Characteristics of Hg0 oxidation by K2S2O8 based on limestone-gypsum desulfurization slurry

被引：0
|
作者：
Tian L. [1 ]
Liu B. [1 ]
Li J. [1 ]
Shen X. [1 ]
机构：
[1] School of Environment Science & Spatial Informatics, China University of Mining and Technology, Xuzhou
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Coal fired flue gas; Desulfurization slurry; Limestone-gypsum method; Mercury oxidation;
D O I：
10.11817/j.issn.1672-7207.2019.01.004
中图分类号：
学科分类号：
摘要：
The effects of slurry pH, K2S2O8 concentration, metallic ion concentration, inlet flue gas Hg0 and SO2 mass concentration on Hg0 oxidation were studied based on the modified liquid reactor. The results show that low value of slurry pH is propitious to oxidize Hg0, and the oxidation efficiency can maintain above 83% when the value of pH keeps around 5.0. The oxidation efficiency of Hg0 can be higher than 90% and keeps stable steadily when K2S2O8 concentration reaches 5 mmol/L. The existence of Mn2+, Ag+ or Co2+ can improve the Hg0 oxidation capability while it can acquire the same outcome through increasing the K2S2O8 concentration to 5 mmol/L. With the increase of Fe3+ concentration, the Hg0 oxidation efficiency rises firstly, then becomes steady, but the efficiency rises again when the Fe3+ concentration is higher than 2.0 mmol/L. The existence of Mg2+ does not enhance the Hg0 oxidation but weakens the oxidation capability. Hg0 oxidation efficiency rises firstly and then descends gradually, and the highest efficiency can reach 85.57% with the increase of flue gas SO2 mass concentration. The existence of SO2 can enhance the stabilization of the system about Hg0 oxidation. © 2019, Central South University Press. All right reserved.
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页码：23 / 28
页数：5
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