Bibliographic Details
| Title: |
Leaching Efficacy of Ethylenediaminetetraacetic Acid (EDTA) to Extract Rare-Earth Elements from Monazite Concentrate |
| Authors: |
Ammar S. A. Al Sheidi, Laurence G. Dyer, Bogale Tadesse |
| Source: |
Crystals, Vol 14, Iss 10, p 829 (2024) |
| Publisher Information: |
MDPI AG, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Crystallography |
| Subject Terms: |
rare-earth elements, leaching, EDTA, oxalate, Crystallography, QD901-999 |
| More Details: |
Alkaline EDTA solution has been previously identified as an effective leaching agent for solubilising rare-earth oxalates. These oxalates are the product of an oxalic acid conversion leach dissolving monazite and redepositing the salt. Pervious work suggested a significant increase in recovery was observed between pH 8 and 10; we have demonstrated that, in an excess of EDTA, this is not the case, and the dissolution is similar. While demonstrating that, at a nominal solid loading of 100 g/L, 0.2 M EDTA solution produced the highest dissolution, elevated solids require an equivalent increase in lixiviant concentration driven by consumption. Very-high-solution concentrations (>50 g/L dissolved TREEs) were achieved at a high solid loading, indicating both that a solution equilibrium is yet to be reached and that a build-up of oxalate in the system (estimated at ~1 M) does not impact the leach efficiency. We have also demonstrated the recycling of EDTA to use in multiple stages as well as the ability to recover oxalate from this solution. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2073-4352 |
| Relation: |
https://www.mdpi.com/2073-4352/14/10/829; https://doaj.org/toc/2073-4352 |
| DOI: |
10.3390/cryst14100829 |
| Access URL: |
https://doaj.org/article/3e0ba4a8d1054d0fb219d74bd1dd2aa4 |
| Accession Number: |
edsdoj.3e0ba4a8d1054d0fb219d74bd1dd2aa4 |
| Database: |
Directory of Open Access Journals |
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