrated in residues. By comparison, molten carbonates showed greater capability in the salts extraction while molten chlorides showed better selectivity in chlorides removal from MSW incineration fly ash. These findings suggest that the optimization of molten salts system could further prove the potential applicability of molten salts thermal treatment method for the salts removal from MSW incineration fly ash. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：4
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