Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals
The effect of biodegradable chelating agents on the recovery of rare earth elements (REE) from clay minerals via ion-exchange leaching was investigated, with the aim of proposing a cost-effective, enhanced procedure that is environmentally benign and allows high REE recovery while reducing/eliminati...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/8/1265 |
| _version_ | 1797522946970877952 |
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| author | Georgiana Moldoveanu Vladimiros Papangelakis |
| author_facet | Georgiana Moldoveanu Vladimiros Papangelakis |
| author_sort | Georgiana Moldoveanu |
| collection | DOAJ |
| description | The effect of biodegradable chelating agents on the recovery of rare earth elements (REE) from clay minerals via ion-exchange leaching was investigated, with the aim of proposing a cost-effective, enhanced procedure that is environmentally benign and allows high REE recovery while reducing/eliminating ammonium sulfate usage. A processing route employing a lixiviant system consisting of simulated sea water (equivalent to about 0.5 mol/L NaCl) in conjunction with chelating agents was also explored, in order to offer a process alternative for situations with restricted access to fresh water (either due to remote location or to lower the operating costs). Screening criteria for the selection of chelating agents were established and experiments were conducted to assess the efficiency of selected reagents in terms of REE recovery. The results were compared to extraction levels obtained during conventional ion-exchange leaching procedures with ammonium sulfate and simulated sea water only. It was found that stoichiometric addition of <i>N</i>,<i>N</i>′-ethylenediaminedisuccinic acid (EDDS) and nitrilotriacetic acid-trisodium form (NTA-Na<sub>3</sub>) resulted in 10–20% increased REE extraction when compared to lixiviant only, while achieving moderate Al co-desorption and maintaining neutral pH values in the final solution. |
| first_indexed | 2024-03-10T08:36:32Z |
| format | Article |
| id | doaj.art-d9c0f42967bf49fe97fee4a81ff33851 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T08:36:32Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-d9c0f42967bf49fe97fee4a81ff338512023-11-22T08:42:01ZengMDPI AGMetals2075-47012021-08-01118126510.3390/met11081265Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay MineralsGeorgiana Moldoveanu0Vladimiros Papangelakis1Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, CanadaDepartment of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, CanadaThe effect of biodegradable chelating agents on the recovery of rare earth elements (REE) from clay minerals via ion-exchange leaching was investigated, with the aim of proposing a cost-effective, enhanced procedure that is environmentally benign and allows high REE recovery while reducing/eliminating ammonium sulfate usage. A processing route employing a lixiviant system consisting of simulated sea water (equivalent to about 0.5 mol/L NaCl) in conjunction with chelating agents was also explored, in order to offer a process alternative for situations with restricted access to fresh water (either due to remote location or to lower the operating costs). Screening criteria for the selection of chelating agents were established and experiments were conducted to assess the efficiency of selected reagents in terms of REE recovery. The results were compared to extraction levels obtained during conventional ion-exchange leaching procedures with ammonium sulfate and simulated sea water only. It was found that stoichiometric addition of <i>N</i>,<i>N</i>′-ethylenediaminedisuccinic acid (EDDS) and nitrilotriacetic acid-trisodium form (NTA-Na<sub>3</sub>) resulted in 10–20% increased REE extraction when compared to lixiviant only, while achieving moderate Al co-desorption and maintaining neutral pH values in the final solution.https://www.mdpi.com/2075-4701/11/8/1265weathered crust elution-deposited rare earth orerare earth recoveryion-exchange leachingchelationchelating agentspolydentate ligands |
| spellingShingle | Georgiana Moldoveanu Vladimiros Papangelakis Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals Metals weathered crust elution-deposited rare earth ore rare earth recovery ion-exchange leaching chelation chelating agents polydentate ligands |
| title | Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals |
| title_full | Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals |
| title_fullStr | Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals |
| title_full_unstemmed | Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals |
| title_short | Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals |
| title_sort | chelation assisted ion exchange leaching of rare earths from clay minerals |
| topic | weathered crust elution-deposited rare earth ore rare earth recovery ion-exchange leaching chelation chelating agents polydentate ligands |
| url | https://www.mdpi.com/2075-4701/11/8/1265 |
| work_keys_str_mv | AT georgianamoldoveanu chelationassistedionexchangeleachingofrareearthsfromclayminerals AT vladimirospapangelakis chelationassistedionexchangeleachingofrareearthsfromclayminerals |