Experimental simulation on the electrochemical mechanism of iron pollution from “dual-source” in closed coal mine water

ZHOU Lai; YE Tao; ZHENG Shuangshuang; ZHU Xueqiang; WU Jiangfeng

doi:10.13199/j.cnki.cst.2023-0150

Volume 52 Issue 3

Mar. 2024

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COAL SCIENCE AND TECHNOLOGY > 2024 > 52(3): 323-331. > DOI: 10.13199/j.cnki.cst.2023-0150

ZHOU Lai，YE Tao，ZHENG Shuangshuang，et al. Experimental simulation on the electrochemical mechanism of iron pollution from “dual-source” in closed coal mine water[J]. Coal Science and Technology，2024，52（3）：323−331

. DOI: 10.13199/j.cnki.cst.2023-0150

Citation:

. DOI: 10.13199/j.cnki.cst.2023-0150

Citation:

. DOI: 10.13199/j.cnki.cst.2023-0150

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Experimental simulation on the electrochemical mechanism of iron pollution from “dual-source” in closed coal mine water

ZHOU Lai^{1, 2,},
YE Tao^{1, 2},
ZHENG Shuangshuang^{1, 2},
ZHU Xueqiang^{1, 2},
WU Jiangfeng³

1.
Collaborative Innovation Center for Resource Utilization and Ecological Restoration of Old Industrial Base, Xuzhou 221116, China
2.
School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
3.
Xuzhou Coal Mining Group, Xuzhou 221000, China

Funds:

National Key Research and Development Program of China (2022YFC3702203); National Natural Science Foundation of China (41572218); Major Project Cultivation Funding Project of China University of Mining and Technology (2020ZDPYMS07)

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Received Date: February 03, 2023
Available Online: November 07, 2023

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Abstract

Abstract

The closed coal mine water is mostly characterized by high iron. After mine closure and flooding, residual iron-prone devices and iron-bearing minerals form a “dual-source” iron pollution system in mine water, contributing to the release of iron in different periods after mine closure and creating environmental risks in groundwater. In order to clarify the process and reaction mechanism of “dual-source” iron release in closed coal mine water, to characterize the “dual-source” release mode of iron pollution, and compare the release rate, based on the principle of electrochemical simulation, the working electrodes were prepared by using pyrite and mining bolt as the simulated “dual-source”, and the redox reaction process and iron release mechanism in the acid mine water under the coexistence of “dual-source” at the early stage of coal mine closure were simulated using electrochemical methods such as cyclic voltammetry and polarization as well as X-ray photoelectron spectroscopy (XPS) material surface characterization techniques. The results showed that the dissolved oxygen content was an important inhibitory factor affecting the redox reaction of pyrite and bolt in acid mine drainage. The oxidation mechanism of pyrite and bolt is different, the passivation effect occurs on the surface of pyrite during oxidation, and the final oxidation products of both materials are Fe³⁺ and ${ {\rm{SO}}_{4}^{2-}}$ . Pyrite releases iron mainly through the oxidation reaction of Fe²⁺ on the mineral surface. Bolt released iron mainly through the reaction of iron and its oxidation products on the surface of the material with the acid substances in the solution, and the oxide reacted preferentially over the monomer. In the simulated aerobic (DO=7.0 mg/L) acid mine drainage, the annual corrosion rates of pyrite and bolt reached8.3636mm/a and7.8314mm/a, respectively, and the annual iron release rates reached1.2240g/a and3.9395g/a, respectively. In the simulated underground anoxic (DO=3.5 mg/L) acid mine drainage, the annual corrosion rates of pyrite and bolt reached0.7324mm/a and0.3642mm/a, respectively, and the estimated annual iron release rates reached0.1072g/a and0.1832g/a, respectively. The integrated electrochemical parameters and static iron release experiments showed that the total iron release rate ratios were both dual-source > bolt > pyrite under the conditions of sufficient or lack of dissolved oxygen.
- closed coal mine,
- acid mine drainage,
- dual-source release,
- iron pollution,
- electrochemical mechanism

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References

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Experimental simulation on the electrochemical mechanism of iron pollution from “dual-source” in closed coal mine water

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