Process of immobilizing ashes by vitrification thereof in a plas

Details Process of immobilizing ashes by vitrification thereof in a plas Process of immobilizing ashes by vitrification thereof in a plas

1992-07-21

1994-01-25

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912137, 21912159, 21912148, 75 1019, 110243, 110250, B23K 900

Patent

active

052817903

ABSTRACT:
Disclosed is a process for immobilizing ashes by vitrification thereof in a plasma arc reactor, which is very efficient to treat ashes and any other pulverulent residues containing toxic leachable components that may be a source of pollution. The process makes use of a plasma reactor of the falling film type, in which an axial transferred or non-transferred arc melts and treats a load tangentially injected or otherwise blown in a cyclonic manner in a sleeve while this load falls down by gravity along the wall of the sleeve and accumulates at the bottom of the reactor in the form of a liquid bath. The load that is fed into the reactor consists of the ashes exclusively if they contain a sufficient amount of silica to make them self-vitrifying, or of a mixture of ashes with silica or another glass-forming agent. The temperature of the bath of glass that accumulates at the bottom of the reactor is controlled in a very precise and adequate manner to reduce as much as possible the formation of fumes and the risk of evaporation. The glass that is so obtained may be removed in a continuous manner from the bottom of the reactor, or poured out of the same at regular interval.

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