Geochemical signatures of rare earth elements and yttrium exploited by acid solution mining around an ion-adsorption type deposit: Role of source control and potential for recovery
| Autor: | Olivier Pourret, Huaming Guo, Zhanxue Sun, Zebing Li, Haiyan Liu, Maohan Liu, Bai Gao, Weimin Zhang, Zhen Wang, Pierre Laine |
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| Přispěvatelé: | East China University of Science and Technology, China University of Geosciences [Beijing], Agro-écologie, Hydrogéochimie, Milieux et Ressources (AGHYLE), UniLaSalle |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Ammonium sulfate
Environmental Engineering chemistry.chemical_element Fractionation 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Acid mine drainage Lanthanide [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Environmental Chemistry Yttrium Leaching (agriculture) Sulfate Waste Management and Disposal 0105 earth and related environmental sciences Sulfates 010401 analytical chemistry Sediment Water-rock interaction Pollution 6. Clean water 0104 chemical sciences Critical metals chemistry Environmental chemistry Metals Rare Earth Adsorption Groundwater Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Science of the Total Environment Science of the Total Environment, Elsevier, 2022, 804, pp.150241. ⟨10.1016/j.scitotenv.2021.150241⟩ |
| ISSN: | 0048-9697 1879-1026 |
| DOI: | 10.1016/j.scitotenv.2021.150241⟩ |
| Popis: | International audience; Elevated concentrations of rare earth elements and yttrium (REE + Y) in acid mine drainage (AMD) attract worldwide attention. However, the source and control of REE + Y distribution patterns in AMD remain unclear. Water, rock, sediment, and sludge samples were collected from an ion-adsorption deposit site to investigate REE + Y concentrations and distributions. The heavy REE (HREE)-enriched patterns of the AMD resulted from preferential desorption of HREE in the clay-rich sediment strata, from which the REE + Y were ion-exchanged by an in-situ underground leaching process using ammonium sulfate brine. Free ions and sulfate complexes preserved REE + Y patterns and facilitated REE + Y mobility in the AMD leachate system. High concentrations of REE + Y occurred in the AMD, and decreased progressively through nitrification-denitrification and coagulation-precipitation procedures in a water treatment plant. Concentrations of REE + Y were one to three orders of magnitude higher in AMD than those in groundwater, and were negatively correlated (r2 = −0.72) with pH (3.8 to 8.7), suggesting that an acid desorption from minerals contributed the REE + Y to the AMD from the source rock. Normalized REE + Y patterns showed enrichments of HREE over light REE (LREE) and negative Ce anomaly. The distribution patterns were relatively constant for all water samples, despite their huge difference in REE + Y concentrations. This suggested a limited impact of preferential precipitation of LREE over HREE on REE + Y fractionations during neutralization. The potentially recoverable LREE and HREE were calculated to range between 1.12 kg/day and 3.37 kg/day, and between 1.29 kg/day and 3.76 kg/day, respectively. The findings reported in this study lend promise for efficient REE + Y recovery from AMD |
| Databáze: | OpenAIRE |
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