2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 4: Recycling & Secondary Battery
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 498 pages |
| ISBN: | 978-1-987820-06-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Strategies to recover the valuable metal fraction from flue dust of the secondary copper production
Rene Rumpold1; Juergen Antrekowitsch1;1CHRISTIAN DOPPLER LABORATORY FOR OPTIMIZATION AND BIOMASS UTILIZATION IN HEAVY METAL RECYCLING, Leoben, Austria;
Type of Paper: Regular
Id Paper: 32
Topic: 5
Abstract:
Nowadays, the processing of complex raw materials (e.g. electronic scrap, sludges) in copper secondary industry results in an increased input of further elements, like zinc, lead, tin, halogens etc. To recover high grade copper, the major parts of these impurities have to be removed through the slag- and dust in the smelting and converting stage. Subsequently, these process residues are enriched with the typical contaminants and therefore, they represent valuable by-products.
Especially the flue dusts contain high metal amounts (up to 50 % Zn) in the form of oxides, halides and further compounds. Unfortunately, it is not possible to use them directly in the primary zinc metallurgy because of high halogen concentrations, which are disturbing the electrowinning process. Moreover, the presence of high lead-, tin- and copper-concentrations results in higher efforts to recycle these elements within the primary zinc metallurgy. Therefore, separate recycling technologies have to be used to extract the valuable metal fraction from those residues.
Based on the wide range of different components and the strongly fluctuating compositions, the processing of copper secondary dusts can be complex. The variety of potential processes includes hydrometallurgical as well as pyrometallurgical techniques, which depend on the dust quality as well as the aimed products.
This work gives an overview on different strategies to recycle the valuable fraction from flue dusts of the copper secondary industry.