SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (2): 571-578.DOI: 10.1016/j.cjche.2019.09.006

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Manganese leaching in high concentration flue gas desulfurization process with semi-oxidized manganese ore

Dong Sun1,2, Guangzhi Xin1, Lu Yao1,2, Lin Yang1,2, Xia Jiang1,2, Wenju Jiang1,2   

  1. 1 College of Architecture and Environment, Sichuan University, Chengdu 610065, China;
    2 National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, China
  • 收稿日期:2019-04-19 修回日期:2019-06-21 出版日期:2020-02-28 发布日期:2020-05-21
  • 通讯作者: Wenju Jiang
  • 基金资助:
    We would like to acknowledge the funding support by National Key Research and Development Program of China (No. 2018YFC0213405).

Manganese leaching in high concentration flue gas desulfurization process with semi-oxidized manganese ore

Dong Sun1,2, Guangzhi Xin1, Lu Yao1,2, Lin Yang1,2, Xia Jiang1,2, Wenju Jiang1,2   

  1. 1 College of Architecture and Environment, Sichuan University, Chengdu 610065, China;
    2 National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, China
  • Received:2019-04-19 Revised:2019-06-21 Online:2020-02-28 Published:2020-05-21
  • Contact: Wenju Jiang
  • Supported by:
    We would like to acknowledge the funding support by National Key Research and Development Program of China (No. 2018YFC0213405).

摘要: Manganese leaching during high concentration flue gas desulfurization process with semi-oxidized manganese ore was studied in this paper. It was found that there were different reaction pathways among which MnO2, Mn2O3 and MnCO3 in semi-oxidized manganese ore during flue gas desulphurization and manganese leaching. High SO2 concentration facilitated redox reaction between MnO2 and SO2, and high concentration of H2SO4 accelerated MnCO3/Mn2O3 leaching from semi-oxidized ore. Kinetics study showed that manganese leaching in flue gas desulfurization process with semi-oxidized ore was controlled by a mixed-control model, that is the surface chemical reaction and mass diffusion dominated both the oxidation of SO2 and manganese leaching process. The apparent activation energy was 13.05 kJ·mol-1 and the reaction orders with respect to SO2 and H2SO4 concentration were 1.38 and 0.10, respectively. Finally, a semi-empirical rate equation based on shrinking core model was derived to describe the process.

关键词: Semi-oxidized manganese ore, Flue gas desulfurization, Manganese leaching, Kinetics study

Abstract: Manganese leaching during high concentration flue gas desulfurization process with semi-oxidized manganese ore was studied in this paper. It was found that there were different reaction pathways among which MnO2, Mn2O3 and MnCO3 in semi-oxidized manganese ore during flue gas desulphurization and manganese leaching. High SO2 concentration facilitated redox reaction between MnO2 and SO2, and high concentration of H2SO4 accelerated MnCO3/Mn2O3 leaching from semi-oxidized ore. Kinetics study showed that manganese leaching in flue gas desulfurization process with semi-oxidized ore was controlled by a mixed-control model, that is the surface chemical reaction and mass diffusion dominated both the oxidation of SO2 and manganese leaching process. The apparent activation energy was 13.05 kJ·mol-1 and the reaction orders with respect to SO2 and H2SO4 concentration were 1.38 and 0.10, respectively. Finally, a semi-empirical rate equation based on shrinking core model was derived to describe the process.

Key words: Semi-oxidized manganese ore, Flue gas desulfurization, Manganese leaching, Kinetics study