Commenced in January 2007
Paper Count: 30576
Promising Immobilization of Cadmium and Lead inside Ca-rich Glass-ceramics
Abstract:Considering toxicity of heavy metals and their accumulation in domestic wastes, immobilization of lead and cadmium is envisaged inside glass-ceramics. We particularly focused this work on calcium-rich phases embedded in a glassy matrix. Glass-ceramics were synthesized from glasses doped with 12 wt% and 16 wt% of PbO or CdO. They were observed and analyzed by Electron MicroProbe Analysis (EMPA) and Analytical Scanning Electron Microscopy (ASEM). Structural characterization of the samples was performed by powder XRay Diffraction. Diopside crystals of CaMgSi2O6 composition are shown to incorporate significant amounts of cadmium (up to 9 wt% of CdO). Two new crystalline phases are observed with very high Cd or Pb contents: about 40 wt% CdO for the cadmiumrich phase and near 60 wt% PbO for the lead-rich phase. We present complete chemical and structural characterization of these phases. They represent a promising way for the immobilization of toxic elements like Cd or Pb since glass ceramics are known to propose a “double barrier" protection (metal-rich crystals embedded in a glass matrix) against metal release in the environment.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1057729Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1308
 ADEME, Techniques de gestion des déchets ménagers. France Norbert Plot, pp. 112, 1999.
 W. Wang and X. Wan, "A study on the character of heavy metal from municipal solid waste incinerator fly ash in China," in Proceeding of the world ingineer-s convention 2004, vol. D, pp. 54-57.
 P. Frugier, "Influence des variations de compositions des vitrifiats de REFIOM sur leur comportements ├á long terme," Ph.D. Thesis, Commissariat ├á l-énergie atomique, Paris, 2000.
 J. Yvon, D. Antenucci, E. A. Jdid, G. Lorenzi, V. Dutre, D. Leclerq, P. Nielson and M. Veschkens, "Long-term stability in landfills of Municipal Solid Waste Incineration fly ashes solidified/stabilized by hydraulic binders," Journal of Geochemical Exploration, vol. 85, pp. 143-155, 2006.
 T. M. El-Shamy and R. W. Douglas, "Kinetics of the reaction of water with glass," GlassTechnology, vol. 13, pp. 77-80, 1972
 W. Höland and G. Beall, Glass-ceramics technology, The American Ceramic Society, pp. 361, 2002.
 J. B. Jr. Watchman, Mechanical properties of ceramics, Wiley- Interscience, pp. 472, 1996
 L. Gautron, S. Greaux, D. Andrault, N. Bolfan-Casanova, N. Guignot and M. A. Boufhid, "Uranium in the earth-s lower mantle," Geophysical Research Letters, vol. 33, L23301, doi: 10.1029/2006GL027508, 2006
 S. Greaux, L. Gautron, D. Andrault, N. Bolfan-Casanova and M. A. Bouhifd, "Experimental high pressure and high temperature study of the incorporation of uranium in al-rich CaSiOÔéâ perovskite," Physics of the Earth and Planetory Interiors, doi:10.1016/j.pepi.2008.06.010, 2008.
 B. J. Wood, J. D. Blundy and A. C. Robinson, "The role of clinopyroxene in generating U-series disequilibrium during mantle melting" Geochim. Cosmochim. Acta, vol. 63. pp. 1613-1620, 1999.
 R. D. Shannon, "Revised Effective Ionic Radii and systematic Studies of Interatomic distances in Halides and Chalcogenides,"Acta Cryst, vol. A32, pp. 751-767, 1976.
 L. Barbieri, A. Corradi, I. Lancellotti, A. P. Novaes De Oliviera and O. E. Alarcon, "Nucleation and crystal growth of a MgO-CaO-Al2O3-SiO2 glass with added steel fly ash," Journal of American Ceramics Society, vol. 85, no. 3, pp. 670-674, 2002.
 G. Qian, Y. Song, C. Zhang, Y. Xia, H. Zhang and P. Chui, "Diopsidebased glass-ceramics from MSWI fly ash and bottom ash," Waste Management, vol. 26, no. 12, pp. 1462-1467, 2006.
 D. Andrault, D. Neuville, A. M. Flank and Y. Wang, "Cation site in Alrich MgSIO3 perovskite," American Mineralogist, vol. 83, pp.1045- 1053, 1998.