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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v1.i4.30
pages 441-448

COMBINED EFFECTS OF OXYGEN, CHLORINE AND WATER VAPOR ON THE VAPORIZATION OF HEAVY METALS DURING FLY ASHES VITRIFICATION BY PLASMA

J. M. Badie
C. N. R. S., Institut de Science et de Genie des Materiaux et Procedes B. P. 5, Odeillo, F-66125 Font-Romeu Cedex
X. Chen
Institut de Science et de Genie des Materiaux et Precedes - CNRS BP. 5 - ODEILLO - 66125 FONT-ROMEU CEDEX - France
Gilles Flamant
CNRS PROMES UPR 8521, Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France
D. Gauthier
Institut de Science et de Genie des Materiaux et Precedes - CNRS BP. 5 - ODEILLO - 66125 FONT-ROMEU CEDEX - France

RESUMO

The vaporization of fly ash from municipal waste incinerators during vitrification by plasma is the result of the complex interaction of 02, Cl2, H20 with a multicomponent molten bath at different temperatures. It is shown theoretically that vaporization rate decreases with 02 partial pressure and that H20 affects mainly the equilibrium pressure of alkali (Na, K). The influence of Cl2 is proved to be temperature dependent. At low temperature (1500 K) the Cl2 pressure increase causes the enhancement of the heavy metals vaporization (Pb and Zn), whereas the effect is negligible at high temperature. The main part of chlorine is associated with Na and K in the fumes.
Concerning the interest of chlorine elimination by ash washing, the theoretical analysis shows the possible decrease of heavy metal evaporation, but it is not observed experimentally due to the modification of electric arc characteristics and bath temperature with and without chlorine.