用XRD表征煤变质程度的改进方法

目前煤变质程度的X射线衡量方法存在γ带不好分峰、δ峰信息没有被使用、扣除背底不合理等问题，通过对比分析不同变质程度煤的X射线衍射图谱，提出在不扣除背底信息前提下，使用002峰斜率、延展半高宽和δ峰信息来修正变质系数公式。经过多组不同变质程度煤样X射线衍射（XRD）图谱的计算验证，表明该方法能够较好地表征煤的变质程度，避免了γ带不好分峰、δ峰有效信息没有使用和扣除背底不合理等问题，是一种简单可行而又较为准确的衡量煤变质程度的方法，建议在行业内推广使用。 

An improved method for characterizing coal metamorphism by XRD

At present, the X-ray measurement method of coal metamorphism has the problem that the γ band is not well divided, the δ peak information is not used, and the background of the bottom is unreasonable. The X-ray diffraction pattern of coal with different metamorphosed degrees is compared and studied. It is proposed to correct the metamorphic coefficient formula by using the information of the slope of the 002 peak, the extended half-height width and the δ peak without deducting the so-called background information. The calculation of the XRD patterns of coal samples with different degrees of metamorphism is verified. The method can better express the degree of metamorphism of coal, avoid the problem that the γ band is not well divided, the δ peak effective information is not used, and the background is unreasonable. It is a simple, feasible and accurate measure of coal metamorphism. The method of degree is recommended to be promoted in the industry.