Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment
Abstract This study examined the electrodissolution mechanism of five impure sphalerite samples, which differ significantly in purity levels, along with their partially oxidized counterparts in a 0.5 M H2SO4. Partially oxidized samples were prepared through an incomplete leaching of sphalerite using...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-01-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-87270-7 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832585850536329216 |
|---|---|
| author | Gholamreza Khodadadmahmoudi Saeid Karimi Hadi Abdollahi Milad Karimi Ali Rezaei Lana Alagha |
| author_facet | Gholamreza Khodadadmahmoudi Saeid Karimi Hadi Abdollahi Milad Karimi Ali Rezaei Lana Alagha |
| author_sort | Gholamreza Khodadadmahmoudi |
| collection | DOAJ |
| description | Abstract This study examined the electrodissolution mechanism of five impure sphalerite samples, which differ significantly in purity levels, along with their partially oxidized counterparts in a 0.5 M H2SO4. Partially oxidized samples were prepared through an incomplete leaching of sphalerite using H2SO4 with Fe2(SO4)3.H2O as an oxidizing agent. The original sphalerite samples and the partially oxidized samples were referred to as SP and POS samples, respectively. Analyses using XRD, SEM, Raman spectroscopy, and electrochemical techniques suggested presence of elemental sulfur and a metal-deficient layer on the surface of the POS samples. Cyclic voltammetry revealed that the sample with the highest iron content exhibited the highest electrochemical response, while the sphalerite with the highest lead concentration had the lowest activity. Electrochemical impedance spectroscopy (EIS) studies showed that impedance values were higher in the POS samples compared to the PS samples, indicating a correlation within the passivation phenomenon. In conclusion, these findings suggested that the sphalerite dissolution process is primarily controlled by charge transfer and kinetic polarization. This understanding can lead to the development of more selective and sustainable extraction methods and improving the overall economic viability of zinc hydrometallurgical operations. |
| format | Article |
| id | doaj-art-7a1d8cdaec5f4eafafdcd6995f3b9109 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-7a1d8cdaec5f4eafafdcd6995f3b91092025-01-26T12:28:13ZengNature PortfolioScientific Reports2045-23222025-01-0115111510.1038/s41598-025-87270-7Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environmentGholamreza Khodadadmahmoudi0Saeid Karimi1Hadi Abdollahi2Milad Karimi3Ali Rezaei4Lana Alagha5Department of Mining and Explosives Engineering, Missouri University of Science and TechnologyDepartment of Metallurgy and Materials Engineering, Hamedan University of TechnologySchool of Mining Engineering, College of Engineering, University of TehranDepartment of Mining and Metallurgical Engineering, Yazd UniversitySchool of Mining Engineering, College of Engineering, University of TehranDepartment of Mining and Explosives Engineering, Missouri University of Science and TechnologyAbstract This study examined the electrodissolution mechanism of five impure sphalerite samples, which differ significantly in purity levels, along with their partially oxidized counterparts in a 0.5 M H2SO4. Partially oxidized samples were prepared through an incomplete leaching of sphalerite using H2SO4 with Fe2(SO4)3.H2O as an oxidizing agent. The original sphalerite samples and the partially oxidized samples were referred to as SP and POS samples, respectively. Analyses using XRD, SEM, Raman spectroscopy, and electrochemical techniques suggested presence of elemental sulfur and a metal-deficient layer on the surface of the POS samples. Cyclic voltammetry revealed that the sample with the highest iron content exhibited the highest electrochemical response, while the sphalerite with the highest lead concentration had the lowest activity. Electrochemical impedance spectroscopy (EIS) studies showed that impedance values were higher in the POS samples compared to the PS samples, indicating a correlation within the passivation phenomenon. In conclusion, these findings suggested that the sphalerite dissolution process is primarily controlled by charge transfer and kinetic polarization. This understanding can lead to the development of more selective and sustainable extraction methods and improving the overall economic viability of zinc hydrometallurgical operations.https://doi.org/10.1038/s41598-025-87270-7SphaleritePartial leachingElectrometallurgyCyclic voltammetryElectrochemical impedance spectroscopy |
| spellingShingle | Gholamreza Khodadadmahmoudi Saeid Karimi Hadi Abdollahi Milad Karimi Ali Rezaei Lana Alagha Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment Scientific Reports Sphalerite Partial leaching Electrometallurgy Cyclic voltammetry Electrochemical impedance spectroscopy |
| title | Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment |
| title_full | Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment |
| title_fullStr | Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment |
| title_full_unstemmed | Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment |
| title_short | Electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment |
| title_sort | electrochemical insights into the direct dissolution of impure sphalerites and their partial oxidation in an acidic environment |
| topic | Sphalerite Partial leaching Electrometallurgy Cyclic voltammetry Electrochemical impedance spectroscopy |
| url | https://doi.org/10.1038/s41598-025-87270-7 |
| work_keys_str_mv | AT gholamrezakhodadadmahmoudi electrochemicalinsightsintothedirectdissolutionofimpuresphaleritesandtheirpartialoxidationinanacidicenvironment AT saeidkarimi electrochemicalinsightsintothedirectdissolutionofimpuresphaleritesandtheirpartialoxidationinanacidicenvironment AT hadiabdollahi electrochemicalinsightsintothedirectdissolutionofimpuresphaleritesandtheirpartialoxidationinanacidicenvironment AT miladkarimi electrochemicalinsightsintothedirectdissolutionofimpuresphaleritesandtheirpartialoxidationinanacidicenvironment AT alirezaei electrochemicalinsightsintothedirectdissolutionofimpuresphaleritesandtheirpartialoxidationinanacidicenvironment AT lanaalagha electrochemicalinsightsintothedirectdissolutionofimpuresphaleritesandtheirpartialoxidationinanacidicenvironment |