Zhu Lei, Liu Chengyong, Xi Xian, Lu Shijian, Mei Jieqiong, Gu Wenzhe, Liu Zhicheng
China Coal Energy Research Institute Co., Ltd., Xi'an 710054, China.
China Coal Xi'an Design Engineering Co., Ltd., Xi'an 710054, China.
ACS Omega. 2025 Apr 27;10(17):17940-17947. doi: 10.1021/acsomega.5c01153. eCollection 2025 May 6.
Under the concept of integrated technology for coal mine disaster reduction and carbon dioxide (CO) emission reduction, this study investigates the effect and mechanism of CO storage through the mineralization of calcium carbide slag (CS) while exploring the inhibition effect of the resulting products on the spontaneous combustion of coal. The effects of different water-solid ratios, pressures, and rotational speed conditions on the mineralization of CS were analyzed. The results showed that the CO storage of carbide slag was positively correlated with pressure, and the carbonation efficiency was negatively correlated with pressure. With the increase of rotational speed, the amount of CO trapped by solid waste increases first and then tends to be flat (the increase of the CO trapped amount is small when the rotational speed is higher than 900 rpm). The amount of CO trapped in the solid waste was positively correlated with the water-solid ratio. Scanning electron microscopy/energy-dispersive spectroscopy (SEM-EDS) was used to analyze the microstructure changes of solid waste and mineralized samples. It was found that the particle morphology before and after mineralization produced many irregular calcium carbonate particles, and ESD results exhibited that the carbon content increased significantly. Moreover, it was found by gas chromatography that the CO production of the coal sample treated with carbide slag slurry decreased to varying degrees, which indicated the inhibition effect of mineralized products on natural coal processes, that the product after adding reinforced waste mineralized CO had a certain inhibitory effect on the coal oxidation reaction, further providing a theoretical basis for exploring the collaborative utilization of solid waste and carbon resources in coal mines.
在煤矿灾害防治与二氧化碳减排一体化技术理念下，本研究探究了电石渣（CS）矿化封存二氧化碳的效果及机理，同时探讨了所得产物对煤自燃的抑制作用。分析了不同水固比、压力和转速条件对CS矿化的影响。结果表明，电石渣的二氧化碳封存量与压力呈正相关，碳酸化效率与压力呈负相关。随着转速的增加，固体废弃物捕获的二氧化碳量先增加后趋于平稳（当转速高于900转/分钟时，捕获的二氧化碳量增加较小）。固体废弃物中捕获的二氧化碳量与水固比呈正相关。采用扫描电子显微镜/能谱仪（SEM-EDS）分析了固体废弃物和矿化样品的微观结构变化。发现矿化前后的颗粒形态产生了许多不规则的碳酸钙颗粒，能谱分析结果表明碳含量显著增加。此外，通过气相色谱法发现，用电石渣浆处理的煤样的一氧化碳产生量有不同程度的降低，这表明矿化产物对煤自燃过程有抑制作用，即添加增强废弃物矿化二氧化碳后的产物对煤氧化反应有一定的抑制作用，进一步为探索煤矿固体废弃物与碳资源的协同利用提供了理论依据。
