Volume 11, No. 4, August 2011, Pages 351-359 PDF(231 KB)
Identification the Content of the Windbox Dust Related to the Formation of PCDD/Fs during the Iron Ore Sintering Process
Yu-Chieh Kuo1, Yu-Cheng Chen1, Chi-Wei Yang2, Jin-Luh Mou3, Tung-Sheng Shih4, Perng-Jy Tsai1,4
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 and Hospital, 91, Hsueh-Shih Road, Taichung 40402, Taiwan
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.
Iron ore sintering; Windbox dusts; Chemical contents; PCDD/Fs; de novo synthesis.