Hydrometallurgical extraction of valuable metals from electric arc furnace dust originated in stainless steel production

Research output: ThesisMaster's Thesis

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Abstract

Regarding the growing production rates of metals, there is also a direct proportional increase in the accumulation of corresponding by-products like dust. These often contain, as in the case of stainless steel production, valuable metal like Cr, Ni, and Mo, which would be lost if no actions would be taken. To counteract the resulting dependency on imports, material loss, economic and ecological effects, the interest in recycling of those residues has grown in the last decade. Though most industrially applied processes recover these metals from dust by pyrometallurgical means, the research in hydrometallurgical methods to recover metals has gained attention. This is due to the flexibility of such solutions in dealing with inhomogeneous input materials and the ease with which they can be adapted in their design. Therefore, a new hydrometallurgical approach in the extraction of Cr and Ni by dissolving stainless steel dust in five different acids has been conducted in the course of this thesis. Through these leaching experiments, the knowledge of the need for harsher conditions, like higher temperature, longer leaching time and higher acidity has been gained. Simultaneously, an optimized setup for such conditions was developed, that counteracts the disadvantages which were noticed while conducting the experimental campaigns. Based on these results and optimizations, future campaigns with and without pre-treatment of dusts to recover valuable metals by leaching and following precipitation steps, are in development.
Translated title of the contributionHydrometallurgische Extraktion wertvoller Metalle aus dem Staub von Elektrolichtbogenöfen, welcher bei der Herstellung von rostfreiem Stahl anfällt
Original languageEnglish
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Steinlechner, Stefan, Supervisor (internal)
Award date22 Mar 2024
DOIs
Publication statusPublished - 2024

Bibliographical note

no embargo

Keywords

  • Hydrometallurgy
  • Residue processing
  • Extraction of valuable metals
  • Electric arc furnace dust
  • Stainless steel mill dust

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