کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
581110 | 1453157 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of Fe compounds in light aggregate formation from a reservoir sediment
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
A one-step thermal process at 1050 °C and 1150 °C including bloating and sintering reactions produced lightweight aggregates (LWAs) with an apparent particle density of 2.08 and 1.18 g cmâ3, respectively, from pellets made of the sediment of a local reservoir. The roles of Fe compounds occurred in the sediment in bloating mechanism were determined with X-ray absorption spectroscopy (XAS) technique. About 59 at% of the total Fe is in forms of Fe2+ in the raw sediment; whereas most Fe was oxidized to Fe3+ in all LWAs, except in core part of the LWA produced at 1150 °C. The bloating reactions occurred in the core of the 1150 °C LWA is suggested to be mainly associated with the decomposition of FeSO4 into FeO with a concomitant release of SO2, SO3, and O2; the valence state of Fe was not changed. The generally accepted mechanism - the chemical reduction of Fe2O3 component to FeO with a release of O2 is responsible for the bloating phenomenon - is not observed in present study.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 171, Issues 1â3, 15 November 2009, Pages 111-115
Journal: Journal of Hazardous Materials - Volume 171, Issues 1â3, 15 November 2009, Pages 111-115
نویسندگان
Y.-L. Wei, Y.-Y. Lin,