通过自制鼓泡反应器和XRD等手段研究赤泥处理低浓度SO2的脱硫效果及其脱硫机理.试验结果表明,当赤泥浆液固液比为1∶20,赤泥浆液在排放标准内能容硫362.7 mg/g,且赤泥浆液能够在酸性条件下净化SO2,其浆液pH值能降至1.58左右.浆液脱硫过程中固相物质发挥了更大脱硫作用,并提出赤泥分阶段脱硫机理:碱性物质脱硫阶段和铁离子催化氧化脱硫阶段.试验还证明了在赤泥浆液pH≤4时,浆液中铁离子的溶出促进SO2的吸收,且这种促进作用为催化氧化作用.SO2与赤泥反应的最终产物主要为硫酸钙和斜钠明矾.
The desulfurization effect and mechanism of treatment of low concentration SO2 by red mud slurry were studied by means of a laboratory-scale bubbling reactor, XRD and so on.The results show that the red mud liquid can contain sulfur 362.7 mg/g within the National Discharge Standard when the solid-liquid ratio is 1∶20.and red mud can purify SO2 under acidic conditions with the red mud pH of reaction termination dropping to 1.58.The solid matter in slurry desulfurization process has played a greater role in desulfurization the desulfurization,and the mechanism of red mud could be divided into basic physical desulfurization phase and iron ion catalytic oxidation desulfurization phase.When the red mud for pH ≤4, the dissolution of iron ion by mud slurry in acidic conditions has promote the absorption of SO2, and the effect of promoting is catalytic oxidation.Meanwhile, the final product by the reaction of SO2 and red mud mainly is calcium sulfate and sodium alum.
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