Environmental characterization of burnt coal gangue banks at Yangquan, Shanxi Province, China
Environmental characterization of burnt coal gangue banks at Yangquan, Shanxi Province, China
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DOI：
10.1016/j.coal.2008.04.003
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发表时间：
2008-07-07
影响因子：
5.6
通讯作者：
Wang, Y.
中科院分区：
文献类型：
--
作者：
Querol, X.;Izquierdo, M.;Wang, Y.
对山西阳泉煤矸石堆积场的环境特征进行了研究。由于煤炭产量大，该煤区煤矸石含量很高。因此，煤矸石自燃的广泛存在造成了严重的环境问题。煤矸石（包括散装煤矸石和特定岩性，如煤、富高岭石物质、砂岩、碳酸盐矿物和硫化物矿化）、燃烧煤矸石和燃气喷口凝析产物在矿物学、化学和浸出潜力方面进行了全面表征。燃烧后的煤矸石（方石、莫来石、赤铁矿、trydimite、堇青石）矿物共生，燃烧温度可达1200℃，实验室煅烧试验也证实了这一点。在燃烧过程中，一些元素如C、Cl、F、S、N、as、Cd、Hg、Pb、Sn、Ge和Se被排放到大气中。然而，冷凝过程可以部分捕获As、S、N、Hg和Se的气体排放。因此，富硒、富砷等微量元素的单质硫和铵盐的凝析矿化较为频繁。新鲜煤矸石中微量元素的浸出电位相对较低，而风化煤矸石和瓦斯排气孔凝析物的浸出会产生酸性浸出液，导致一些元素的可浸出水平相对较高，从而造成环境问题。(C) 2008 Elsevier B.V.版权所有
The environmental characteristics of coal gangue dumps in Yangquan (Shanxi Province, China) were investigated. The amounts of coal gangue are very high in this coal region given the large coal production. As a result, widespread spontaneous coal gangue combustion gives rise to serious environmental problems. Coal gangue (including bulk gangue and specific lithologies, such as coal, kaolinite-rich material, sandstone, carbonate minerals, and sulfide mineralizations), fired coal gangue and condensate products from gas vents were fully characterized with respect to mineralogy, chemistry and leaching potential. The mineral paragenesis of the fired coal gangue (cristobalite, mullite, hematite, trydimite, cordierite) showed that the combustion temperature could reach 1200 degrees C. This was also corroborated by laboratory calcination tests. During this combustion some elements such as C, Cl, F, S, N, As, Cd, Hg, Pb, Sn, Ge and Se are emitted into the atmosphere. However, condensation processes accounted for the partial trapping of gaseous emissions of As, S, N, Hg and Se. Thus, condensate mineralizations of elemental sulfur and ammonium salts enriched in Se, As and other trace elements are frequent in the gas vents. The leaching potential of trace elements in the fresh coal gangue was relatively low, but the leaching of weathered coal gangue and the gas vents condensates could give rise to environmental problems, as these materials produce acidic leachates and yield relatively high leachable levels of a number of elements. (C) 2008 Elsevier B.V. All rights reserved.