Investigations In The Improvement Of Recycling Of Electric Arc Furnace Dusts

Abstract:

Due to always getting stricter environmental legislations as well as increasing land filling fees the efforts for treating residues from metallurgy are increasing. In case of filter dusts from metallurgical industry the high zinc bearing EAF-dusts are one main source for the recovery of secondary zinc. Although the waelz kiln is state of the art, there are investigations to improve the recycling performance, to generate less newly residues, to achieve a better product quality and going hand in hand with that to prevent the further treatment in the primary industry. One concept which seems to yield fruits is a two step concept, which is investigated at the department for nonferrous metallurgy on the University Leoben/Austria, with a reducing metal bath as a core part. This would open the opportunity to recover more than one valuable metal, next to a cleaner product (ZnO) and less slag compared to recycling processes which are in use at the moment. Additionally an advantage is the high flexibility of this concept, due to that it is adaptable for a wide range of residues, like dusts from secondary copper industry, neutral leaching residues or even waelz slag.

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