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Progress in Plasma Processing of Materials, 1997

ISBN:
1-56700-093-2 (Print)

SEPARATION OF METALS FROM DUSTS IN A PLASMA SPOUTED BED REACTOR

A. Bamrim
Institut de Science et de Genie des Materiaux et Precedes, IMP-CNRS, B.P.5, Odeillo, 66125 FONT-ROMEU Cedex, FRANCE

Gilles Flamant
Laboratoire des Procedes, Materiaux et Energie Solaire, PROMES-CNRS UPR 8521, 7 rue du Four solaire, 66120 Font Romeu-Odeillo, France

J. Lecadet
Metaleurop Recherche, 1, Av. A. Einstein, 78193 TRAPPES CEDEX, France

Abstract

The use of an intermediate temperature (the spouted bed temperature) permits to improve the efficiency of metal separation from dusts injected in a plasma jet.
It is shown experimentally that separation of metals from a dust conaining Pb, Sn, As, Zn and In is affected by the oxygen partial pressure in the plasma jet, and by spouted bed temperature.
Under oxidizing and CO/C02 conditions in the jet, the best results have been obtained with a high bed temperature (1250K). Under reducing conditions (Ar-H2), the separation index of Indium exhibits a maximum at 930K bed temperature. A vapor containing respectively 6 and 4 times the In and As initial concentrations is collected in the fume, whereas the concentrations of Zn and Sn decrease 3 times.