Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution
Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of...
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| Format: | Article |
| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2012-01-01
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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/1450-5339/2012/1450-53391200022S.pdf |
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| author | Sokić M. Marković B. Matković V. Živković D. Štrbac N. Stojanović J. |
| author_facet | Sokić M. Marković B. Matković V. Živković D. Štrbac N. Stojanović J. |
| author_sort | Sokić M. |
| collection | DOAJ |
| description | Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of sphalerite leaching from complex sulphide concentrate with sulphuric acid and sodium nitrate solution at standard conditions was presented in this paper. The influences of temperature and time on the leaching degree of zinc were investigated and kinetic analysis of the process was accomplished. With temperature increasing from 60 to 90°C, the zinc leaching increased from 25.23% to 71.66% after 2 hours, i.e. from 59.40% to 99.83% after 4 hours. The selected kinetic model indicated that the diffusion through the product layer was the rate-controlling step during the sphalerite leaching. The activation energy was determined to be 55 kJ/mol in the temperature range 60-90°C. XRD, light microscopy and SEM/EDX analyses of the complex concentrate and leach residue confirmed formation of elemental sulphur and diffusion-controlled leaching mechanism. |
| format | Article |
| id | doaj-art-1623670e31b447488ba1e8ddc0a70f16 |
| institution | Kabale University |
| issn | 1450-5339 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-1623670e31b447488ba1e8ddc0a70f162025-02-02T05:31:37ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392012-01-0148218519510.2298/JMMB111130022SKinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solutionSokić M.Marković B.Matković V.Živković D.Štrbac N.Stojanović J.Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of sphalerite leaching from complex sulphide concentrate with sulphuric acid and sodium nitrate solution at standard conditions was presented in this paper. The influences of temperature and time on the leaching degree of zinc were investigated and kinetic analysis of the process was accomplished. With temperature increasing from 60 to 90°C, the zinc leaching increased from 25.23% to 71.66% after 2 hours, i.e. from 59.40% to 99.83% after 4 hours. The selected kinetic model indicated that the diffusion through the product layer was the rate-controlling step during the sphalerite leaching. The activation energy was determined to be 55 kJ/mol in the temperature range 60-90°C. XRD, light microscopy and SEM/EDX analyses of the complex concentrate and leach residue confirmed formation of elemental sulphur and diffusion-controlled leaching mechanism.http://www.doiserbia.nb.rs/img/doi/1450-5339/2012/1450-53391200022S.pdfsphalerite leachingsodium nitratesulphuric acidkineticsmechanism |
| spellingShingle | Sokić M. Marković B. Matković V. Živković D. Štrbac N. Stojanović J. Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution Journal of Mining and Metallurgy. Section B: Metallurgy sphalerite leaching sodium nitrate sulphuric acid kinetics mechanism |
| title | Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution |
| title_full | Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution |
| title_fullStr | Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution |
| title_full_unstemmed | Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution |
| title_short | Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution |
| title_sort | kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution |
| topic | sphalerite leaching sodium nitrate sulphuric acid kinetics mechanism |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2012/1450-53391200022S.pdf |
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