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Progress in Plasma Processing of Materials, 1999

ISBN:
1-56700-126-2 (Print)

PLASMA PROCESS FOR THE VITRIFICATION OF INCINERATION FLYASH

K. Coulibaly
Laboratoire de Genie des Procedes Plasmas et Traitement de Surfaces Universite Pierre et Marie Curie - ENSCP 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 - France

F. Genet
Laboratoire de Genie des Procedes Plasmas et Traitement de Surfaces Universite Pierre et Marie Curie - ENSCP 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 - France

Daniel Morvan
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

M.F. Renou-Gonnord
Laboratoire des Mecanismes Reactionnels - CNRS URA 1307 Ecole Polytechnique - 91128 Palaiseau Cedex - France

Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

Abstract

The vitrification of municipal waste incineration flyash has been achieved using an argon: hydrogen: oxygen plasma torch. Three different phases were obtained from the vitrication process: a vitreous phase, a condensate and a gas effluent. Thermic and chemical balances were evaluated, in order to optimize the process, also regarding environmental regulation constraints. The role of carbon, oxygen and hydrogen was studied from thermodynamic and kinetic simulations and experimentally verified. A special focus was put on the fate of chlorine during the vitrification. It was demonstrated that volatil metals combine with chlorine and play the role of halogen sink limiting the formation of phosgenics. Metal halogenides were recovered in the condensates.