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煤层总是产于一特定的岩石组合中。地质学家将这种组合的岩石叫煤系地层。煤系地层除产有煤外,常常还含有许多共生、伴生矿产。这些矿产对国民经济同样具有重要意义。下面,让我们首先来看看煤系地层中的这些最重要的矿产。一、铝土矿。铝土矿几乎是当前提炼金属铝的唯一矿石。同时也可以作耐火材料。目前我国开采的铝土矿绝大多数来自煤系地层,例如
The coal seam is always produced in a specific rock assemblage. Geologists associate this combination of rocks with coal measures. In addition to coal-bearing strata coal, often also contains many symbiotic, associated minerals. These minerals are also of great significance to the national economy. Let us first look at these most important minerals in the coal strata. First, bauxite. Bauxite is almost the only ore currently refined aluminum. At the same time can also be used as refractory material. At present, the vast majority of bauxite mined in our country comes from coal-bearing strata, for example