煤中汞的赋存状态研究

Modes of Occurrence of Mercury in Coal

对采自贵州省二叠系龙潭组煤层的 32个煤样进行了连续化学浸取实验研究 ,并利用重液分离方法 ,将另外 8个采自同一地区的煤样按密度从 1.4至 2 .8× 10 3kg m3分成 10个密度段。通过测定化学浸取过程主要矿物组成的变化及汞的浸取量 ,对比研究各密度段分样中矿物组成和有机质含量与汞含量间关系 ,得出煤中汞主要赋存于黄铁矿中 ,煤样黄铁矿中汞的分布是不均匀的。研究表明 ,当煤炭被开采堆放到地表后 ,煤中大部分汞可以被酸性矿井水带入环境中 ,这一环境污染问题应予以重视。在洗煤过程中 ,平均 5 1%的汞可以被脱除。因此 。

The sequential extraction tests were carried out using 32 coals sampled from Longtan Group of Permian Period in Guizhou Province. Eight coal samples gathered from the same area were divided into 10 density fractions between <1.4 and >2.8×10 3?kg·[JX-9]m -3 by separation in heavy liquid mixture. Combining the results of mineral transformation and that of the amount of mercury leached during the leaching experiments with the results of the correlation between mercury and each mineral phase, organic matter from float sink experiments, the authors get the conclusion that mercury in coal mainly exist in sulfides. Studies also show that most of mercury in coal can be brought into the environment easily by acid mine drainage (AMD), and this kind of pollution should be paid more attention to. Mercury is not distributed in sulfides homogeneously in the same coal. During coal cleaning process, on the average, 51% of mercury in coal can be removed.