| 中国煤中砷的含量分布、赋存状态、富集及环境意义 |
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| 关键词:Arsenic in coal modes of occurrence trace elements arsenism environmental geochemistry Chinese coals |
| 基金项目:国家自然科学基金项目(编号:40133010,40273035); 安徽省优秀青年基金项目(编号:04045064) |
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| 摘要: |
| Arsenic in Chinese Coals: Its Abundance, Distribution, Modes of Occurrence, Enrichment Processes, and Environmental Significance |
| Arsenic is one of the hazardous elements in coal. During coal processing and combustion, arsenic is released into the environment. Based on data available and research achievements, the authors reviewed in this paper abundance, distribution, modes of occurrence, geological processes for arsenic enrichment in Chinese coals as well as its environmental significance. The arsenic abundances are quite different in coals from different coal basins or of different geological ages and grades. The average arsenic content in Chinese coals is estimated to be 5 μg/g, excluding the Late Permian coals in southwestern China which have anomalously high arsenic content. Arsenic may occur in several modes in coals. It is most commonly contained in mineral matter, mainly pyrite and other sulfide minerals. Part of arsenic in coals is associated with the organic matter. The sources of arsenic in coal include parental plant materials, detrital minerals, basinal fluids, and hydrothermal fluids. In southwestern China, some Late Permian coals are anomalously enriched in arsenic because of the effect of hydrothermal fluids. Arsenic in these coals is mainly present in the form of arsenate (AsO_4 4+ ), and partly existent in pyrite. During coal combustion, most arsenic ends in the formation of fly ash, with a small part released into the environment. As a significant portion of arsenic is in the mineral matter, it may be removed with the mineral matter during coal preparation. |
| ZHENG Liu-gen,LIU Gui-jian,CHOU Chenlin,GAO Lian-fen,PENG Zi-cheng.2006.Arsenic in Chinese Coals: Its Abundance, Distribution, Modes of Occurrence, Enrichment Processes, and Environmental Significance[J].Acta Geoscientica Sinica,27(4):355-366. |
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