The Brantner Group has been running a processing facility for waste incineration slag in Hohenruppersdorf, 30 km north of Vienna, since October 2013.
Working in collaboration with the University of Leoben, Brantner developed a system which is unique in the world and enables you to separate small and ultrasmall pieces of metal from slag and put them back into the material cycle. With the Brantner Wet Slag (BWS) system the slags are washed, heavy metals are separated by a density separation system and light metals are recovered using a nonferrous metal separator. A Fine Slag Treatment Plant (FSTP) to enable the separation of heavy metals weighing from 0.05 to 3 mm was additionally developed for this process.
The aim is to sort out all the metals which are left in the ash and slag and return them to the material cycle. As a result, for example, up to 95% of energy and 3.57 tonnes of CO2 per tonne of recycled aluminium can be saved compared to primary aluminium.
The slags treated are so clean after the process that they can be used as compacted and non-compacted load-bearing surfaces in road building, as concrete aggregates or raw material substitutes in cement production.