2008年6月
Chloride chemical form in various types of fly ash
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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- 巻
- 42
- 号
- 11
- 開始ページ
- 3932
- 終了ページ
- 3937
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/es7031168
- 出版者・発行元
- AMER CHEMICAL SOC
Chloride content is a critical problem for the reuse of fly ash as a raw material in cement, and the method used by recyclers to reduce the fly ash chloride content depends on the chemical form of the chlorides. However, limited information is available on the quantitative distribution of chlorides and the identity of some chlorides such as Friedel's salt We examined chloride forms and percentages using X-ray absorption near edge structure and X-ray diffraction analyses, as well as corresponding washing experiments. Approximately 15% of the chlorine in raw fly ash was estimated, to be in the form of NaCl, 10% in KCl, 50% in CaCl2, and the remainder in the. form of Friedel's salt Fly ash collected in a bag filter with the injection of calcium hydroxide for acid gas removal (CaFA) contained 35% chlorine as NaCl, 11% as KCl, 37% as CaCl2, 13% as Friedel's salt, and the remaining 4% as CaClOH. In fly ash collected in a bag filter with the injection of sodium bicarbonate for acid gas removal (NaFA), approximately 79% of chlorine was in NaCl, 12% was in KCl, and 9% was in Friedel's salt.
- リンク情報
- ID情報
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- DOI : 10.1021/es7031168
- ISSN : 0013-936X
- PubMed ID : 18589947
- Web of Science ID : WOS:000256274300009