There are around 160 minerals known to contain rare earth elements. However, only four are currently mined for their rare earth elements which are bastnasite, laterite clays, monazite and loparite. Other minerals that have been used as a source of rare earth elements are apatite, euxenite, gadolinite, and xenotime.
The chemical composition of the various weathering products depends largely upon the rate of weathering and it is expected to demonstrate well established concepts on mobility of various elements during weathering and therefore to assess the state of chemical weathering ( Singh et al., 2005 ).
This study investigates the distribution of rare earth elements (REEs) within the Beijing water system, specifically examining the Yongding, Chaobai, …
The rare earth elements comprise Sc, Y, and the lanthanide elements (La–Lu). Their physical properties and physicochemical behaviors are determined by the characteristics of their atomic electron layer arrangements (Gschneidner 1990 ). Several lists in this section give the characteristics of the atomic structure of rare earth elements …
Rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of …
Most rare earth elements find their uses as catalysts and magnets in traditional and low-carbon technologies. Other important uses of rare earth elements are in the production of special metal alloys, glass, and high-performance electronics.
Results of chemical analyses showed a greater content of K, P, Ca, Mg and organic C in the inner part of termite mounds, accompanied by lower pH in relation to soil of the …
Learn how rare earth elements in surface sediments vary across different regions and seasons, and what factors influence their distribution and behavior.
Purpose of Review This review examines recent publications on rare earth elements (REE) in soils, critically evaluating their role as emerging soil contaminants. We emphasized new findings and main gaps using a previous review paper published in 2016 by our research group as a reference point. Three major subjects were prioritized: (1) …
The distribution of elements on Earth is heterogeneous, ranging from the scale of hundreds to thousands of kilometers in the form of the Earth's layered structure (core, mantle, crust, ocean, and atmosphere) down to the scale of millimeters or less in the form of mineral grains or living organisms.
Rare Earth Elements refer to a group of seventeen chemically similar elements, including scandium, yttrium, and the fifteen lanthanides. Despite the name, REEs are not exceptionally rare in terms of abundance in the Earth's crust; however, they are typically dispersed and not often found in concentrated deposits. The significance of REEs lies in …
Global resources of heavy Rare Earth Elements(REE) are dominantly sourced from Chinese regolith-hosted ion-adsorption deposits, yet the adsorption mechanisms remain unclear. Here, the ...
Rare-earth elements are considered a critical raw material because of the large difference between global demand and their fewer resources (Franus et al. 2015 ). Identification of REE distribution and assessment of their possible association with other mineral oxides are crucial to improve the efficiency of their extraction.
Wetlands are specific areas able to regulate metals mobility in the environment. Among metals, rare earth elements (REE) appear to be particularly interesting because of the information that could be provided by the REE patterns. Moreover, as REE are becoming a matter of great economic interest, their significant …
Rare earth elements (REEs) including fifteen lanthanides, yttrium and scandium are found in more than 250 minerals, worldwide. REEs are used in various high-tech applications …
Rare-earth element - Abundance, Occurrence, Reserves: As noted above, the rare earths are fairly abundant, but their availability is somewhat limited, primarily because their …
The rare earths are of a group of 17 chemical elements, several of which are critical for the energy transition. Neodymium, praseodymium, dysprosium and terbium are key to the production of the permanent magnets used in electric vehicles (EVs) and wind turbines. Neodymium is the most important in volume terms.
This study aims mainly at carrying out the chemical and mineralogical characterization of Sra Ouertane phosphorites and studying the REE, Y, Sc, U and Th abundance in the different granulometric fractions of different layers to better explain the distribution of these elements in the Sra Ouertane phosphorite deposit.
Rare earths (RE), chemically uniform group of elements due to similar physicochemical behavior, are termed as lanthanides. Natural occurrence depends on the geological circumstances and has been of long interest for geologist as tools for further scientific research into the region of ores, rocks, and oceanic water. The review paper …
The rare earth elements (REE) have attracted much attention in recent years, being viewed as critical metals because of China's domination of their supply chain. This is despite the fact that REE enrichments are known to exist in a wide range of settings, and have been the subject of much recent exploration. Although the REE are often …
The rare earths (REs) are a family of 17 elements that exhibit pronounced chemical similarities as a group, while individually expressing distinctive and varied electronic …
The crystallization experiment of molten rare earth (RE) slag under different cooling rates was carried out. The characteristics of element migration and phase distribution during RE phase crystallization were studied by using different equipment.
The role of Fe-oxyhydroxides in element scavenging is highlighted by some apatite nodules that maintain their primary middle rare earth element enrichment, while others are characterized by altered rare earth element patterns resulting from competition for these elements between co-crystallizing minerals during deformation.
Rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first …
Dissolved rare earth elements (REE) can reflect the environmental changes in river systems and trace the mixing processes between rivers and the ocean at the estuary. In this study, the dissolved REE concentrations were measured in the river and estuary of the Jiulong River, which supplies drinking water to about one-third of the …
Some rare earths are good catalysts for certain chemical reactions, including cerium for catalytic converters in gasoline cars, and lanthanum for fluid catalytic cracking to refine crude oil.
The rare earth elements (REE) comprise a group of 16 chemically very similar elements that occur widespread in rocks, soils, and water bodies, share similar ionic radii to the essential element Ca2+, and consequently also occur in biota. Given that REE form mainly trivalent cations, they also share similarities to Al3+. Compared to their …
Most rare earth elements find their uses as catalysts and magnets in traditional and low-carbon technologies. Other important uses of rare earth elements are in the production of special metal alloys, …
The rare earth elements (REEs) are 17 metals in Group 3 of the Periodic Table comprising Lanthanide series elements and Scandium and Yttrium (due to similar physical properties and found in the same ores and deposits). Contrary to their name, they are moderately abundant in nature but not concentrated enough to make them …
The relative rare-earth abundances in composite samples of shales, metamorphosed shales, basalts, rhyolites, and granites are remarkably similar to each other, but small differences are apparent, even among the heavier rare earths. Eu and Ce show "anomalous" abundances in several of the samples. A new value for the average Gd …
Importantly, the chemical properties of these elements are similar due to the similarities in the configurations of their outermost and sub-outer electron layer ( Liu et al., 2012a ). …
Obtaining a better understanding of the upper crustal abundance and associated uncertainties of these elements is important in placing better constraints on bulk crust composition and, from that, whole Earth models of …
Purpose The main objectives of this study were to investigate the distribution characteristics and evaluate the potential ecological hazard associated with rare earth elements (REEs) within the Pearl River Estuary (PRE) sediment. Furthermore, we still have not fully understood the contamination and potential ecological risks of REEs in aquatic …
The rare earth elements (REE) have attracted much attention in recent years, being viewed as critical metals because of China's domination of their supply chain. This is despite the …
The rare earth elements are often subdivided into "Heavy Rare Earths" and "Light Rare Earths" according to different electronic layer structures, physical and chemical properties, as well as symbiosis in minerals.
Rare-earth elements. The rare-earth elements (REEs) are 15 elements that range in atomic number from 57 (lanthanum) to 71 (lutetium); they are commonly referred to as …
This paper explores flows and stocks, at the scale of the European Union (EU), of certain rare earth elements (REEs; Pr, Nd, Eu, Tb, Dy and Y) which are associated with products that are important ...
Rare earth elements (REEs) including fifteen lanthanides, yttrium and scandium are found in more than 250 minerals, worldwide. REEs are used in various high-tech applications across various industries, such as electrical and electronics, automotive, renewable energy, medical and defence.
They are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table in addition to scandium and yttrium that show similar physical and chemical properties to the lanthanides.
Rare earth elements (REEs) are essential elements in many technology industries. The commonly used ammonium salt method has caused a bad impact on environment. Bioleaching is widely recognized as a low energy, relatively simple and environmentally friendly method. The purpose of this work is to extract REEs from ion …
