Effect of rare earth ions on regular of nitride migration in …
In order to reveal the migration law of microfine particles during in situ leaching of ionic rare earth ores and to find suitable regulation methods, this paper investigates the effects of ...
Migration of rare earth elements in the topsoil of …
The migration of rare earth elements after simulated rainfall in the topsoil corresponds to other studies that focus on their accumulation and translocation activities . Rare earth elements properties in the soil and absorption capacity are the main factors affecting the migration activities . The TREE in the soil of each location, after ...
Long-range migration behavior of rare earth additives in …
The long-range migration phenomena of RE were incidentally discovered in carbon-deficient WC–Co alloys with WC + β + η structure by Li Zhang and Wolf-Dieter Schubert in 2002, where β is a cobalt-based binder phase and η is a carbon-deficient phase with a composition of Co x W y C. It was initially reported in 2003 [3].
Rare earth element migration and impact of …
The migration of rare earth elements (REEs) has a major influence on the environment. However, little is known about REEs migration control by Dicranopteris dichotoma at …
Effects of in situ leaching on the origin and …
Abstract. In situ leaching of ion-adsorption rare earth element (REE) deposits has released large amounts of REE-containing wastewater. However, the origin, speciation, distribution and migration of REEs in aqueous systems of the mining …
Patterns of Slope Runoff and Sediment Yield and Rare Earth Migration
Rare earth elements (REE) were used to study the temporal and spatial processes of soil erosion from different depths and sections of a slope. Two simulated rainfall events were applied to a ...
Energy Migration Engineering of Bright Rare-Earth …
A novel Nd(3+) -sensitized upconversion nanoparticle (UCNP) that can be excited by near-infrared 740 nm light-emitting diode (LED) lamps with bright upconversion luminescence is designed. Yb(3+) ion distribution is engineered to increase the energy migration efficiency. The benefit of the novel LED- …
Rare earth elements in the upland soils of northern China: …
1. Introduction. Rare earth elements (REEs) include 15 lanthanide elements, from lanthanum to lutetium, scandium, and yttrium (Mihajlovic and Rinklebe, 2018).REEs share similar physicochemical properties and usually exist together in environmental matrices rather than in isolation (Li et al., 2013; Godwyn-Paulson et al., 2022).REEs are …
Rare earth element migration and impact of Dicranopteris …
The migration of rare earth elements (REEs) has a major influence on the environment. However, little is known about REEs migration control by Dicranopteris dichotoma at REEs mines.
Geochemical characteristics and migration patterns …
Geochemical characteristics and migration patterns of rare earth elements in coal mining subsidence lakes under the influence of multiple factors - ScienceDirect. …
Organic-mineral colloids regulate the migration and
Ion-adsorption rare earth element (REE) deposits distributed in the subtropics provide a rich global source of REEs, but in situ injection of REEs extractant into the mine can result in leachate being leaked into the surrounding groundwater systems. Due to the lack of understanding of REE speciation distribution, particularly colloidal characteristics …
(PDF) Migration of rare earth elements in the topsoil of …
ties, rare earth elements migrate to the lower slope. And . Ce enriched during the leaching process through converting . from Ce 3+ into Ce 4+ by oxidation and formed precipitation,
Native point defects and oxygen migration of rare earth …
Various excellent properties of rare earth zirconate and stannate pyrochlores are close related with their native point defects. First-principles calculations are performed to systematically investigate the point defect mechanism and the oxygen diffusion behavior of A 2 B 2 O 7 (A=La, Ce, Pr, Nd, Pm, Sm, Eu, Gd; B=Zr, Sn). The …
Rare earth element transport and mineralization linked to …
We argue that fluid CO 2 contents are essential to preclude or slow down the interaction with wall rock during migration and that fluid-mediated rare earth element …
First-principles study on defect chemistry and migration of …
Oxygen transport in rare-earth oxide (RE(2)O(3)) doped CeO(2) with fluorite structure has attracted considerable attention owing to both the range of practical usage (e.g., fuel cells, sensors, etc.) and the fundamental fascination of fast oxide ion transport in crystalline solids. Using density-fun …
Rare earth element migration and impact of Dicranopteris …
DOI: 10.1016/J.CHEMOSPHERE.2021.130433 Corpus ID: 233853876; Rare earth element migration and impact of Dicranopteris dichotoma at mines in south China. @article{Chen2021RareEE, title={Rare earth element migration and impact of Dicranopteris dichotoma at mines in south China.}, author={Zhi-qiang Chen and Zhi-biao …
Oil–Source Correlation and Secondary Migration Paths …
migration paths of Chang 10 oil were determined by applying carbazole parameters. The secondary migration path of oil shows that the Zhidan area's eastern part is the preferential oil accumulation area. KEY WORDS: Biomarkers, Rare earth elements (REEs), Carbazoles, Oil–source correlation, Secondary oil migration paths, Ordos Basin. …
Changes in Microfine Particle Migration of Ionic Rare …
The results showed that the migration of microfine particles during ionic rare earth ore leaching was an important factor affecting leaching efficiency. Under the action of external forces, the ...
The effect of diagenesis and fluid migration on rare earth …
Analytical challenges in obtaining high quality measurements of rare earth elements (REEs) from small pore fluid volumes have limited the application of REEs as deep fluid geochemical tracers. ... However, a comparison of fluid compositions from a variety of hydrothermal solutions showed that fluid migration through different rock types …
Oil–Source Correlation and Secondary Migration Paths in
The secondary migration path of oil shows that the Zhidan area's eastern part is the preferential oil accumulation area. ... McLennan, S. M. (1989). Rare earth elements in sedimentary rocks; influence of provenance and sedimentary processes. Reviews in Mineralogy and Geochemistry, 21(1), 169–200.
Simulation of Heavy Metals Migration in Soil of Rare Earth …
Simulation of Heavy Metals Migration in Soil of Rare Earth Mining Area. January 2022. DOI: 10.3808/jeil.202200094. Authors: Y. F. Luo. Z. Wang. C. L. Zheng. To read the full-text of this research ...
Migration of ammonium nitrogen in ion-absorbed …
Migration of ammonium nitrogen in ion-absorbed rare earth soils during and post in situ mining: a column study and numerical simulation analysis. Research …
Effects of in situ leaching on the origin and migration of rare earth …
The exploration of REE origin and migration in aqueous systems of mine sites would thus facilitate the understanding of REE detrimental effect on the environment. In aqueous systems, the bio-geochemical behavior including toxicity and migration of REEs largely depends on their speciation (Liu et al., 2016). ... Rare Earth Elements …
Native point defects and oxygen migration of rare earth …
Various excellent properties of rare earth zirconate and stannate pyrochlores are close related with their native point defects.First-principles calculations are performed to systematically investigate the point defect mechanism and the oxygen diffusion behavior of A 2 B 2 O 7 (A=La, Ce, Pr, Nd, Pm, Sm, Eu, Gd; B =Zr, Sn). The …
A first-principles study of the proton and oxygen migration …
For reorientation, the migration barrier for a proton from H1 to H2 is predicted to be 0.25 eV. Meanwhile, for the reverse direction, the barrier is calculated to be 0.47 eV due to the different energies of formation of these two defects. For intraoctahedral migration, the migration barrier for a proton from H1 to H2 is estimated to be 0.03 eV.
The effects of diagenetic processes and fluid migration on rare earth
The effect of diagenesis and fluid migration on rare earth element distribution in pore fluids of the northern Cascadia accretionary margin. Chem. Geol. (2012) ... Rare earth elements and yttrium (REY) are critical elements for a wide range of applications and consumer products. Their growing extraction and use can potentially …
Wetting front migration model of ion-adsorption rare earth …
Request PDF | On Sep 1, 2023, Yu Wang and others published Wetting front migration model of ion-adsorption rare earth during the multi-hole unsaturated liquid injection | Find, read and cite all ...
Interface Modification via Rare Earth Material to Assist Hole Migration …
Interface defect is a limiting factor of the charge dynamics and stability of perovskite solar cells (PSCs). Herein, a rare earth metal oxide cerium oxide is introduced into the interface between perovskite and spiro-OMeTAD [2,2,7,7-tetrakis (N,N-di-p-methoxyphenyl-amine) 9,9-spirobifluorene] to passivate interfacial defects.Due to the nearest-neighbor …
Rare earth element migration in gullies with different …
Little is known about rare earth element (REE) migration in gullies in Southeast China. We examine the concentration and distribution of REE, soil variables, and correlations among REE and soil variables field investigation, laboratory measurement, and statistical analysis in the three gullies with different Dicranopteris dichotoma covers in the Huangnikeng …
Rare earth element migration and impact of
The migration of rare earth elements (REEs) has a major influence on the environment. However, little is known about REEs migration control by Dicranopteris dichotoma at REEs mines. Therefore, this study examined the horizontal and vertical migration of REEs using artificial rainfall and naive soil column experiments, …
