首页|Enhancing CO2 mitigation potential and mechanical properties of shotcrete in underground mining utilizing microbially induced calcium carbonate precipitation
Enhancing CO2 mitigation potential and mechanical properties of shotcrete in underground mining utilizing microbially induced calcium carbonate precipitation
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Achieving low-carbon development in the mining sector is fundamental for global carbon emissions abatement,especially considering the growing demand for mineral resources.Currently,the energy foot-print of mines emerges as the main carbon contributor.While cleaner energy sources have the potential for reducing emissions,transitioning to these sources remains challenging.This study presents a practical CO2 mitigation strategy for underground mining by integrating bacteria into shotcrete to enhance exca-vation.The findings demonstrate that bacteria can capture CO2 from the atmosphere,thereby increasing the carbonation reactions.X-ray diffraction (XRD),scanning electron microscope (SEM) and energy dis-persive spectrometer (EDS) analysis shows the captured CO2 present in the forms of calcite,vaterite,and aragonite.The formed carbonates intermingled with the precipitated calcium-silicate-hydrate (C-S-H) at relatively low bacteria additions,densifying the cementitious matrix and improving the mechan-ical properties.However,high bacteria concentrations lead to excess carbonates that consume C-S-H pre-cipitation,counteracting the benefits of carbonation and reducing mechanical strength.Optimal results were achieved with 0.3％ bacteria by mass fraction,potentially mitigating 0.34 kg/m2 of CO2,which is approximately equivalent 567 g of CO2 absorbed by 1 g of bacteria based on the effectiveness demon-strated in this study.These findings are crucial for advancing emissions control in mining and supporting climate goals outlined in the Paris Agreement.
Green miningTunnel supportShotcrete supportCO2 mitigationBiomineralization
Qiusong Chen、Xinyi Yuan、Aixiang Wu、Yikai Liu
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School of Resources and Safety Engineering,Central South University,Changsha 410083,China
School of Civil&Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China
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