Characterization of mechanochemical treated fly ash froma medical waste incinerator
Zheng Peng , Qiong Ding , Yangzhao Sun , Chen Jiang , Xinhua Gao , Jianhua Yan
DOI:
Received November 22, 2009,Revised April 14, 2010, Accepted , Available online
Volume 22,2010,Pages 1643-1648
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The mechanochemical treatment of fly ash generated from a medical waste incinerator was subjected to grinding for 2 hr at 400
r/min in a planetary ball mill. The treated fly ash was characterized by a suite of analytical methods including High Resolution Gas
Chromatograph/High Resolution Mass Spectrometer, Mastersizer 2000 Particle Size Analyzer, QUADRASORBTM SI Surface Area
Analyzer, Scanning Electron Microscopy and X-ray di raction. Results showed that abatement e ciency of polychlorinated dibenzop-
dioxins and polychlorinated dibenzofurans (PCDDs/Fs) in terms of total concentration averagely amount to 76% which was relatively
higher than that of I-TEQ concentration averagely amount to 56%; the most concentration of toxic congeners as well as isomers of
PCDDs/Fs decreased after mechanochemical treatment. The treated fly ash was characterized by a more homogeneous distribution of
concaves as well as the significant decreasing in overall particle size and great enlargement in surface area. The major crystallization
phases or intensities were considerably changed by mechanochemical treatment, of which a new phase containing chlorine formed may
be a possible factor suggesting chlorination reaction occurring on the crystalline surface.
