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Extraction of copper from copper slag: Mineralogical insights, physical beneficiation and bioleaching studies

  • Environmental Engineering
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Abstract

Copper slag was subjected to in-depth mineralogical characterization by integrated instrumental techniques and evaluated for the efficacy of physical beneficiation and mixed meso-acidophilic bioleaching tests towards recovery of copper. Point-to-point mineral chemistry of the copper slag is discussed in detail to give better insight into the association of copper in slag. Characterization studies of the representative sample revealed the presence of fayalite and magnetite along with metallic copper disseminated within the iron and silicate phases. Physical beneficiation of the feed slag (~0.6% Cu) in a 2 L working volume flotation cell using sodium isopropyl xanthate resulted in Cu beneficiation up to 2–4% and final recovery within 42–46%. On the other hand, a mixed meso-acidophilic bacterial consortium comprised of a group of iron and/or sulfur oxidizing bacteria resulted in enhanced recovery of Cu (~92–96%) from the slag sample. SEM characterization of the bioleached slag residue also showed massive coagulated texture with severe weathered structures. FE-SEM elemental mapping with EDS analysis indicated that the bioleached residues were devoid of copper.

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Authors and Affiliations

  1. Department of Bioresources Engineering, CSIR-Institute of Minerals and Materials Technology (IMMT), Bhubaneswar, 751013, Odisha, India

    Sandeep Panda, Srabani Mishra, Nilotpala Pradhan & Barada Kanta Mishra

  2. Department of Mineral Processing, CSIR-Institute of Minerals and Materials Technology (IMMT), Bhubaneswar, 751013, Odisha, India

    Danda Srinivas Rao & Shivakumar Angadi

  3. North Orissa University (NOU), Baripada, 757003, Odisha, India

    Sandeep Panda & Umaballava Mohapatra

Authors
  1. Sandeep Panda
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  2. Srabani Mishra
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  3. Danda Srinivas Rao
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  4. Nilotpala Pradhan
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  5. Umaballava Mohapatra
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  6. Shivakumar Angadi
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  7. Barada Kanta Mishra
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Correspondence to Sandeep Panda.

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Panda, S., Mishra, S., Rao, D.S. et al. Extraction of copper from copper slag: Mineralogical insights, physical beneficiation and bioleaching studies. Korean J. Chem. Eng. 32, 667–676 (2015). https://doi.org/10.1007/s11814-014-0298-6

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  • DOI: https://doi.org/10.1007/s11814-014-0298-6

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