Thermodynamic and experimental studies on condensation behavior of low-boiling-point elements volatilized in the melting process |
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Authors: | Shohichi Osada Dalibor Kuchar Hitoki Matsuda |
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Institution: | 1. Department of Energy Engineering and Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-shi, Aichi, 464-8603, Japan
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Abstract: | To study the volatilization and condensation behaviors of low-boiling-point elements in the waste melting process, experiments
were conducted to collect the dust from a coke-type incineration residue melting furnace. Then, a comparison was made between
the experimental results and the calculated values obtained from a thermodynamic equilibrium model in terms of the chemical
composition of the dust. The composition of the dust collected from a cylindrical filter in the exhaust gas duct was determined
by chemical methods, scanning electron microscopy/energy-dispersive X-ray spectroscopy, and X-ray analysis. As a result, the
sampled dust was classified into two different types: fine particles mainly containing Na, K, Pb, and Zn collected from the
side face of the cylindrical filter, and large particles containing Ca, Si, and Al collected from the bottom face of the cylindrical
filter. From X-ray analysis of the sampled dust, NaCl, KCl, PbS, and ZnS were identified in the fine-particle dust, while
CaO, SiO2, Al2O3 were detected in the large-particle dust. From the results of the thermodynamic equilibrium calculation in the gas cooling
process from 2000 to 600 K, it was found that Na, K, Pb, and Zn volatilized as metals in the melting furnace were condensed
as alkali chlorides such as NaCl and KCl and heavy metal sulfides such as PbS and ZnS. These computational results were in
good agreement with the X-ray diffraction results of the sampled dust at a gas temperature of 823 K for the formation of NaCl,
KCl, PbS, and ZnS. |
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