화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.36, No.7, 1082-1089, July, 2019
DOI10.1007/s11814-019-0274-2  Export Citation
Mechanisms of dry flue-gas desulfurization using natural manganese oxide ores
Yongxiang Chen1, Yunjiao LI1, †, Xinlong Cao1, 2, Jianguo Li1, Sanchuan Tang3, Wanqi Ye1, and Xianzhen Zhang1
  • 1School of Metallurgy and Environment, Central South University, Changsha 410083, P. R. China
  • 2Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd., Xian 710075, P. R. China
  • 3Changsha Research Institutes of Mining and Metallurgy, 966 Lushan South Road, Changsha 410012, P. R. China
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The mechanisms of flue-gas desulfurization using high and low-grade natural manganese oxide ores were comparatively studied. Both manganese oxide ores exhibit good desulfurization capabilities with SO2 content in the effluents less than 30 ppm, but the low-grade ores show the much better desulfurization capability. XRD and SEM/EDS results reveal that the MnO2 absorbs the SO2 to convert to MnSO4. The SO2 give prior to react with the surface MnO2 and the produced MnSO2 enriched on the surface leads to the gradually decrease of the SO2 removal rate during desulfurization process. The better desulfurization capability of the low-grade ores is ascribed to the more dispersive MnO2 due to the poriferous/lax internal tunnel structure, and the embedded inert SiO2 shows better support effects to avoid pore structure blocking, which is favorable for enhancing the diffusion of the SO2 and desulfurization reaction process. This study is of significance in the comprehensive utilization of the low-grade natural manganese oxide ores, environmental protection and even the preparation of the desulfurization catalyst with MnO2.
Keywords:Mechanism;Manganese Oxides;Manganese Sulfate;Flue-gas Desulfurization
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