【摘要】 系统分析了广西未变质煤、区域变质煤、岩浆变质煤和热液变质煤的Ｘ射线衍射特征。随煤变质程度升高，（００２）衍射峰的衍射角增大、半高宽缩小、芳环层面网间距缩小；（１０ｌ）衍射峰从无到有、半高宽缩小；第Ⅲ衍射峰仅在无烟煤中出现。对烟煤而言，其有序化程度的升高主要取决于煤中稠合度小的有机化合物的脱落；对无烟煤而言，其有序化程度的升高则取决于热液作用的次数和时间的长短。更多还原

【Abstract】 The X-ray diffraction patterns of unmetamorphosed,regionally metamorphosed, thermally metamorphosed and hydrothermally metamorphosed coals have been systematically analysed. For the (002) diffraction peak, the diffraction angle will increase, but the half-height width and the spacing of the plane net of aromatic ring layer will decrease with a gradual increase on coal rank. The (10l) diffraction peak will gradually appear and its half-width will decrease as the coal rank increases. The third diffraction peak, appearing when 2θ≈80°, only exists in anthracites. The ordering degree of bituminous coal will increase as the low-consistency organic compound in coal comes off. However, the ordering degree of anthracites is in direct proportion to the frequent and longterm hydrothermal process.更多还原