Leaching of hemimorphite in neutral solution at high temperature
The leaching behavior of hemimorphite in neutral solution (NH4 +-Cl--H2O) was investigated at high temperature (T > 100°C) under a range of experimental conditions. Thermodynamic calculations indicate that the tendency of dehydration of silica gel is significantly enhanced with the increasing tem...
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| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2020-01-01
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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/1450-5339/2020/1450-53392000014Z.pdf |
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| author | Zhao D.-Q. Yang S.-H. Chen Y.-M. Tang C.-B He J. Li H. |
| author_facet | Zhao D.-Q. Yang S.-H. Chen Y.-M. Tang C.-B He J. Li H. |
| author_sort | Zhao D.-Q. |
| collection | DOAJ |
| description | The leaching behavior of hemimorphite in neutral solution (NH4 +-Cl--H2O) was investigated at high temperature (T > 100°C) under a range of experimental conditions. Thermodynamic calculations indicate that the tendency of dehydration of silica gel is significantly enhanced with the increasing temperature. It was shown that the temperature, ammonium chloride concentration, or L/S ratio increased resulted in greater leaching efficiency. The following optimized leaching conditions were obtained: stirrer speed 400r/min, NH4Cl concentration 5.5M, L/S ratio 9mL/g at 160°C for 3h. Under these optimized conditions, the average leaching yield of zinc was 97.82%. The silicon was converted to quartz and remained in the residue. This process can be used to dispose willemite and hemimorphite as it solves the problem of silica gel dehydration. |
| format | Article |
| id | doaj-art-6399a412e9894f79854b390c5069770a |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-6399a412e9894f79854b390c5069770a2025-02-02T06:57:43ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752020-01-0156220320810.2298/JMMB191016014Z1450-53392000014ZLeaching of hemimorphite in neutral solution at high temperatureZhao D.-Q.0Yang S.-H.1Chen Y.-M.2Tang C.-B3He J.4Li H.5School of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, ChinaSchool of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, ChinaSchool of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, ChinaSchool of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, ChinaSchool of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, ChinaSchool of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, ChinaThe leaching behavior of hemimorphite in neutral solution (NH4 +-Cl--H2O) was investigated at high temperature (T > 100°C) under a range of experimental conditions. Thermodynamic calculations indicate that the tendency of dehydration of silica gel is significantly enhanced with the increasing temperature. It was shown that the temperature, ammonium chloride concentration, or L/S ratio increased resulted in greater leaching efficiency. The following optimized leaching conditions were obtained: stirrer speed 400r/min, NH4Cl concentration 5.5M, L/S ratio 9mL/g at 160°C for 3h. Under these optimized conditions, the average leaching yield of zinc was 97.82%. The silicon was converted to quartz and remained in the residue. This process can be used to dispose willemite and hemimorphite as it solves the problem of silica gel dehydration.http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000014Z.pdfpressure leachingammonium chloridehemimorphitesilica gel |
| spellingShingle | Zhao D.-Q. Yang S.-H. Chen Y.-M. Tang C.-B He J. Li H. Leaching of hemimorphite in neutral solution at high temperature Journal of Mining and Metallurgy. Section B: Metallurgy pressure leaching ammonium chloride hemimorphite silica gel |
| title | Leaching of hemimorphite in neutral solution at high temperature |
| title_full | Leaching of hemimorphite in neutral solution at high temperature |
| title_fullStr | Leaching of hemimorphite in neutral solution at high temperature |
| title_full_unstemmed | Leaching of hemimorphite in neutral solution at high temperature |
| title_short | Leaching of hemimorphite in neutral solution at high temperature |
| title_sort | leaching of hemimorphite in neutral solution at high temperature |
| topic | pressure leaching ammonium chloride hemimorphite silica gel |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000014Z.pdf |
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