New hydrometallurgical approaches for stainless steel dust treatment
| Autor: | Antti Kekki, Olof Forsén, Jari Aromaa, Hannu Makkonen, Anna Stefanova |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Chromium Compounds Kiln 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Zinc complex mixtures Stainless steel 020501 mining & metallurgy Geochemistry and Petrology Pickling Recycling ta215 Dissolution Electric arc furnace 021110 strategic defence & security studies fungi Metallurgy technology industry and agriculture Bag house dust General Chemistry Geotechnical Engineering and Engineering Geology Nickel 0205 materials engineering chemistry Leaching Leaching (metallurgy) |
| Zdroj: | Mineral Processing and Extractive Metallurgy. 125:242-252 |
| ISSN: | 1743-2855 0371-9553 |
| Popis: | In production of stainless steel 10–70 kg of dusts per tonne of steel is produced. The final rolling and pickling stages produce significant amounts of metal-rich wastes and acid sludge. The dusts are usually treated by pyrometallurgical methods such as plasma processing or Waelz kiln. Hydrometallurgical methods have been developed especially for the recovery of zinc from electric arc furnace (EAF) dusts, focusing on unalloyed steel EAF dust. A new concept has been developed to selectively leach out zinc from stainless steel production dusts enabling recycling the remaining iron, nickel and chromium compounds back to melting. Zinc can be dissolved using either a strong alkaline solution or strong acid solution. Factors affecting the leaching efficiency have been determined. Mineralogical factors limiting the zinc dissolution have been determined and pre-treatment methods have been developed. Using the optimal conditions the zinc level in the treated dust has been low enough allowing recycling of the dust ... |
| Databáze: | OpenAIRE |
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