亮煤

分析可知延安组煤层以暗煤为主，亮煤次之。

By analyzing we can know that the Yanan Formation is mainly durain , with bright coal taking the second place .

根据岩相的不同，把大同煤分为亮煤（C）和暗煤（D），以了解床温、停留时间和振动强度对碎裂特性的影响。

The Datong Bituminous coal was divided into clarain coal ( C ) and dull coal ( D ) according to their lithotypes to understand its fragmentation under different bed temperature , resident time , and vibrating frequency and amplitude .

两种亮煤用CS2-NMP溶剂抽提后的结果分析

Analysis on the results of two clarains extracted by mixed solvent of cs_2-nmp

煤岩类型为光亮、半亮煤；

Lithotype is belonged to bright coal and semibright coal ;

结果表明：不同煤岩类型条带中，裂隙密度具有较大的差异，镜亮煤条带是裂隙分布的主要部位；

The results show that the difference of fracture densities in different lithotype bands is large .

结果显示：镜煤、亮煤内部过渡孔和微孔相对较发育，瓦斯主要吸附在煤中的微孔中，故镜煤、亮煤的吸附空间较大。

Results display : transitional span and microporous pore interior of vitrain and clarain growth relatively . Whereas gas adhere to microporous pore . So vitrain and clarain have more adsorption space .

含铀、锗煤主要为煤化程度低的褐煤，属于半暗-半亮、暗-亮煤及亮-暗煤。

Uranium , germanium-bearing coals are mainly lignites of low grade incoalation and belong to semidurain , semiclarain .