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Identification the Content of the Windbox Dust Related to the Formation of PCDD/Fs during the Iron Ore Sintering Process

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Volume: 11 | Issue: 4 | Pages: 351-359
DOI: 10.4209/aaqr.2011.03.0024
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Yu-Chieh Kuo1, Yu-Cheng Chen1, Chi-Wei Yang2, Jin-Luh Mou3, Tung-Sheng Shih4, Perng-Jy Tsai 1,4

  • 1 Department of Environmental and Occupational Health, Medical College, National Cheng Kung University, 138, Sheng-Li Road, Tainan 70428, Taiwan
  • 2 Department of New Materials Research & Development, China Steel Corporation, 1 China Steel Road, Kaohsiung, Taiwan
  • 3 Department of Occupational Safety and Health, Chung Hwa University of Medical Technology, 89 Wenhwa first street, Tainan71703, Taiwan
  • 4 Department of Occupational Safety and Health, College of Public Health, China Medical University, 91, Hsueh-Shih Road, Taichung 40402, Taiwan

Abstract

This study measured the contents of the ionic and elemental constituents, and the chemical compounds containing in windbox (WB) dusts collected from a commercial iron ore sintering plant, then the results were used to identify possible PCDD/Fs formation pathways in the WB. We found that the abundance in both KCl and NaCl may provide a suitable condition for de novo synthesis of PCDD/Fs in the WB. Al, Fe, K, Ca, and Pb were the top five contents in WB16 dusts, but the co-existence of the above five metal contents warrants the need for further investigation on their roles in PCDD/F formation processes in the future. Although a low concentration of Cu was detected, it might be of importance to PCDD/Fs formation inside the WB. A total of 29 chemical compounds were identified. Among them, several oxygenated organic compound might be associated with PCDD/F formations at the beginning stage, but the roles of aromatic oxygenates on the formation of PCDD/Fs required further investigation. Finally, possible de novo synthesis pathways of PCDD/Fs were proposed based on the above findings. However, the above pathways are required further laboratory studies for validation before possible formation suppression approaches can be determined.

Keywords

Iron ore sintering Windbox dusts Chemical contents PCDD/Fs de novo synthesis


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