Effect of carbon particles on heavy metal emissions under ash-melting conditions |
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Authors: | Hayato Hattori Ryo Yoshiie Hiroshi Moritomi |
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Institution: | 1. Environmental and Renewable Energy System, Graduate School of Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
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Abstract: | In Japan, incineration ash is subjected to a melting process to reduce waste volume and to stabilize hazardous heavy metals.
In previous articles, we reported that large quantities of volatile metals are emitted under ash-melting conditions at temperatures
higher than 1200°C and that such emissions are considerably increased under reducing conditions. However, the emission behavior
in the presence of large amounts of char particles was unclear, and we suspected that emissions under these conditions might
differ from emissions under the previous conditions. Therefore, we investigated heavy metal emissions and the melting characteristics
of ash in the presence of carbon particles. In this experiment, a small crucible with ash and carbon was rapidly heated using
a high-frequency induction-heating furnace to simulate the melting ash gasification with carbon. As a result, it was found
that additive carbon can promote emissions of heavy metals such as zinc and lead and control the melt of the ash. |
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