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Indium Electrowinning from Sulfate Solutions: the Influence of Cathodic Support on the Process Effectiveness

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Abstract  

The indium recovery via electrowinning from sulfate baths has recently gained significant attention as it does not present toxic emissions, hermetically sealed system requirements, human health, and environmental hazards. Following previous works related to the optimization process for AISI 316L and Ni cathode, it was observed significant importance of the metal supports on the input and output parameters of the indium electrowinning process from sulfate solutions. Thus, comparing input and output parameters in both cases seems very interesting. Particularly, regarding the input parameters, the attention has been focused on the electrolyte composition, current density, and temperature, while productivity, morphology, and structure have been considered regarding the output parameters. Considering the productivity as the optimal output, the findings for Ni cathode were better than that for AISI 316L in most of the selected conditions studied. In the case of morphology, indium grains appear rounded and dendritic on the AISI 316L, while those on the Ni cathode show stratified lamellar grains. Anyway, the indium deposit obtained on Ni cathode shows bigger grains independently from the used operative conditions with respect to that on AISI 316L. Regarding the structure, it is clearly tetragonal, but preferential orientation, crystallinity, and deformation of the structure strongly depend on the metal support.

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Authors and Affiliations

  1. Department of Engineering Sciences, Guglielmo Marconi University, 00193, Rome, Italy

    E. Ciro

  2. SBAI, University Sapienza Rome, Via Castro Laurenziano 7, 00161, Rome, Italy

    A. Dell’Era

  3. DICMA, University Sapienza Rome, Via Eudossiana 18, 00184, Rome, Italy

    C. Lupi

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  1. E. Ciro
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  2. A. Dell’Era
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  3. C. Lupi
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Correspondence to A. Dell’Era.

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Ciro, E., Dell’Era, A. & Lupi, C. Indium Electrowinning from Sulfate Solutions: the Influence of Cathodic Support on the Process Effectiveness. Mining, Metallurgy & Exploration 40, 1299–1309 (2023). https://doi.org/10.1007/s42461-023-00789-z

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