Extractability of metals in municipal solid wastes fly ash using supercritical CO(2) containing Cyanex 302. |
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| Authors: | Kayo Sawada Youichi Enokida Ichiro Yamamoto |
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| Institution: | EcoTopia Science Institute, Nagoya University, Nagoya. k-sawada@nucl.nagoya-u.ac.jp |
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| Abstract: | The extraction of lead from fly ash produced during the thermal treatment of municipal solid wastes was studied using supercritical carbon dioxide (SC-CO(2)) and Cyanex 302 (bis(2,4,4-trimethylpentyl)monophosphinic acid). The extraction of lead from the fly ash was carried out in a 5 cm(3) internal volume reaction vessel under static extraction conditions at 323 K, and 24 MPa for 1 h. The extraction efficiencies of lead ranged from 4% to the total extraction under the conditions of 0.05 g fly ash with 2 cm(3) Cyanex 302. There was a linear relationship between the extraction efficiencies of lead using the SC-CO(2) + Cyanex 302 and using a water-based method described by JLT13. |
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