Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst
This article presents studies on the recovery of cobalt from a spent cobalt oxide catalyst, left after the preparation of industrial catalysts. Apart from cobalt, the tested material contained iron, copper, zinc, and nickel. Leaching was proposed as a simple and feasible operation to treat the spent...
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| Format: | Article |
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MDPI AG
2023-05-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/13/6/952 |
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| author | Dominika Małolepsza Martyna Rzelewska-Piekut Magdalena Emmons-Burzyńska Magdalena Regel-Rosocka |
| author_facet | Dominika Małolepsza Martyna Rzelewska-Piekut Magdalena Emmons-Burzyńska Magdalena Regel-Rosocka |
| author_sort | Dominika Małolepsza |
| collection | DOAJ |
| description | This article presents studies on the recovery of cobalt from a spent cobalt oxide catalyst, left after the preparation of industrial catalysts. Apart from cobalt, the tested material contained iron, copper, zinc, and nickel. Leaching was proposed as a simple and feasible operation to treat the spent cobalt oxide. The 0.1–8.0 M H<sub>2</sub>SO<sub>4</sub> solutions were applied as leaching agents at an ambient temperature and at 70 °C. An 8.0 M H<sub>2</sub>SO<sub>4</sub> solution at 70 °C leached two-fold more Co(II) than a 0.1 M H<sub>2</sub>SO<sub>4</sub> solution at the same temperature. Similar to Co(II), regardless of the leaching temperature, the Fe ion was leached more efficiently with 4.0 or 8.0 M H<sub>2</sub>SO<sub>4</sub> than with a 0.1 M acid. It should be emphasized that the Co(II) content in the solution after leaching was predominant at >90% (~4800 mg/dm<sup>3</sup>), compared to other metal ions. The ANOVA analysis indicated that both the sulfuric(VI) acid concentration and temperature had a significant effect on the leaching efficiency. An increase in acid concentration from 0.1 to 8 M and the temperature of leaching (from ambient to 70 °C) had a positive effect on the Co leaching efficiency (an increase from ~20 to almost 50%). The proposed hydrometallurgical treatment of the spent cobalt oxide catalyst is a response to the waste-to-resource (WTR) approach. |
| first_indexed | 2024-03-11T02:39:53Z |
| format | Article |
| id | doaj.art-93c8b83261c243be9ee0cd5681fb24a0 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-11T02:39:53Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-93c8b83261c243be9ee0cd5681fb24a02023-11-18T09:41:40ZengMDPI AGCatalysts2073-43442023-05-0113695210.3390/catal13060952Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide CatalystDominika Małolepsza0Martyna Rzelewska-Piekut1Magdalena Emmons-Burzyńska2Magdalena Regel-Rosocka3Institute of Chemical Technology and Engineering, Poznan University of Technology, ul. Berdychowo 4, 60-965 Poznań, PolandInstitute of Chemical Technology and Engineering, Poznan University of Technology, ul. Berdychowo 4, 60-965 Poznań, PolandInstitute of Chemical Technology and Engineering, Poznan University of Technology, ul. Berdychowo 4, 60-965 Poznań, PolandInstitute of Chemical Technology and Engineering, Poznan University of Technology, ul. Berdychowo 4, 60-965 Poznań, PolandThis article presents studies on the recovery of cobalt from a spent cobalt oxide catalyst, left after the preparation of industrial catalysts. Apart from cobalt, the tested material contained iron, copper, zinc, and nickel. Leaching was proposed as a simple and feasible operation to treat the spent cobalt oxide. The 0.1–8.0 M H<sub>2</sub>SO<sub>4</sub> solutions were applied as leaching agents at an ambient temperature and at 70 °C. An 8.0 M H<sub>2</sub>SO<sub>4</sub> solution at 70 °C leached two-fold more Co(II) than a 0.1 M H<sub>2</sub>SO<sub>4</sub> solution at the same temperature. Similar to Co(II), regardless of the leaching temperature, the Fe ion was leached more efficiently with 4.0 or 8.0 M H<sub>2</sub>SO<sub>4</sub> than with a 0.1 M acid. It should be emphasized that the Co(II) content in the solution after leaching was predominant at >90% (~4800 mg/dm<sup>3</sup>), compared to other metal ions. The ANOVA analysis indicated that both the sulfuric(VI) acid concentration and temperature had a significant effect on the leaching efficiency. An increase in acid concentration from 0.1 to 8 M and the temperature of leaching (from ambient to 70 °C) had a positive effect on the Co leaching efficiency (an increase from ~20 to almost 50%). The proposed hydrometallurgical treatment of the spent cobalt oxide catalyst is a response to the waste-to-resource (WTR) approach.https://www.mdpi.com/2073-4344/13/6/952waste-to-resource (WTR)cobalt recoveryleachinghydrometallurgyspent industrial catalystcobalt oxide |
| spellingShingle | Dominika Małolepsza Martyna Rzelewska-Piekut Magdalena Emmons-Burzyńska Magdalena Regel-Rosocka Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst Catalysts waste-to-resource (WTR) cobalt recovery leaching hydrometallurgy spent industrial catalyst cobalt oxide |
| title | Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst |
| title_full | Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst |
| title_fullStr | Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst |
| title_full_unstemmed | Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst |
| title_short | Waste-to-Resources: Leaching of Cobalt from Spent Cobalt Oxide Catalyst |
| title_sort | waste to resources leaching of cobalt from spent cobalt oxide catalyst |
| topic | waste-to-resource (WTR) cobalt recovery leaching hydrometallurgy spent industrial catalyst cobalt oxide |
| url | https://www.mdpi.com/2073-4344/13/6/952 |
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