Advances in carboxylate collectors adsorption on monazite surface: Part 1 – Assessment of the hydroxylation and carbonation of surface lanthanide ions
| Autor: | Lev Filippov, Anthony Geneyton, Nour-Eddine Menad, A. Renard, M. Mallet |
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| Přispěvatelé: | Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), GeoRessources, Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Institut national des sciences de l'Univers (INSU - CNRS), National University of Science and Technology (MISIS), Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
RARE-EARTH-ELEMENTS
Lanthanide Carbonation Inorganic chemistry General Physics and Astronomy Infrared spectroscopy FLOTATION BEHAVIOR 02 engineering and technology Hydroxylation 010402 general chemistry 01 natural sciences Chemical reaction HYDROXIDE COMPLEXES chemistry.chemical_compound Thermodynamic Adsorption Lanthanides Surface speciation XPS Molecule Monazite Carboxylate SPECIATION [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology OXIDE Rare-earth minerals Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics HYDROLYSIS 0104 chemical sciences Surfaces Coatings and Films chemistry ACID NEODYMIUM(III) Carbonate LA 0210 nano-technology |
| Zdroj: | Applied Surface Science Applied Surface Science, Elsevier, 2019, 485, pp.283-292. ⟨10.1016/j.apsusc.2019.04.017⟩ |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.04.017 |
| Popis: | International audience; The adsorption of carboxylate collectors is largely assumed to be affected by the monazite surface speciation. In order to provide key information for the understanding of this phenomenon, we propose in this study a thermodynamic model for the equilibrium of monazite-(La) crystal in an H2O-CO2 system. This model allows access to the speciation information of the dissolved lattice species. Based on this model, we identify potential chemical reactions that may affect, under certain conditions, lanthanide ions on monazite surface. Since these surface ions have vacant coordination sites, they may react with water molecules and media species to restore their coordination shells. Therefore, it has been suggested that surface lanthanide ions undergo hydroxylation and carbonation reactions under alkaline conditions. X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy were used to analyse synthetic monazite-(La) samples treated in deionised water or sodium carbonate solutions. The spectroscopy results suggest that surface lanthanide ions do tend to hydroxylate under alkaline conditions. Furthermore, under the tested conditions, no significant monazite surface carbonation was observed. These results indicate that surface lanthanide ions have limited affinity for dissolved carbonate species, contrary to what is suggested by the thermodynamic model for free lanthanide ions in the bulk. |
| Databáze: | OpenAIRE |
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