Stainless steel from incinerator ash and slag
The ash and slag from incinerators contain a high percentage of metallic materials which however are hardly visibly recognisable after the incineration of the residual waste.Only a fraction of the metal can be separated from the slag and recycled using conventional techniques such as magnetic separators for iron scrap and eddy current separators for loose non-ferrous metals (mainly aluminium). Other valuable metals, currently stainless steel, copper, brass, zinc and lead end up nowadays in landfill sites. Conventional sorting machines which rely on metal detectors cannot solve this task because they unfortunately separate in addition to the heavy metals a significant amount of non recyclable slag rust and thereby heavily impurify the metal fraction.
The sensor technology developed by INCODECS is accurately positioned: only the heavy stainless steel and non-ferrous metals with clear edge parts are separated, yet the rust and burned iron are eliminated. The rust-containing minerals remain in the slag and can also be used for landfill. The metal proportion of the landfill fraction remains well below 1% by weight and a high level of non-magnetic metal particles are spared being used for landfill.
That is rigorous recycling under the most difficult conditions.