x射线衍射原子分布函数法测定煤的真密度

DETERMINATION OF SKELETAL DENSITY OF COAL BY ATOMIC DISTRIBUTION FUNCTION OF X-RAY DIFFRACTION

用ｘ射线广角衍射原子分布函数方法测试了不同煤化程度煤的真密度，并与按常规方法（国家标准）测定的结果进行了对比。结果发现，两种测定结果随煤化程度的变化关系相一致，都呈一凹面向上的曲线。ｘ射线方法测定结果较国家标准测定方法所测结果略高，这是由于煤中存在封闭孔所致。

The skeletal density of four kinds of coal in different rank is determined by atomic distribution function of wide angle x-ray diffraction spectrum (WAXS) and a common method using hydrometer. The relationship between density and coal rank obtained from the above two methods is alike , and appears concave up curves.In addition,the result from the first method is a bit higher than that from the second method due to the existence of close pores in these coal.