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

doi:10.1016/j.cjche.2019.09.006

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 Sun^1,2, Guangzhi Xin¹, Lu Yao^1,2, Lin Yang^1,2, Xia Jiang^1,2, Wenju Jiang^1,2

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 Sun^1,2, Guangzhi Xin¹, Lu Yao^1,2, Lin Yang^1,2, Xia Jiang^1,2, Wenju Jiang^1,2

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/Abstract

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

Dong Sun, Guangzhi Xin, Lu Yao, Lin Yang, Xia Jiang, Wenju Jiang. Manganese leaching in high concentration flue gas desulfurization process with semi-oxidized manganese ore[J]. 中国化学工程学报, 2020, 28(2): 571-578.

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

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

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