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Title: Chlorides behavior in raw fly ash washing experiments.
Authors: Zhu, Fenfen
Takaoka, Masaki  kyouindb  KAKEN_id
Oshita, Kazuyuki  kyouindb  KAKEN_id
Kitajima, Yoshinori
Inada, Yasuhiro
Morisawa, Shinsuke  kyouindb  KAKEN_id
Tsuno, Hiroshi
Author's alias: 朱, 芬芬
Keywords: Fly ash
Washing
Chloride behavior
X-ray absorption near edge structure (XANES)
Issue Date: 15-Jun-2010
Publisher: Elsevier B.V.
Journal title: Journal of hazardous materials
Volume: 178
Issue: 1-3
Start page: 547
End page: 552
Abstract: Chloride in fly ash from municipal solid waste incinerators (MSWIs) is one of the obstructive substances in recycling fly ash as building materials. As a result, we have to understand the behavior of chlorides in recycling process, such as washing. In this study, we used X-ray absorption near edge structure (XANES) and X-ray diffraction (XRD) to study the chloride behavior in washed residue of raw fly ash (RFA). We found that a combination of XRD and XANES, which is to use XRD to identify the situation of some compounds first and then process XANES data, was an effective way to explain the chlorides behavior in washing process. Approximately 15% of the chlorine in RFA was in the form of NaCl, 10% was in the form of KCl, 51% was CaCl(2), and the remainder was in the form of Friedel's salt. In washing experiments not only the mole percentage but also the amount of soluble chlorides including NaCl, KCl and CaCl(2) decreases quickly with the increase of liquid to solid (L/S) ratio or washing frequency. However, those of insoluble chlorides decrease slower. Moreover, Friedel's salt and its related compound (11CaO.7Al(2)O(3).CaCl(2)) were reliable standards for the insoluble chlorides in RFA, which are strongly related to CaCl(2). Washing of RFA promoted the release of insoluble chlorides, most of which were in the form of CaCl(2).
Rights: © 2010 Elsevier B.V.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/128895
DOI(Published Version): 10.1016/j.jhazmat.2010.01.119
PubMed ID: 20171782
Appears in Collections:Journal Articles

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