International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
Vol. 11, No. 4, 2014, pp. 959-966
Bioline Code: st14094
Full paper language: English
Document type: Research Article
Document available free of charge
International Journal of Environment Science and Technology, Vol. 11, No. 4, 2014, pp. 959-966
© International Journal of Environment Science and Technology
Removal of lead from cathode ray tube funnel glass by chloride volatilization|
Grause, G.; Yamamoto, N.; Kameda, T. & Yoshioka, T.
Cathode ray tube funnel glass is an environmentally
problematic relict of old television sets. In particular,
landfilling of this material is strongly discouraged
because of its high lead content. However, recovery of this
toxic lead could prevent its release into the environment
and allow its reuse. In this research, lead was separated
from the glass matrix by a chloride volatilization process.
Melting of the funnel glass together with CaCl2 resulted in
the volatilization of 80 % of lead at 1,000 °C. The use of
NaCl as a chlorination agent yielded less volatile lead,
while poly(vinyl chloride) and gaseous HCl proved to be
ineffective chlorination agents. The differences in the
chlorination agent efficiencies could be attributed to differences
in the corresponding formation of silicates.
Energy-dispersive X-ray spectroscopy showed that diffusion
plays an important role in the volatilization of PbCl2.
Recycling; Sodium chloride; Calcium chloride; Polyvinyl chloride; Thermodynamics; Diffusion
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