Process for reprocessing slag and/or ash from the thermal treatm

Details Process for reprocessing slag and/or ash from the thermal treatm Process for reprocessing slag and/or ash from the thermal treatm

1998-10-09

2000-03-14

Hoang, Tu Ba

Heating

Tumbler-type rotary - drum furnace

Having combustion products generated in or fed to drum

432 16, 110246, F27B 1500

Patent

active

06036484&

ABSTRACT:
In a process for reprocessing slag and/or ash from the thermal treatment of refuse, the refuse (1) is pyrolyzed, gasified or partially combusted in a first process step, heavy-metal-containing slag and/or ash (8) having a comparatively high carbon content being formed. Said slag and/or ash (8) is then heated in a rotary kiln (6) to a temperature below the melting temperature of the slag and/or ash (8) in a second process step, the slag and/or ash (8), prior to its discharge from the rotary kiln (6), dwelling sufficiently long in the rotary kiln (6), that the heavy metals present therein are converted into their metallic form by reduction at the carbon endogenous to the slag and the readily volatile heavy metals are transferred to the gas phase and are discharged from the rotary kiln (6) together with the flue gas (9), and finally a slag (15) depleted in heavy metals being discharged from the rotary kiln (6).

REFERENCES:
"Drehroohrofen", Esch, et al., pp. 415-431.
"InRec-Verfahren-Verwertung von Reststoffen aus der thermischen Abfallbehandlung", Simon, et al., ABB Technik Sep. 1995, pp. 15-20.

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