Reduction of Fe and Ni in Fe-Ni-O systems
A Cu-Co ore from Katinga Province, the Republic of Congo containing 1.5% Co and 1.6% Cu was tested to determine the leachability of Cu and Co using sulphuric acid and hydrogen peroxide mixtures at different conditions. Without hydrogen peroxide, the maximum extraction of copper and cobalt were f...
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University of Belgrade, Technical Faculty, Bor
2013-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391200038Z.pdf |
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| author | Zhang Y. Wei W. Yang X. Wei F. |
| author_facet | Zhang Y. Wei W. Yang X. Wei F. |
| author_sort | Zhang Y. |
| collection | DOAJ |
| description | A Cu-Co ore from Katinga Province, the Republic of Congo containing 1.5% Co and 1.6% Cu was tested to determine the leachability of Cu and Co using sulphuric acid and hydrogen peroxide mixtures at different conditions. Without hydrogen peroxide, the maximum extraction of copper and cobalt were found to be ~80% and ~15%, respectively when the acid concentration was varied between 0.36 - 1.1M. When hydrogen peroxide was added (0.008-0.042M), Cu recovery was enhanced to ~90%. Recoveries of ~90% of Co could be achieved at 20ºC, using leachants consisting of 0.36M sulphuric acid and 0.025M hydrogen peroxide after 3 hours. The reaction time to reach 90% Co extraction was reduced to less than 2 hours at 30ºC. Stabcal modelling of the Eh-pH diagrams shows the importance of hydrogen peroxide as a reductant. The decrease of solution potential (300-350 mV) by adding hydrogen peroxide was confirmed by Eh measurements during the tests. The leaching follows the shrinking core model kinetics, where the rate constant is linearly dependent on hydrogen peroxide concentration in the range 0-0.025M and proportional to (1/r2) where r is the average radius of the mineral particles. The activation energy for the leaching process is 72.3 kJ/mol. |
| format | Article |
| id | doaj-art-919d6effbf054f039d5bdf51a3f57ad2 |
| institution | Kabale University |
| issn | 1450-5339 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-919d6effbf054f039d5bdf51a3f57ad22025-02-02T01:30:14ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392013-01-01491132010.2298/JMMB120208038ZReduction of Fe and Ni in Fe-Ni-O systemsZhang Y.Wei W.Yang X.Wei F.A Cu-Co ore from Katinga Province, the Republic of Congo containing 1.5% Co and 1.6% Cu was tested to determine the leachability of Cu and Co using sulphuric acid and hydrogen peroxide mixtures at different conditions. Without hydrogen peroxide, the maximum extraction of copper and cobalt were found to be ~80% and ~15%, respectively when the acid concentration was varied between 0.36 - 1.1M. When hydrogen peroxide was added (0.008-0.042M), Cu recovery was enhanced to ~90%. Recoveries of ~90% of Co could be achieved at 20ºC, using leachants consisting of 0.36M sulphuric acid and 0.025M hydrogen peroxide after 3 hours. The reaction time to reach 90% Co extraction was reduced to less than 2 hours at 30ºC. Stabcal modelling of the Eh-pH diagrams shows the importance of hydrogen peroxide as a reductant. The decrease of solution potential (300-350 mV) by adding hydrogen peroxide was confirmed by Eh measurements during the tests. The leaching follows the shrinking core model kinetics, where the rate constant is linearly dependent on hydrogen peroxide concentration in the range 0-0.025M and proportional to (1/r2) where r is the average radius of the mineral particles. The activation energy for the leaching process is 72.3 kJ/mol.http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391200038Z.pdfCu-Co oresleachingsulphuric acidhydrogen peroxideshrinking-core modelstabcal modeling |
| spellingShingle | Zhang Y. Wei W. Yang X. Wei F. Reduction of Fe and Ni in Fe-Ni-O systems Journal of Mining and Metallurgy. Section B: Metallurgy Cu-Co ores leaching sulphuric acid hydrogen peroxide shrinking-core model stabcal modeling |
| title | Reduction of Fe and Ni in Fe-Ni-O systems |
| title_full | Reduction of Fe and Ni in Fe-Ni-O systems |
| title_fullStr | Reduction of Fe and Ni in Fe-Ni-O systems |
| title_full_unstemmed | Reduction of Fe and Ni in Fe-Ni-O systems |
| title_short | Reduction of Fe and Ni in Fe-Ni-O systems |
| title_sort | reduction of fe and ni in fe ni o systems |
| topic | Cu-Co ores leaching sulphuric acid hydrogen peroxide shrinking-core model stabcal modeling |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391200038Z.pdf |
| work_keys_str_mv | AT zhangy reductionoffeandniinfeniosystems AT weiw reductionoffeandniinfeniosystems AT yangx reductionoffeandniinfeniosystems AT weif reductionoffeandniinfeniosystems |