中国煤中硒的环境地球化学

Environmental Geochemistry of Selenium in Chinese Coal

硒是煤中易挥发元素之一。伴随煤炭的开采、利用,煤中硒可能进入环境并引起环境质量的变化,影响生态环境和人体健康。本文在全面综合国内外研究文献的基础上,分析了中国煤中硒在不同省份、不同成煤时代中的含量及分布规律,总结了硒在煤中的赋存状态、形成机理和影响因素,概括了煤在燃烧和淋溶过程中硒的迁移转化及其环境影响,指出中国煤中硒的含量在不同煤田、不同成煤时代及不同变质程度的煤中,含量差别较大,全国平均值约为5.60 mg/kg。

Selenium is one of the volatile elements in coal. With the mining and utilization of coal, selenium is largely released into the environment to influence environmental quality and to consequently impact on the ecological environment and human health. On the basis of foreign and domestic literatures in this field, this paper has analyzed selenium contents and distribution patterns of coals in different provinces of China, coals formed in different times, reviewed the occurrence mode, forming mechanism and influencing factors of selenium in coal, summarized the migration and transformation of selenium in the processes of coal combustion and leaching, and their subsequent environmental impact. The available data show that the selenium contents are varied remarkably in Chinese coals of dif- ferent coalfields, coals formed in different times, and coals experienced different extent of metamorphism. This review shows that the average selenium content in Chinese coal is 5.60 mg/kg.