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Removal of SO2 from flue gas using Bayer red mud: Influence factors and mechanism

拜尔法赤泥用于烟气脱硫:影响因素与机理

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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%.

摘要

本文研究了由拜尔法赤泥与水制备吸收剂并应用于烟气脱硫。研究了固液比、吸收温度、入口 SO2 浓度、O2 含量、SO42-和拜尔赤泥中其他组分对烟气脱硫的影响,建立了烟气脱硫的机制。结果表 明这些因素中固液比是最主要的因素,随后是入口SO2 浓度,温度的影响最小。当气体流量为1.5 L/min 时,最佳的反应条件为:液固比20:1,吸收温度25 °C,入口SO2 浓度1000 mg/m3。当O2 含量高于 7%后,O2 含量对脱硫效率的影响较小。SO42-的累积抑制了脱硫效率。碱液吸收、液相催化氧化共占 据脱硫进程中总贡献的98.61%。

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Authors and Affiliations

  1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China

    Lei Tao  (陶雷), Heng Wu  (吴恒), Jie Wang  (王婕), Bin Li  (李彬) & Xue-qian Wang  (王学谦)

  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

    Ping Ning  (宁平)

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  1. Lei Tao  (陶雷)
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Correspondence to Bin Li  (李彬).

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Foundation item: Project(2017YFC0210500) supported by the National Key Technology R&D Program of China; Project(2017ACA092) supported by the Major Projects of Technical Innovation in Hubei Province, China

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Tao, L., Wu, H., Wang, J. et al. Removal of SO2 from flue gas using Bayer red mud: Influence factors and mechanism. J. Cent. South Univ. 26, 467–478 (2019). https://doi.org/10.1007/s11771-019-4019-5

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