Extractability of metals in municipal solid wastes fly ash using supercritical CO(2) containing Cyanex 302.
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.
Sawada
Kayo
K
EcoTopia Science Institute, Nagoya University, Nagoya. k-sawada@nucl.nagoya-u.ac.jp
Enokida
Youichi
Y
Yamamoto
Ichiro
I