CIESC Journal ›› 2018, Vol. 69 ›› Issue (5): 2233-2241.doi: 10.11949/j.issn.0438-1157.20180048

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Simulation and experimental study on smelter off-gas desulfurization using calcium-based desulfurizer

CHANG Jing1, HU Xiude2, TIAN Hongjing3, YUAN Fuqi1, XU Jingwen3, GUO Qingjie2,3   

  1. 1. College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, Shandong, China;
    2. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China;
    3. College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, China
  • Received:2018-01-15 Revised:2018-01-23
  • Supported by:

    supported by the National Natural Science Foundation of China(51608291, 51106077), the Natural Science Foundation of Shandong Province(ZR2017QB019), the Qingdao Independent Innovation Plan (16-5-1-30-jch), the Ningxia Introduction Innovation Team Plan, and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2017-K19).


A method was developed to recover elemental sulfur from smelter off-gas with high SO2 content. Based on thermodynamic simulation of reactions between some sulfides and SO2, calcium sulfide (CaS) was demonstrated to be a novel chemical desulfurizer. SO2 was reduced to elemental sulfur by reacting with CaS in temperature range from 400℃ to 650℃ and direct solid product was CaSO4 rather than CaO. The experimental desulfurization in a fixed bed reactor showed that reaction temperature had a strong effect on SO2 removal efficiency and sulfur recovery ratio. When temperature was increased within the range of 400℃ and 650℃, both SO2 removal efficiency and sulfur recovery ratio were raised gradually. When temperature was higher than 600℃, SO2 removal efficiency was approximately equal to sulfur recovery ratio. Increasing gas velocity reduced SO2 removal efficiency, sulfur recovery ratio, and difference between these two. SO2 removal efficiency remained at 99.8% at SO2 concentration below 1% but dropped sharply to 92.1% at SO2 concentration up to 3.45%. Average SO2 removal efficiency declined gradually when SO2 concentration was continuously increased. With increase of SO2 concentration, sulfur recovery ratio exhibited an optimal range. At late stage of desulfurization, large particle size of CaS decreased SO2 removal efficiency. SEM photos showed that desulfurizer particles agglomerated more obviously at increase of reaction temperature. XRD patterns verified sublimated elemental sulfur particles in the reduction of SO2 by CaS.

Key words: flue gas, recovery, reduction, SO2 removal efficiency

CLC Number: 

  • X701.7

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