Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C
Because the traditional roasting-leaching-electrowinning zinc hydrometallurgy process has a small sulfuric acid sales radius and a high inventory pressure, the process of direct leaching zinc concentrate is gaining popularity, but the pressurized leaching process is a high-pressure condition, which...
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| Format: | Article |
| Language: | English |
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Technical Faculty, Bor
2022-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2022/1450-53392200016D.pdf |
| _version_ | 1811155237162975232 |
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| author | Deng F.-L. Xu G.-X. Fan W.-W. Li S. Ma R.-X. |
| author_facet | Deng F.-L. Xu G.-X. Fan W.-W. Li S. Ma R.-X. |
| author_sort | Deng F.-L. |
| collection | DOAJ |
| description | Because the traditional roasting-leaching-electrowinning zinc hydrometallurgy process has a small sulfuric acid sales radius and a high inventory pressure, the process of direct leaching zinc concentrate is gaining popularity, but the pressurized leaching process is a high-pressure condition, which requires strict equipment material and high safety requirements. Furthermore, the atmospheric leaching efficiency is low and generally introduces impurities and chloride ions, which increase the cost of subsequent decontamination. Therefore, a new environmentally friendly hydrometallurgy extraction method of zinc was proposed: an atmospheric pressure medium temperature sulfuric acid curing-leaching process. Under open-air conditions, zinc sulfide concentrate was cured with sulfuric acid at different acid-to-ore ratios and heated to 220℃~260℃ for a different time, then the cured product was leached. The effects of temperature, curing time, acid-to-ore ratio, and sulfuric acid concentration on the leaching ratio of zinc (ηZn) were studied. The results demonstrated that ηZn could reach as high as 98.23% under the optimized conditions of temperature 240℃, curing time 2.5 hours, acidto-ore ratio 1.4:1, and sulfuric acid concentration 60 wt.%. The leaching residue ratio is 6%, with silicate accounting for the majority of it. The kinetic results support the shrinking core model, which is controlled by an interface chemical reaction with an apparent activation energy of 43.158 kJ/mol. |
| first_indexed | 2024-04-10T04:29:39Z |
| format | Article |
| id | doaj.art-9d359a1fac8041fd8462f51146ba2317 |
| institution | Directory Open Access Journal |
| issn | 1450-5339 2217-7175 |
| language | English |
| last_indexed | 2024-04-10T04:29:39Z |
| publishDate | 2022-01-01 |
| publisher | Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj.art-9d359a1fac8041fd8462f51146ba23172023-03-10T08:04:39ZengTechnical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752022-01-0158334535310.2298/JMMB220302016D1450-53392200016DAtmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°CDeng F.-L.0Xu G.-X.1Fan W.-W.2Li S.3Ma R.-X.4School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing, PR ChinaSchool of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing, PR ChinaSchool of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing, PR ChinaTianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin, PR ChinaSchool of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing, PR China + Beijing Key Laboratory of Special Melting and Preparation of High-end Metal Materials, Beijing, PR ChinaBecause the traditional roasting-leaching-electrowinning zinc hydrometallurgy process has a small sulfuric acid sales radius and a high inventory pressure, the process of direct leaching zinc concentrate is gaining popularity, but the pressurized leaching process is a high-pressure condition, which requires strict equipment material and high safety requirements. Furthermore, the atmospheric leaching efficiency is low and generally introduces impurities and chloride ions, which increase the cost of subsequent decontamination. Therefore, a new environmentally friendly hydrometallurgy extraction method of zinc was proposed: an atmospheric pressure medium temperature sulfuric acid curing-leaching process. Under open-air conditions, zinc sulfide concentrate was cured with sulfuric acid at different acid-to-ore ratios and heated to 220℃~260℃ for a different time, then the cured product was leached. The effects of temperature, curing time, acid-to-ore ratio, and sulfuric acid concentration on the leaching ratio of zinc (ηZn) were studied. The results demonstrated that ηZn could reach as high as 98.23% under the optimized conditions of temperature 240℃, curing time 2.5 hours, acidto-ore ratio 1.4:1, and sulfuric acid concentration 60 wt.%. The leaching residue ratio is 6%, with silicate accounting for the majority of it. The kinetic results support the shrinking core model, which is controlled by an interface chemical reaction with an apparent activation energy of 43.158 kJ/mol.http://www.doiserbia.nb.rs/img/doi/1450-5339/2022/1450-53392200016D.pdfzinc sulfide concentrateatmospheric curingkineticsshrinking core model |
| spellingShingle | Deng F.-L. Xu G.-X. Fan W.-W. Li S. Ma R.-X. Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C Journal of Mining and Metallurgy. Section B: Metallurgy zinc sulfide concentrate atmospheric curing kinetics shrinking core model |
| title | Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C |
| title_full | Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C |
| title_fullStr | Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C |
| title_full_unstemmed | Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C |
| title_short | Atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°C |
| title_sort | atmospheric curing of zinc sulfide concentrate by sulfuric acid below 300°c |
| topic | zinc sulfide concentrate atmospheric curing kinetics shrinking core model |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2022/1450-53392200016D.pdf |
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