Patent ID: 6315810
Filing Date: 2001-11-13
Classification: C03B,Y02P

Abstract:
A process for vitrifying heavy-metal-containing residues having a chlorine content above 10% by mass in which the residues are melted to form a melt in a melting furnace equipped with overfiring consisting of a main furnace and a discharge furnace and are then discharged, which comprises separating, in the main furnace a first fraction comprising readily volatile components containing heavy metals, and a second fraction comprising a liquid salt low in heavy metals, the second fraction being on an upper surface of the melt, the process including evaporating and conducting the first fraction out of the furnace together with exhaust gas followed by collecting the first fraction conducted out of the furnace as condensate, separating and discharging the second fraction from the surface of the melt, and further comprising setting a mass ratio between the first fraction and the second fraction in the range from 0.1 to 10.