Process and apparatus for thermal decontamination of filter dusts and other residues

摘要

The process and apparatus according to the invention provide a decontamination of dioxin- and furan-containing dusts, which simultaneously also contain heavy metal compounds, by subjecting them to thermal decontamination in an inductively heated crucible furnace. The material to be decontaminated is put into the liquid state at temperatures between 1400 and 1600@C and appropriate residence time, toxic portions, such as dioxins and furans, being completely destroyed and heavy metals being bound so that they cannot be leached out. The material is tapped after a melting process and is cooled in a quenching vessel. Grinding is not necessary. Gaseous portions from the crucible furnace are passed through a high-temperature section, then quenched and particulate constituents are separated off in a high-performance deduster. The crucible furnace can be operated either batchwise or continuously; in the continuous mode, the outlet orifices are dimensioned in such a way that, from a defined temperature, the melt drains off by itself and throughput can be controlled via the furnace heating.