|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Two Step Dust Recycling – A Modern Recycling Technology for High Zinc Containing EAF-dusts
||Michael Johann Auer, Juergen Antrekowitsch
|On-Site Speaker (Planned)
||Michael Johann Auer
The Waelz kiln technology is still the state-of-the-art method for the recycling of high zinc containing dusts from iron and steel industry. Due to the fact that the quality of the produced crude zinc oxide is quite low and the Waelz process is leading to again 80 % of residues which must be landfilled, the technology gets under pressure of newly developed recycling methods. One of these technologies is the 2sDR (two step Dust Recycling) process which is based on highly proved aggregates in metallurgical environment. The first step consists of a vaporization of volatile compounds under oxidizing condition in a short rotary kiln. The removal of halogens leads to a higher quality of the ZnO end-product. The second part of the new technology is operated in an electric arc furnace under reducing atmosphere and produces additionally to the ZnO an oxidic phase which should be used in construction industry.