期刊
ATMOSPHERIC ENVIRONMENT
卷 92, 期 -, 页码 421-428出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2014.04.029
关键词
Cement plant; Mercury enrichment; Atmospheric emissions; Mercury speciation
资金
- Major State Basic Research Development Program of China (973 Program) [2013CB430001]
- Natural Science Foundation of China [21077065]
- Collaborative Innovation Center for Regional Environmental Quality
- Program for New Century Excellent Talents in University [NCET-10-0532]
- China Scholarship Council
The cement industry is one of the most significant anthropogenic sources of atmospheric mercury emissions worldwide. In this study of three typical Chinese cement plants, mercury in kiln flue gas was sampled using the Ontario Hydro Method (OHM), and solid samples were analyzed. Particulate matter recycling, preheating of raw materials, and the use of coal and flue gas desulfurization derived gypsum contributed to emissions of Hg in the air and to accumulation in cement. Over 90% of the mercury input was emitted into the atmosphere. Mercury emission factors were 0.044-0.072 g/t clinker for the test plants. The major species emitted into the atmosphere from cement plants is oxidized mercury, accounting for 61%-91% of the total mercury in flue gas. The results of this study help improve the accuracy of the mercury emission inventory in China and provide useful information for developing mercury controls. (C) 2014 Elsevier Ltd. All rights reserved.
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