Abstract
The chemical forms of the carbon and chlorine present in dust samples obtained from windboxes of the iron ore sintering machine have been studied with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The chlorine in the dust samples is present as KCl with the average crystalline size of 40-50 nm and covalent C-Cl bonds in condensed aromatic structures of unburned carbon surface. The proportion of chlorinated aromatic structures increases almost linearly with increasing that of surface oxygen complexes on unburned carbon, strongly suggesting that active surface sites of the carbon formed in the sintering process work as reaction sites with HCl and Cl 2. Model experiments using a coke show that HCl reacts with it at 500°C to form several types of Cl-functional forms, from which the HCl desorption takes place at the wide range of 500-900°C upon reheating. Such a profile for HCl formation is almost unchanged after washing of the HCl-treated coke by water. These observations indicate the formation of organic chlorides. It is therefore likely that HCl and Cl 2 evolved in the combustion process react with active sites of unburned carbon surface to form organic chlorine compounds.
| Original language | English |
|---|---|
| Pages (from-to) | 751-756 |
| Number of pages | 6 |
| Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
| Volume | 91 |
| Issue number | 10 |
| Publication status | Published - Oct 2005 |
| Externally published | Yes |
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Keywords
- Carbon forms
- Chlorine forms
- Coke
- Dust
- Iron ore sintering
- Organic chlorine compounds
- Unburned carbon
ASJC Scopus subject areas
- Metals and Alloys
Cite this
Functional forms of carbon and chlorine in dust samples formed in the sintering process of iron ores. / Tsubouchi, Naoto; Kasai, Eiki; Kawamoto, Katsuya; Noda, Hidetoshi; Nakazato, Yoshihiro; Ohtsuka, Yasuo.
In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 91, No. 10, 10.2005, p. 751-756.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Functional forms of carbon and chlorine in dust samples formed in the sintering process of iron ores
AU - Tsubouchi, Naoto
AU - Kasai, Eiki
AU - Kawamoto, Katsuya
AU - Noda, Hidetoshi
AU - Nakazato, Yoshihiro
AU - Ohtsuka, Yasuo
PY - 2005/10
Y1 - 2005/10
N2 - The chemical forms of the carbon and chlorine present in dust samples obtained from windboxes of the iron ore sintering machine have been studied with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The chlorine in the dust samples is present as KCl with the average crystalline size of 40-50 nm and covalent C-Cl bonds in condensed aromatic structures of unburned carbon surface. The proportion of chlorinated aromatic structures increases almost linearly with increasing that of surface oxygen complexes on unburned carbon, strongly suggesting that active surface sites of the carbon formed in the sintering process work as reaction sites with HCl and Cl 2. Model experiments using a coke show that HCl reacts with it at 500°C to form several types of Cl-functional forms, from which the HCl desorption takes place at the wide range of 500-900°C upon reheating. Such a profile for HCl formation is almost unchanged after washing of the HCl-treated coke by water. These observations indicate the formation of organic chlorides. It is therefore likely that HCl and Cl 2 evolved in the combustion process react with active sites of unburned carbon surface to form organic chlorine compounds.
AB - The chemical forms of the carbon and chlorine present in dust samples obtained from windboxes of the iron ore sintering machine have been studied with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The chlorine in the dust samples is present as KCl with the average crystalline size of 40-50 nm and covalent C-Cl bonds in condensed aromatic structures of unburned carbon surface. The proportion of chlorinated aromatic structures increases almost linearly with increasing that of surface oxygen complexes on unburned carbon, strongly suggesting that active surface sites of the carbon formed in the sintering process work as reaction sites with HCl and Cl 2. Model experiments using a coke show that HCl reacts with it at 500°C to form several types of Cl-functional forms, from which the HCl desorption takes place at the wide range of 500-900°C upon reheating. Such a profile for HCl formation is almost unchanged after washing of the HCl-treated coke by water. These observations indicate the formation of organic chlorides. It is therefore likely that HCl and Cl 2 evolved in the combustion process react with active sites of unburned carbon surface to form organic chlorine compounds.
KW - Carbon forms
KW - Chlorine forms
KW - Coke
KW - Dust
KW - Iron ore sintering
KW - Organic chlorine compounds
KW - Unburned carbon
UR - http://www.scopus.com/inward/record.url?scp=28244487186&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=28244487186&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:28244487186
VL - 91
SP - 751
EP - 756
JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
SN - 0021-1575
IS - 10
ER -