Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals
| Autor: | Georgiana A. Moldoveanu, Vladimiros G. Papangelakis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Lixiviant
Ammonium sulfate Mining engineering. Metallurgy ion-exchange leaching Ion exchange Chemistry Inorganic chemistry Extraction (chemistry) Metals and Alloys TN1-997 rare earth recovery weathered crust elution-deposited rare earth ore chemistry.chemical_compound EDDS chelation chelating agents polydentate ligands General Materials Science Chelation Leaching (metallurgy) Clay minerals |
| Zdroj: | Metals Volume 11 Issue 8 Metals, Vol 11, Iss 1265, p 1265 (2021) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met11081265 |
| Popis: | 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 N,N′-ethylenediaminedisuccinic acid (EDDS) and nitrilotriacetic acid-trisodium form (NTA-Na3) 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|