Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching
This study presents an innovative electrochemical method for producing ultra-fine Nickel Pig Iron (NPI) powders through anodically induced overpotential electrolysis, achieving a significantly high surface area and exceptional sulfuric acid leaching efficiency. Nickel, a critical material for energy...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-08-01
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| Series: | Electrochemistry Communications |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1388248125000761 |
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| author | Namhun Kwon Myungsuk Kim Soongju Oh Jae Hong Shin Kyoung-Tae Park |
| author_facet | Namhun Kwon Myungsuk Kim Soongju Oh Jae Hong Shin Kyoung-Tae Park |
| author_sort | Namhun Kwon |
| collection | DOAJ |
| description | This study presents an innovative electrochemical method for producing ultra-fine Nickel Pig Iron (NPI) powders through anodically induced overpotential electrolysis, achieving a significantly high surface area and exceptional sulfuric acid leaching efficiency. Nickel, a critical material for energy applications, faces increasing supply constraints, leading to greater reliance on intermediates like nickel sulfate. Conventional high-pressure acid leaching (HPAL) processes, while effective, suffer from high operational costs and excessive acid waste generation. To address these challenges, this study employs anodic oxidation of NPI under high-voltage conditions (≥10 V), facilitating particle refinement and enhanced electrochemical reactivity. Electrochemical characterizations, including cyclic voltammetry, chronoamperometry, and Pourbaix diagram analysis, confirm the formation of oxidized Ni-rich phases at optimal voltage ranges with peak current exceeding 10 A. The resulting fine NPI powders exhibit a leaching efficiency surpassing 95 % in 2 mol/L sulfuric acid at ambient temperature and pressure, demonstrating their potential as a cost-effective alternative to HPAL. Further post-process evaluations reveal critical electrolysis parameters influencing oxidation behavior and leaching performance, providing key insights for optimizing nickel extraction via anodic electrolysis. |
| format | Article |
| id | doaj-art-1e2fe040c2e148c18493834df4f600da |
| institution | Kabale University |
| issn | 1388-2481 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Electrochemistry Communications |
| spelling | doaj-art-1e2fe040c2e148c18493834df4f600da2025-08-20T03:56:41ZengElsevierElectrochemistry Communications1388-24812025-08-0117710793710.1016/j.elecom.2025.107937Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leachingNamhun Kwon0Myungsuk Kim1Soongju Oh2Jae Hong Shin3Kyoung-Tae Park4Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea; Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of KoreaKorea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea; Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of KoreaDepartment of Materials Science and Engineering, Korea University, Seoul 02841, Republic of KoreaKorea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea; Corresponding authors.Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea; Corresponding authors.This study presents an innovative electrochemical method for producing ultra-fine Nickel Pig Iron (NPI) powders through anodically induced overpotential electrolysis, achieving a significantly high surface area and exceptional sulfuric acid leaching efficiency. Nickel, a critical material for energy applications, faces increasing supply constraints, leading to greater reliance on intermediates like nickel sulfate. Conventional high-pressure acid leaching (HPAL) processes, while effective, suffer from high operational costs and excessive acid waste generation. To address these challenges, this study employs anodic oxidation of NPI under high-voltage conditions (≥10 V), facilitating particle refinement and enhanced electrochemical reactivity. Electrochemical characterizations, including cyclic voltammetry, chronoamperometry, and Pourbaix diagram analysis, confirm the formation of oxidized Ni-rich phases at optimal voltage ranges with peak current exceeding 10 A. The resulting fine NPI powders exhibit a leaching efficiency surpassing 95 % in 2 mol/L sulfuric acid at ambient temperature and pressure, demonstrating their potential as a cost-effective alternative to HPAL. Further post-process evaluations reveal critical electrolysis parameters influencing oxidation behavior and leaching performance, providing key insights for optimizing nickel extraction via anodic electrolysis.http://www.sciencedirect.com/science/article/pii/S1388248125000761NiNickel pig IronElectrolysisElectrochemistryAnodizingLeaching |
| spellingShingle | Namhun Kwon Myungsuk Kim Soongju Oh Jae Hong Shin Kyoung-Tae Park Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching Electrochemistry Communications Ni Nickel pig Iron Electrolysis Electrochemistry Anodizing Leaching |
| title | Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching |
| title_full | Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching |
| title_fullStr | Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching |
| title_full_unstemmed | Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching |
| title_short | Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching |
| title_sort | electrochemical performance and behavior of nickel pig iron anodic electrolysis for enhanced sulfuric acid leaching |
| topic | Ni Nickel pig Iron Electrolysis Electrochemistry Anodizing Leaching |
| url | http://www.sciencedirect.com/science/article/pii/S1388248125000761 |
| work_keys_str_mv | AT namhunkwon electrochemicalperformanceandbehaviorofnickelpigironanodicelectrolysisforenhancedsulfuricacidleaching AT myungsukkim electrochemicalperformanceandbehaviorofnickelpigironanodicelectrolysisforenhancedsulfuricacidleaching AT soongjuoh electrochemicalperformanceandbehaviorofnickelpigironanodicelectrolysisforenhancedsulfuricacidleaching AT jaehongshin electrochemicalperformanceandbehaviorofnickelpigironanodicelectrolysisforenhancedsulfuricacidleaching AT kyoungtaepark electrochemicalperformanceandbehaviorofnickelpigironanodicelectrolysisforenhancedsulfuricacidleaching |