Thermal stability and occurrence of forms of mercury in Jincheng coal
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摘要: 利用程序升温热解反应器─元素汞在线检测系统联用装置,研究了晋城煤中汞的热稳定性以及与热稳定性相关的晋城煤中汞的赋存形态。研究表明,煤中大部分汞与煤中无机矿物质伴/共生,少部分与煤中有机质伴/共生。其中,在200℃~300℃和900℃~1200℃释放的汞与煤中无机矿物质伴/共生,在300℃~600℃释放的汞部分与无机矿物质伴/共生,部分与煤中有机质伴/共生。Abstract: The thermal stability of mercury in Jincheng (JC) coal was studied with TPD-AFS system. An Attempt was made to identify the occurrence of the forms of mercury in JC coal according to its thermal stability. The mercury released at 200℃~300℃ is associated with the sulphate minerals that can be leached by HCl and decomposed at lower temperature. The part of mercury released at 300℃~600℃ is associated with pyrite that can be leached by HNO3, while a part of mercury is associated with the organic matters in JC coal. The mercury released at 900℃~1200℃ is associated with silicate minerals that can be leached by HF and decomposed at higher temperature. In general, the most of mercury in JC coal associated with minerals and a small fraction of mercury associated with organic matters in coal.
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Key words:
- mercury in coal /
- thermal stability /
- occurrence of forms
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