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Evaluation of Manganese Removal from Acid Mine Drainage by Oxidation and Neutralization Method
산화법과 중화법을 이용한 산성광산배수 내 망간 제거 평가
Econ. Environ. Geol. 2020 Dec;53(6):687-94
Published online December 31, 2020;  https://doi.org/10.9719/EEG.2020.53.6.687
Copyright © 2020 the Korean society of economic and environmental gelology.

Bum-Jun Kim1, Won-Hyun Ji2, and Myoung-Soo Ko1,3*
김범준1 · 지원현2 · 고명수1,3*

1Department of Integrated Energy and Infra System, Graduate School, Kangwon National University, Chuncheon 24341, Republic of Korea
2Institute of Mine Reclamation Technology, Mine Reclamation Corporation (MIRECO), Wonju 26464, Republic of Korea
3Department of Energy and Resources Engineering, Kangwon National University, Chuncheon 24341, Republic of Korea
1강원대학교 에너지·인프라 시스템 융합학과, 2한국광해관리공단 기술연구소, 3강원대학교 에너지자원공학과
Received July 31, 2020; Revised November 20, 2020; Accepted December 2, 2020.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Two oxidizing agents (KMnO4, H2O2), and one neutralizing agent (NaOH) were applied to evaluate Mn removal in mine drainage. A Mn2+ solution and artificial mine drainage were prepared to identify the Fe2+ influence on Mn2+ removal. The initial concentrations of Mn2+ and Fe2+ were 0.1 mM and 1.0 mM, respectively. The injection amount of oxidizing and neutralizing agents were set to ratios of 0.1, 0.67, 1.0, and 2.0 with respect to the Mn2+ mole concentration. KMnO4 exhibited a higher removal efficiency of Mn2+ than did H2O2 and NaOH, where approximately 90% of Mn2+ was removed by KMnO4. A black MnO2 was precipitated that indicated the oxidation of Mn2+ to Mn4+ after an oxidizing agent was added. In addition, MnO2 (pyrolusite) is a stable precipitate under pH-Eh conditions in the solution. However, relatively low removal ratios (6%) of Mn2+ were observed in the artificial mine drainage that included 1.0 mM of Fe2+. The rapid oxidation tendency of Fe2+ as compared to that of Mn2+ was determined to be the main reason for the low removal ratios of Mn2+. The oxidation of Fe2+ showed a decrease of Fe concentration in solution after injection of the oxidizing and neutralizing agents. In addition, Mn7+ of KMnO4 was reduced to Mn2+ by Fe2+ oxidation. Thus, the concentrations of Mn increased in artificial mine drainage. These results revealed that the oxidation method is more effective than the neutralization method for Mn removal in solution. It should also be mentioned that to achieve the Mn removal in mine drainage, Fe2+ removal must be conducted prior to Mn2+ oxidation.
Keywords : mine drainage, manganese, iron, oxidation, neutralization

 

February 2021, 54 (1)