NDLI: Removal of mercury from flue gas from nonferrous metal smelting, by use of mercury chloride solution, and mechanisms of inhibition by sulfur dioxide

Content Provider	Springer Nature Link
Author	Ma, Yongpeng Xu, Haomiao Qu, Zan Yan, Naiqiang Wang, Wenhua
Copyright Year	2014
Abstract	Elemental mercury (Hg$^{0}$) in flue gas can be efficiently captured by use of mercury chloride (HgCl$_{2}$) solution. However, the ability of HgCl$_{2}$ to absorb Hg$^{0}$ is severely reduced by high concentrations of sulfur dioxide (SO$_{2}$) in the flue gas. Methods used to remove Hg$^{0}$ by absorption in HgCl$_{2}$ solution, and mechanisms by which these methods are inhibited by SO$_{2}$, were studied in this work. Reduction of HgCl$_{2}$ and absorption of Hg$^{0}$ both occurred in HgCl$_{2}$ solution in the presence of SO$_{2}$. The reduced efficiency of Hg$^{0}$ removal was attributed to reduction of HgCl$_{2}$ to Hg$^{0}$ by SO$_{3}$ $^{2−}$ or HSO$_{3}$ $^{−}$, formed from SO$_{2}$. Moderate concentrations of Cl$^{−}$ and H$_{2}$O$_{2}$ had synergistic effects with low pH on Hg$^{0}$ removal by HgCl$_{2}$ solution. A new composite absorption solution containing 7.36 mmol/L HgCl$_{2}$ and 73.6 mmol/L Cl$^{−}$ at pH 0 was suitable for treatment of flue gas containing high concentrations of both Hg$^{0}$ and SO$_{2}$, the latter of which is reclaimed by production of sulfuric acid after Hg$^{0}$ removal. Another new composite absorption solution containing 7.36 mmol/L HgCl$_{2}$ and 1.0 % H$_{2}$O$_{2}$ at pH 0 was suitable for treatment of flue gas containing high concentrations of Hg$^{0}$ and lower concentrations of SO$_{2}$, the latter of which is co-absorbed in the Hg$^{0}$ removal unit.
Starting Page	5889
Ending Page	5905
Page Count	17
File Format	PDF
ISSN	09226168
Journal	Research on Chemical Intermediates
Volume Number	41
Issue Number	8
e-ISSN	15685675
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-06-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nonferrous metal smelting Flue gas Mercury chloride Sulfur dioxide Mercury removal Catalysis Physical Chemistry Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry

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