论文部分内容阅读
煤是由植物的堆积,腐烂、凝固、变化而成的成层的水成岩。在它里面,有各种植物组织,也有矿物质,主要的化学成分是碳氢化合物。煤大概可以分为泥煤、褐煤、烟煤、无烟煤四大类,及燭煤、藻煤等所谓腐泥煤,烟煤又可分为长焰煤、肥煤、瓦斯煤、焦煤、瘦煤等五类。煤层常与灰白色、灰色或灰黑色的页岩、砂岩及粘土生在一块,有时也与石灰岩或砾岩生在一块。如果有海相石灰岩,这种煤田称为近海煤田,如果没有海相石灰岩,便叫远海煤田。砾岩一般都产生在远海煤田中,表示附近
Coal is a layered sedimentary rock formed by the accumulation, decay, solidification and change of plants. Inside it, there are a variety of plant tissues, but also minerals, the main chemical components are hydrocarbons. Coal can be divided into peat, lignite, bituminous coal, anthracite four categories, and candle, algae and other so-called sapropel peat, bituminous coal can be divided into long flame coal, fat coal, gas coal, coking coal, lean five class. The coal seam is often associated with shale, gray or gray shale, sandstone and clay, sometimes with limestone or conglomerate. If there is marine limestone, this coalfield is called an offshore coalfield, and if there is no marine limestone, it is called a distant sea coalfield. Conglomerates are generally produced in far-off coalfields, indicating nearby