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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Removal of SO2 from flue gas using Bayer red mud:Influence factors and mechanism
TAO Lei(陶雷)1, WU Heng(吴恒)1, WANG Jie(王婕)1, LI Bin(李彬)1, WANG Xue-qian(王学谦)1, NING Ping(宁平)2

1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2. National and Local Joint Engineering Research Center for Waste Gas Resource Utilization in Metallurgy and Chemical Industry, Kunming University of Science and Technology, Kunming 650500, China

Abstract:The absorbent composing of Bayer red mud and water was prepared and applied to removing SO2 from flue gas. Effects of the ratio of liquid to solid (L/S), the absorption temperature, the inlet SO2 concentration, the O2 concentration, SO42- and other different components of Bayer red mud on desulfurization were conducted. The mechanism of flue gas desulfurization was also established. The results indicated that L/S was the prominent factor, followed by the inlet SO2 concentration and the temperature was the least among them. The optimum condition was as follows: L/S, the temperature and the SO2 concentration were 20:1, 25 °C and 1000 mg/m3, respectively, under the gas flow of 1.5 L/min. The desulfurization efficiency was not significantly influenced when O2 concentration was above 7%. The accumulation of SO42- inhibited the desulfurization efficiency. The alkali absorption and metal ions liquid catalytic oxidation were involved in the process, which accounted for 98.61%.

 

Key words: Bayer red mud; flue gas desulfurization; wet catalytic oxidation; iron catalysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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