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

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, SO₄^2- 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 SO₄^2- inhibited the desulfurization efficiency. The alkali absorption and metal ions liquid catalytic oxidation were involved in the process, which accounted for 98.61%.

Keywords

Bayer red mud / flue gas desulfurization / wet catalytic oxidation / iron catalysis

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