Investigation on mercury removal method from flue gas in the presence of sulfur dioxide.
Investigation on mercury removal method from flue gas in the presence of sulfur dioxide.
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DOI：
10.1016/j.jhazmat.2014.07.012
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发表时间：
2014-08
影响因子：
13.6
通讯作者：
Yongpeng Ma;Zan Qu;Haomiao Xu;Wen-hua Wang;N. Yan
中科院分区：
文献类型：
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作者：
Yongpeng Ma;Zan Qu;Haomiao Xu;Wen-hua Wang;N. Yan
开发了一种新的综合工艺，用于在SO2存在的情况下从烟气中去除和回收汞，SO2通常来自有色金属冶炼。新工艺包括一个预脱硫装置（第一阶段）和一个共吸收装置（第二阶段）。在第一阶段，90%的SO2可以有效地吸收从烟气中的硫酸铁和再生硫酸。同时，烟气中Hg 2+和Hg 0的比例在这一阶段可以重新分配。第二阶段采用复合吸收液可同时脱除烟气中95%以上的Hg 0和残留的SO2，比传统方法回收Hg 0的效率高得多。第二阶段由0.1g/LHgSO_4、1.0%H_2 O_2和H_2SO_4组成的复合吸收液能有效地去除和回收Hg 0，克服了SO_2对Hg 0吸收的负面影响。此外，HgSO 4和H2 O2的浓度随烟气中Hg 0和SO2浓度的变化而变化。该技术是一种很有潜力的烟气脱汞回收技术。
A new integrated process was developed for the removal and reclamation of mercury from the flue gas in the presence of SO2, typically derived from nonferrous metal smelting. The new process contains a pre-desulfurization unit (Stage I) and a co-absorption unit (Stage II). In Stage I, 90% of the SO2from flue gas can be efficiently absorbed by ferric sulfate and reclaimed sulfuric acid. Meanwhile, the proportion of Hg2+and Hg0in the flue gas can be redistributed in this stage. Then, over 95% of the Hg0and the residual SO2can be removed simultaneously with a composite absorption solution from the flue gas in Stage II, which is much more efficient for the Hg0reclaiming than the traditional method. The composite absorption solution in Stage II, which is composed of 0.1 g/L HgSO4, 1.0% H2O2and H2SO4, could effectively remove and reclaim Hg0overcoming the negative effect of SO2on Hg0absorption. Moreover, the concentrations of HgSO4and H2O2were adjusted with the changes in of the concentrations of Hg0and SO2in the flue gas. It is a potential and promising technology for the mercury removal and reclaim from the flue gas in the presence of SO2.