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Low-carbon utilization of coal gangue under the carbon neutralization strategy: a short review

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Abstract

The treatment and utilization of coal gangue, one of the main solid wastes produced during coal mining, are of great significance in environmental protection and resource development. In the contemporary context of the carbon neutralization strategy, due to the property of the carbon in coal gangue, it is necessary to be cautious of the carbon effect during its treatment and utilization process. To grasp the concept of the carbon effect of coal gangue more comprehensively and systematically and provide more economic and reasonable technical strategies for the treatment and utilization of coal gangue against the background of carbon neutralization, this study systematically summarizes the research results from three aspects: the carbon emission risk of coal gangue itself, the carbon emission risk during its treatment and utilization process, and the potential effect of the application carbon sequestration. There are many types of carbon emission risks when considering coal gangue itself, such as direct carbon emissions resulting from spontaneous combustion and extended carbon emissions due to its negative pollution impacts on soil and vegetation. At present, the main utilization modes of coal gangue include fuel, building materials, filling materials, and ecological materials. Most of them have certain carbon emission risks, while some of them also have certain carbon fixation effects. Against the background of the carbon neutralization strategy, the treatment and utilization of coal gangue should focus on three aspects: its own carbon-free emissions; its carbon absorption effect and low-carbon emission in the treatment process; and taking comprehensive technical measures, such as the oxidation inhibition of coal gangue, enhancement of the ecological carbon sink function, excavation of the carbon absorption function, and nearby utilization and pollution prevention and control, to achieve high value and low-carbon release in the treatment and utilization of coal gangue.

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Acknowledgements

I would like to send my gratitude for the support from the Science and Technology Innovation and venture Fund of China Coal Technology & Engineering Group (Grant No. 2020-2-CXY001, 2019-ZD004, 2019-2-ZD005) and the Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education (Open Fund Project No. MJST 2022-03). I am grateful for the valuable comments of the editors and the three anonymous reviewers, which help to improve the manuscript greatly.

Funding

China Coal Technology Engineering Group, 2020-2-CXY001, 2019-ZD004, 2019-2-ZD005, Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education, MJST2022-03, Xianghong Liu.

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  1. Chinese Institute of Coal Science, Beijing, 100013, China

    Xianghong Liu

  2. Engineering Research Center of Coal-Based Ecological Carbon Sequestration Technology of the Ministry of Education, Shanxi Datong University, Datong, 037009, China

    Xianghong Liu

  3. CCTEG Beijing Research Institute of Land Renovation and Ecological Restoration Technology Co., Ltd., Beijing, 100013, China

    Xianghong Liu

  4. Research Center of Land Renovation and Ecological Restoration Engineering in the Coal Industry, Beijing, 100013, China

    Xianghong Liu

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Liu, X. Low-carbon utilization of coal gangue under the carbon neutralization strategy: a short review. J Mater Cycles Waste Manag 25, 1978–1987 (2023). https://doi.org/10.1007/s10163-023-01712-w

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