Study on the oxidation reaction of gangue-containing coal under different oxygen concentrations

作者：Haiqing Zhang, Jinlong He, Sen Qiao, Xinwei Guo, Jianwei Li · 发表于：Results in Engineering · 年份：2025 · DOI：10.1016/j.rineng.2025.105025 · 被引用次数：4 · 研究领域：Coal and Its By-products、Radioactive element chemistry and processing、Mine drainage and remediation techniques

• Spontaneous combustion of coal in goaf areas is a common problem in global mines. • At present, there is a lack of relevant research on gangue containing coal. • The emissions of CO 2 and CH 4 from gangue containing coal are temperature-sensitive. • Significant differences in oxygen consumption rate and activation energy. Gangue Containing Coal, a heterogeneous mixture generated during composite coal seam mining, exhibits oxidation and kinetic characteristics critical to the study of spontaneous combustion of residual coal in goaf areas and the safety of mine operations. This study conducted temperature-programmed gas chromatography experiments under variable oxygen conditions using gangue containing coal samples from the 4–2# coal seam of Wanli No.1 Mine, elucidating its oxidation behavior and kinetic properties under different oxygen concentrations .Key findings include: Under constant oxygen conditions: CO₂ and CH₄ volume concentrations demonstrate significant temperature sensitivity. As temperature increases from 30 °C to 150 °C, both gases exhibit exponential growth (R² > 0.95). Beyond the critical threshold (120 °C), gas production rates enter a decay phase, forming a “thermal-promotion and high-temperature suppression” pattern. Under isothermal conditions (e.g., 80 °C, a representative oxidation zone): Reducing oxygen concentration from 21 % to 5 % decreases CO₂ volume concentration by 92 %, CH₄ by 63 %, and oxygen consumption rate from 0.053 mol·s⁻¹·L⁻¹ to 0.038 mol...