溶剂萃取下构造煤的XRD结构演化特征

发布时间：2018-03-16 10:39

本文选题：构造煤　切入点：溶剂萃取　出处：《光谱学与光谱分析》2017年10期 　论文类型：期刊论文

【摘要】：煤是一种短程有序、长程无序,且随着煤化程度的增加有序性增强、具有微晶或类晶态结构的沉积有机岩。在成煤过程中,地质构造的破坏作用使得煤发生不同程度的变形变质,引起煤的化学组成、微观结构发生变化,形成了不同煤体结构的构造煤。为了揭示构造破坏作用下,煤的微晶结构的变化特征,采用有机溶剂萃取的方法,对不同煤体结构的贫煤、气煤样进行了萃取。借助于X射线衍射(XRD)测试结果,探讨了煤样萃取前后的微晶结构的变化规律。研究发现:在溶剂萃取作用下,构造煤的萃取率所呈现的规律性变化并不因溶剂的种类、煤级的变化而改变,表现为溶剂萃取率均随着煤体破坏程度的增强而增大。室温条件下,溶剂的萃取并不足以改变高、低阶煤的微晶结构参数的对比关系,溶剂萃取前后均表现为贫煤的芳香层间距d002小于气煤,堆砌度Lc和芳香层数N大于气煤。进一步研究发现构造的破坏作用下,萃取后d002逐渐减小,Lc增大,而由于煤级的影响,以及溶剂的种类和渗入强弱不同,延展度La并没有表现出明显的规律性。
[Abstract]:Coal is a kind of short-range order and long-range disorder, and with the increasing degree of coalification order enhanced, sedimentary organic rocks have a crystalline structure of microcrystalline or class. In the process of coal formation, deformation and metamorphism destructive geological structure makes the coal in different degree, caused by coal chemical group, the micro structure changes, the formation of tectonic coal in different coal structures. In order to reveal the structure damage under the action of changing characteristics of coal crystallite structure, using the method of organic solvent extraction of different coal structure, coal, coal samples were extracted. By X ray diffraction (XRD) test results, discusses the variation of crystal structure before and after coal extraction. The study found: in the solvent extraction under the effect of changes in the rate of extraction of coal is not due to the type of solvent, the change of the coal rank change, performance for the solvent extraction rate with the destruction of coal The degree of increasing. Under the condition of room temperature, the solvent extraction is not enough to change the high contrast between crystallite structure parameters of low rank coal, solvent extraction before and after showed lean aromatic layer spacing D002 less than coal, piling up Lc and N is greater than the number of aromatic gas coal. Further research found that damage the structure. After extraction of D002 decreased, Lc increased, but due to the influence of coal rank, and the type of solvent and infiltration of different strength, ductility and La showed no obvious regularity.

【作者单位】：河南理工大学能源科学与工程学院;中原经济区煤层气(页岩气)协同创新中心;中国石油华北油田分公司勘探开发研究院;
【基金】：国家自然科学基金项目(41372162) 河南省高校科技创新团队支持计划(14IRTSTHN002)资助
【分类号】：O658.2;TQ531

【相似文献】