烧结
污染物
化学
甲醛
二苯并呋喃
硫脲
喹啉
环境化学
联苯
铁矿石
核化学
冶金
有机化学
材料科学
作者
Dan Xia,Jiani Xu,Wenpei Li,Yifei Sun
出处
期刊:ACS ES&T engineering
[American Chemical Society]
日期:2022-09-22
卷期号:2 (11): 2095-2103
被引量:2
标识
DOI:10.1021/acsestengg.2c00167
摘要
The iron ore sintering process is a major source of unintentional persistent organic pollutants (UP-POPs). Although challenging, it is important to develop effective and economical methods suitable for practical application to control these highly toxic pollutants. In this study, three novel N/S-based macromolecular compounds, i.e., urea-formaldehyde resin (UFR), thiosemicarbazone-formaldehyde resin (TSCFR), and thiourea-formaldehyde resin (TUFR), were synthesized and investigated for their inhibitory effects on chlorinated benzene (CBz), polychlorinated biphenyl (PCB), and polychlorinated dibenzo-p-dioxin/dibenzofuran (PCDD/F) formation in iron sintering fly ash. TUFR exhibited the highest inhibitory efficiency among the three inhibitors for CBzs (97.6%), PCBs (97.1%), and international toxic equivalent quantity PCDD/Fs (99.9%) with 2.0 wt % addition. Variation of UP-POP homolog profiles indicated that the reaction of N and Cl mainly occurs in the gas phase, while S acts mainly in the solid phase during the inhibition process. The gas–solid phase homolog distribution of UP-POPs indicates that sulfur compounds were the dominant inhibitor and were easily reacted with copper chloride, which was confirmed by density functional theory calculations. TUFR showed 46.9% CBz, 82.9% PCB, and 58.8% PCDD/F reduction efficiencies in a pilot-scale sintering system, indicating that TUFR is an appropriate technique for reducing UP-POP emissions in a full-scale iron ore sintering process.
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