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Chemical environment of cold seep carbonate formation on the northern continental slope of South China Sea: Evidence from trace and rare earth element geochemistry KU Leuven
Trace element and rare earth element (REE) concentrations in cold seep carbonates from the northern continental slope of the South China Sea are used in this study to indicate source fluid characteristics and redox conditions. Carbonate samples from the two study areas (Shenhu and Dongsha) all show low total REE concentrations (mostly 10–20 ppm). In the Shenhu area, the shale-normalized REE patterns of the chimney carbonates display slight light ...
Innovative Technologies for Rare Earth Element Recovery from Bauxite Residue KU Leuven
Red mud (also called bauxite residue) is a solid waste formed during the production of alumina in the Bayer process. It has been estimated that about 140-150 million tonnes of bauxite residue are generated every year and, approximately 3-4 billion tonnes of this material have been already stockpiled during the last decades. The disposal and long-term storage of such material occupy large extension of land, which results in major costs and ...
Life Cycle Assessment of new recycling and reuse routes for Rare Earth Element machines in hybrid/electric vehicles KU Leuven
Hybrid and Full Electric Vehicles (H)EVs are essential for the transition towards sustainable e-mobility. The permanent magnets in motors/generators of (H)EVs contain large quantities of rare earths, which are critical metals with the highest supply risk for Europe. As highlighted by the European Rare Earths Competency Network, recycling of rare-earth magnets from (H)EVs should receive top priority. Reclaiming of rare-earth magnet ...
Highly sensitive nondestructive rare earth element detection by means of wavelength-dispersive X-ray fluorescence spectroscopy enabled by an energy dispersive pn-charge-coupled-device detector Universiteit Gent
Detection of rare earth elements (REE) is commonly performed with destructive techniques such as (LA)-ICPMS or coupled to a destructive sample preparation. When investigating unique geological samples, such as cometary, asteroidal, or interstellar material from sample return missions or inclusions in deep Earth diamonds, a nondestructive method is preferred. The presented nondestructive highly sensitive wavelength-dispersive X-ray fluorescence ...
Selective rare earth element extraction using high-pressure acid leaching of slags arising from the smelting of bauxite residue KU Leuven
© 2019 Elsevier B.V. During acid leaching of bauxite residue (red mud), the increase in dissolution of rare-earth elements (REEs) is associated with a substantial co-dissolution of iron; this poses problems in the downstream processing (i.e. solvent extraction or ion exchange). Six different slags generated by reductive smelting of the same bauxite residue sample were treated by high-pressure acid leaching (HPAL) with HCl and H 2 SO 4 to ...
Alkali metal and rare earth element evolution of rock-forming minerals from the Gatumba area pegmatites (Rwanda): Quantitative assessment of crystal-melt fractionation in the regional zonation of pegmatite groups KU Leuven Universiteit Gent
This study presents a general model for the evaluation of Rayleigh fractional crystallisation as the principal differentiation mechanism in the formation of regionally zoned common and rare-element pegmatites. The magmatic evolution of these systems from a granitic source is reconstructed by means of alkali element and rare earth element (REE) analyses of rock-forming minerals (feldspars, micas and tourmaline), which represent a whole sequence ...
Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission Universiteit Gent
Conceptualizing Rare Earth Element Mass Transfer in Hydrothermal Mineral Systems KU Leuven
Rare earth element and yttrium (REEY) signatures in hydrothermal gangue carbonates are among the most widely used proxies for studying hydrothermal mineralization. The observed patterns essentially provide information on REEY fractionating processes operating along the trajectory of the hydro-thermal fluid. This study adopts a source-sink approach to synthesize the current understanding of REEY mass transfer in aqueous hydrothermal fluids. REEY ...
Rare earth element and yttrium characteristics of carbonates within the sediment-hosted Luiswishi and Kamoto Cu-Co deposits, Katanga Copperbelt (Democratic Republic of Congo ‒ DRC) KU Leuven Universiteit Gent
The Neoproterozoic Central African Copperbelt is a world-class metallogenic province characterized by sediment-hosted stratiform Cu-Co ore deposits and polymetallic vein-type deposits. Two main mineralization phases have been recognized in the Katanga Copperbelt (Democratic Republic of Congo). The first phase occurred during early to intermediate diagenesis and the second during deep burial and the Lufilian orogeny. The Rare Earth Element and ...