韩城矿区构造煤红外光谱特征研究

FTIR spectroscopic study on tectonically deformed coals in Hancheng mining area

为了探讨构造应力对不同变形类型的构造煤结构成分的影响,应用傅里叶变换红外光谱(FTIR)对韩城矿区不同类型构造煤进行应力对比分析,利用Peak Fit软件求解光谱二阶导数确定分峰峰位,进行分峰解叠处理以获取官能团的相对含量。结果表明:煤分子结构对构造应力具有响应;构造应力作用有利于芳烃氢发生化学环境的转移;在中高级烟煤阶段,强脆性变形有利于煤脂肪链脱落成小分子物质,强韧性变形有利于小分子物质逐渐缩聚成芳环,提高缩合度,使得芳烃C=C骨架振动有所提高;不同变形环境下,构造应力对煤分子结构的影响方式不同,但演化方向相同。

Fourier Transform Infrared Spectroscopy（ FTIR） was applied in studying the stress effect of compositions of coal macromolecular structure in different deformation environment tectonic coals in Hancheng Mining Area. The 2nd derivative was solved by Peak Fit to determine the peak center of various functional groups and obtain the relative amounts of them,respectively. The results show the coal macromolecular has a response to the stress. The coal marcomolecular is propitious to the transform of the aromatic hydrogen in chemical environment. In middle and higher rank bituminous coals,condensation reaction takes place to improve the degree of aromatic index. The aliphatic chain is easily abscised and decomposed into low weight molecular in strong brittle deformation,while it is condensed into aromatic rings in strong ductile deformation so as to improve the condensation and increase the absorbance of skeletal vibration of aromatic rings under strong tectonic deformation. The stress effect is different in various deformation environments,while the evolutionary direction is the same.