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Species and thermal stability of mercury captured by fly ashes
Author(s) -
Gao Zhengyang,
Ding Yi,
Han Wentao,
Hu Hongxiu,
Lv Shaokun
Publication year - 2017
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12488
Subject(s) - mercury (programming language) , fly ash , particulates , coal , environmental chemistry , sorption , chemistry , sulfur , mineralogy , adsorption , organic chemistry , computer science , programming language
Samples of fly ash were obtained from four boilers in China. The unburned carbon content, mercury concentrations, and mean ash particle size were measured. The ashes were heated at seven different temperatures, and the mercury released from the heated ashes was determined. The mercury species in the ashes were analyzed. The correlation between the mercury captured by ash and the carbon in ash was determined. The ratio of Hg to ash has an important role in particulate Hg formation. The high Cl content in coal does not absolutely result in the capture of more mercury by ash, but can result in high HgCl 2 ratio in particulate mercury. The HgO ratios are low, and the HgSO 4 ratios of all the ashes are negligible. The sulfur in coal is an important factor in the sorption of mercury by fly ash, and the high S content in coal results in a high HgS ratio in ash. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 460–467, 2017