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Effect of cooling rate on the partition of heavy and alkali metals during waste incineration
Author(s) -
Han Jun,
Qing Linbo,
Xu Minghou,
Yao Hong,
Furuuchi Masami,
Hata Mitsuhiko
Publication year - 2012
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.486
Subject(s) - alkali metal , incineration , scanning electron microscope , metal , analytical chemistry (journal) , atmospheric temperature range , materials science , nucleation , chemistry , metallurgy , mineralogy , waste management , environmental chemistry , thermodynamics , composite material , organic chemistry , physics , engineering
The cooling rate is the most important factor affecting the partition of vapor metallic compounds in the downstream of waste incinerator. In this work, an experiment was performed in a bench‐scale incinerator to reveal the relationship between the cooling rate and the partition of heavy and alkali metals. Experimental results showed that the increase in cooling rate had a negative effect on the capture of heavy and alkali metals by silica filter in the temperature range of 26–160 °C/s. The higher cooling rate results in the formation of smaller particles, which are not easy to be captured by the silica filter. The optimum cooling rate for Cu gas–solid transformation was about 53.3 °C/s in the temperature range of 600–800 °C, and that for Na and K were 26.67 and 26.67 °C/s, respectively. The morphology observed by scanning electron microscope/energy dispersive using X‐ray (SEM‐EDX) confirmed that a large amount of vapor mineral matter or metals were transformed into solid or liquid phase by nucleation or condensation on the surface of the particles in the second and third filters. Moreover, the mass fraction of Pb in the second filter was as high as 37.0%, which means that the recovery of heavy and alkali metals by the multi‐section filter system is feasible. Copyright © 2010 Curtin University of Technology and John Wiley & Sons, Ltd.