【摘要】 酸化是去除煤中矿物质的常用方法。对青龙构造煤和发耳构造煤及其经混合酸液（3%HCl+9%HF+3%CH₃COOH+2%KCl）酸化处理后的样品进行了SEM-EDS、X射线衍射（X-ray diffraction, XRD）、低温液氮吸附实验和分形维数分析。结果表明，酸化后煤样的裂隙尺寸和数量显著增加，矿物种类和含量发生改变，孔隙体积和分形维数提高。酸化优化了煤样的微观结构，增强了裂隙和孔道发育，提升了孔隙连通性。青龙煤样和发耳煤样的孔隙结构和吸附性能显著改变，但具体效果受原始特性和酸化条件影响。分形维数分析显示，酸化增强了微米孔隙的非均质性和粗糙性，降低了纳米孔隙的复杂性，这与微孔向中大孔的转化有关。因此，酸化对煤的孔隙结构具有显著的改善作用。更多还原

【Abstract】 Acidification is a common method for removing minerals from coal. In this study, samples of Qinglong tectonic coal and Fa’er tectonic coal, as well as those treated with a mixed acid solution（3% HCl + 9% HF + 3% CH₃COOH + 2% KCl）, were analyzed using SEM-EDS, XRD（X-ray diffraction）, low-temperature nitrogen adsorption experiments, and fractal dimension analysis. The results show that acidification significantly increases the size and number of fractures in the coal samples, alters the types and content of minerals, and increases pore volume and fractal dimension. Acidification optimizes the microstructure of the coal samples, enhances the development of fractures and channels, and improves pore connectivity. The pore structure and adsorption properties of the Qinglong and Fa’er coal samples are significantly altered, but the specific effects are influenced by the original characteristics of the coal and the acidification conditions. Fractal dimension analysis reveals that acidification enhances the heterogeneity and roughness of micropores while reducing the complexity of nanopores, which is related to the transformation of micropores into meso-and macropores. Therefore, acidification has a significant improvement effect on the pore structure of coal.更多还原