Effect of cooling rate and basicity during vitrification of fly ash Part 2. On the chemical stability and acid resistance of slags.

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Effect of cooling rate and basicity during vitrification of fly ash Part 2. On the chemical stability and acid resistance of slags.
出版類型SCI(Sciences Citation Index)
出版年度2007
AuthorsHow-Ran Chao/Hao-Jan Chao, 趙浩然
開始頁554
頁數8
出版日期2007 / 10
其他編號0000
中文摘要

The object of this study is to investigate how the cooling rate and the basicity during the vitrification process govern the chemical stability
and acid resistance of slags. In this experiment, the incineration fly ashes with various basicities were vitrified at 1450 ?C and cooled down by
air cooling and water quenching, respectively. The amorphous volume fractions (AVF) in slags were estimated by X-ray diffraction analysis with
the addition of an internal standard. Scanning electron microscopy was applied to qualitatively examine the microstructures of the original and
the acid-immersed slags. It was verified that the addition of SiO2 and water quenching both significantly affected the crystalline characteristics of
the slag. When the basicity was >0.990, the AVF of slags was approximately equal regardless of the cooling rate. When the basicity was <0.674,
water quenching greatly enhanced the formation of glassy amorphous phase and the immobilization of metals in slags. In contrast, a lower basicity
(<0.511) is required if one wants to vitrify fly ash into slags and cool it down by air. As a whole, the glassy amorphous structure presented better
chemical resistance than the crystalline structure to decomposition by an acid.

期刊名稱Journal of Hazardous Materials
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