The macerals of bark liptobiolite of Leping Mine in Jiangxi Province were separated by the method of Density Gradient Centrifugation,and the density distribution characteristic curves of coal of-200 mesh was drawn through analytical pre-separation experiments.The curves shows that the density distribution of liptinite and vitrinite of bark coal is relatively concentrated;it' s easy to separate specific macerals;while inertinite and vitrinite are so intermixed that the separation is less effective.The content of barkinite and vitrinite reaches over 98.6％ after the particular Density-gradient Centrifugation separation experiments.There are obvious differences between the two macerals of the separated samples in the chemical structure according to the high resolution TEM and image analysis:First,the number of the lattice fringes of barkinite is significantly greater than that of vitrinite,and the lattice fringes of barkinite are equipped with a characteristic of more disordered and concentrated;secondly,the proportion of different lattice fringes of vitrinite and barkinite is relatively close to each other,short aromatic fringe is dominant for both,while the difference is that the content of 1×1 (naphthalene) of vitrinite is obviously greater than that of barkinite,but the 3×3 aromatic fringe displays a completely opposite characteristic.The content of medium-long aromatic fringe is not high,but this value of barkinite is also significantly lower than that of vitrinite.%对江西乐平矿区的树皮残植煤采取密度梯度离心方法进行显微组分分离,在-200目破碎的条件下经过分析性预分离实验绘制了树皮煤中各显微组分的密度分布特征曲线,该曲线显示树皮煤中的壳质组和镜质组密度分布呈尖峰分布特征,进行特定显微组分分离效果较好.经过特定密度梯度离心法分离实验,树皮体和镜质体含量高达98.6％以上.分离后的样品经过高分辨透射电子显微镜技术和图像分析显示出该两种显微组分在化学结构上存在明显的差异:首先树皮体的晶格条纹数量明显高于镜质体,而且树皮体中所包含的晶格条纹呈现出更加无序和密集的特点；其次镜质体和树皮体所包含条纹种类各自所占的比例较为接近,均以低环数的芳香层片为主,所不同的是镜质体的1×1(萘)含量明显高于树皮体,但是其3×3的芳香层片明显低于树皮体.中—高环数的芳香层片虽然含量都不高,但树皮体所包含的此类芳香层片同样明显低于镜质体.
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