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<p>Negative carbon treatment of abandoned coal mine goaf under the “carbon peak, carbon neutral” initiative is a pressing research challenge. This study investigates the potential of using alkaline high-water materials to solidify supercritical CO<sub>2</sub> and fill coal mine goafs, offering a novel solution to this issue. Comprehensive experiments, including scanning electron microscopy (SEM), and X-ray diffraction (XRD), were conducted to analyze the reaction mechanisms and mechanical properties of the solidified materials. Results reveal that 1&#xa0;kg of high-water materials can solidify 53.5&#xa0;g of CO<sub>2</sub>, with stable and environmentally benign calcium carbonate (CaCO<sub>3</sub>) as the primary product. The solidified material achieves a maximum tensile strength of 0.45&#xa0;MPa and a compressive strength of 1.29&#xa0;MPa. These values meet the strength requirements for grouting and filling coal mine goafs. This confirms the feasibility of using high-water materials solidified with supercritical CO<sub>2</sub> for filling and treating goaf. The findings provide significant theoretical support for carbon dioxide sequestration in old goaf area.</p> Graphical abstract <p></p>

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Carbon sequestration in coal mine goafs: innovations in high-water material solidification with supercritical carbon dioxide for global carbon neutrality initiatives

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Jianyong Huang,
  • Huaizhan Li,
  • Chao Tang,
  • Guangli Guo,
  • Yafei Yuan

摘要

Negative carbon treatment of abandoned coal mine goaf under the “carbon peak, carbon neutral” initiative is a pressing research challenge. This study investigates the potential of using alkaline high-water materials to solidify supercritical CO2 and fill coal mine goafs, offering a novel solution to this issue. Comprehensive experiments, including scanning electron microscopy (SEM), and X-ray diffraction (XRD), were conducted to analyze the reaction mechanisms and mechanical properties of the solidified materials. Results reveal that 1 kg of high-water materials can solidify 53.5 g of CO2, with stable and environmentally benign calcium carbonate (CaCO3) as the primary product. The solidified material achieves a maximum tensile strength of 0.45 MPa and a compressive strength of 1.29 MPa. These values meet the strength requirements for grouting and filling coal mine goafs. This confirms the feasibility of using high-water materials solidified with supercritical CO2 for filling and treating goaf. The findings provide significant theoretical support for carbon dioxide sequestration in old goaf area.

Graphical abstract