Examination of rare earth element concentration patterns …
The demand for rare earth elements has led to global increases in metal mining and processing, however, few data are available to characterize the fate and transport of these elements in aquatic biota. In this study, we report tissue concentrations of rare earth elements in ten freshwater fish species collected from a large reservoir.
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The Geology of Rare Earth Elements
The estimated average concentration of the rare earth elements in the Earth's crust, which ranges from around 150 to 220 parts per million (table 1), exceeds that of many other metals that are mined on an industrial scale, such as copper (55 parts per million) and zinc (70 parts per million). Unlike most commercially mined base and precious ...
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Upper crustal abundances of trace elements: A revision …
Upper crustal samples used in this study come from those previously well-characterized by major and many of the trace element compositions (Table 1).They include (1) the suite of Post-Archean Shales (PAAS) which Taylor and his co-workers originally used to constrain the rare earth element (REE) contents of the upper crust (Nance and …
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Concentration and distribution patterns of rare earth elements …
The concentrations of Light Rare Earth Elements (LREEs) and Heavy Rare Earth Elements (HREEs) are between 7.66 and 1325.5 mg/kg and 2.56 and 279.89 mg/kg, respectively. The mean concentrations of LREEs, such as La, Ce, Pr, and Nd, are below the values of the Upper Continental Crust (UCC). Conversely, the mean concentrations …
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Extraction and back-extraction behaviors of 14 rare earth elements …
Referring to the pre-experimental results, the temperature gradient in the following study was set at 15, 25, 35 and 45 °C, The concentration of TODGA in aviation kerosene was 0.04 mol/L, the concentration of sulfuric acid in the rare earth aqueous phase was 6 mol/L, and each rare earth element were extracted for 2 min before the …
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One-step enrichment of rare earth elements from ionic rare …
Rare earth elements (REEs), a group of 17 elements in the periodic table, encompass light, medium, and heavy REEs, which are crucial to numerous modern …
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Concentration of rare earth elements from monazite by …
This step improved the rare earth elements recovery in the precipitate from 90.2(1) and 101.68(3) %, while the impurities concentrations remained below 30 %. These results indicated the successful concentration and separation of most rare earth elements from monazite by selective precipitation.
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Concentration Mechanisms of Rare Earth Element-Nb-Zr-Be …
Concentration Mechanisms of Rare Earth Element-Nb-Zr-Be Mineralization in the Baerzhe Deposit, Northeast China: Insights from Textural and Chemical Features …
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Phosphorylated porous phenolic resin for efficient extraction …
Effective recovery of rare earth elements from wastewater is crucial for the modern industry, as well as for protecting the human health and ecosystem. Nevertheless, it is still challenging to realize efficient and selective low-concentration rare earth extraction in systems containing high levels competing metal ions.
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An Updated Review of Toxicity Effect of the Rare Earth …
Rare earth elements (REEs) or "technology metals" were coined by the U.S. Department of Energy, a group of seventeen elements found in the Earth's crust. …
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Concentration of rare earth elements during high temperature pyrolysis
The concentration of REEs in key pyrolysis residues, namely, copper rich red metallic fraction, lead/tin rich white metallic fraction and slag rich carbonaceous residues, were determined using ICP analysis. ... Rare earth elements (REEs) are playing an increasingly crucial and vital role in the electronics industry in applications such as ...
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Iron-Rich Volcanoes Hold Hidden Rare Earth Element Reserves
Experiments show how concentrations of rare earth elements, critical to the green energy transition, might be hiding in plain sight in iron-rich deposits around the world. by Kimberly M. S ...
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Comparative studies on the concentration of rare earth elements …
The concentrations of rare earth elements (REE) and cobalt (Co), zinc (Zn), copper (Cu), cadmium (Cd) and lead (Pb) in the APM were determined by inductively coupled plasma mass spectrometry (ICP-MS). The results obtained in Beijing, China, were compared to that obtained in Delft, the Netherlands, in 1997. ...
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Occurrence, bio-concentration and distribution of rare earth elements …
Individual element concentrations are even lower, with Ce, La, Nd and Y typically at an order of magnitude or two higher than other REE. ... Anomalous concentrations of rare earth elements in the moss-soil system from south - central Poland. Environ. Poll., 178 (2013), pp. 33-40.
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Concentration of Rare Earth Elements in surface water …
The paper presents the results of analyses of the content of rare earth elements (REEs) in surface water and bottom sediment in the river-lake system of Lake Wadąg located in the Masuria Lakeland ...
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Global natural concentrations of Rare Earth Elements in …
The entire database compiled 19,354 data of REEs, with 19,013 concentrations of individual REE and 341 data of ∑REEs. The number of available data per REE (Fig. 1 A) shows a factor of 2 between the most frequently detected REE (La) and the least detected REE (Tm).Except for La, even-numbered REEs (i.e. Ce, Nd, Sm, Gd, …
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Understanding Rare Earth Elements concentrations, …
Rare Earth Elements (REEs) are commonly used in geochemistry as process and/or source tracers, as they behave in a coherent way along the lanthanide series. ... rare earth elements and twenty-two other trace element concentrations in the Natural River Water Certified Reference Material SLRS-6 (NRC - CNRC) Geostand. …
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A novel extraction process for efficient recovery of rare earth
Ion-adsorption type rare earth (RE) ore mainly distributes in Southern China, which contains 0.05–0.2 wt% REO adsorbed on the surface of aluminosilicate clay minerals, is strategic mineral resource especially for heavy rare earth elements (Nie et al., 2020, Wang et al., 2023).The main form of REEs in the ore is the ion-exchangeable phase …
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Phosphorylated porous phenolic resin for efficient extraction …
1. Introduction. Rare earth elements, often referred to as critical strategic materials and industrial vitamins, constitute a family of 17 chemically similar elements compromising scandium (Sc), yttrium (Y) and the lanthanides (Ln) [1], [2].REEs can also be classified as light REEs (LREEs: La-Pm), middle REEs (MREEs, Sm-Gd) and heavy REEs (HREEs: …
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Rare earth elements: A review of applications, occurrence, …
Rare earth elements (REE) include the lanthanide series elements (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) plus Sc and Y. Currently these metals have become very critical to several modern technologies ranging from cell phones and televisions to LED light bulbs and wind turbines.
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Occurrence of rare earth elements in water, sediment, and …
a) Rare earth element (REEs) concentration (mg/kg) and b) total REEs content (mg/kg) in sediment samples (n = 3 per station) from the Po River (northwest Italy). Asterisks indicate significant differences (p < 0.01) in REEs content between stations (Conover-Iman post-hoc test).
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Concentrating on rare-earth elements | Lawrence …
Photo by Dane Rhys/Amerian Rare Earths. Using a bioengineered protein-based technology, Lawrence Livermore National Laboratory (LLNL) scientists and collaborators will develop a new separation technique that …
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Rare-earth element
Rare-earth element - Abundance, Occurrence, Reserves: As noted above, the rare earths are fairly abundant, but their availability is somewhat limited, primarily …
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The rare earth elements of sequentially leached phases in …
The rare earth elements (REEs) are a group of elements that are characterized by very similar chemical behavior and generally occur in the tetravalent state (except for Ce) in highly oxidic surficial environments. ... To obtain the absolute concentrations of each REE element, the Nd concentrations were first calculated …
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Global natural concentrations of Rare Earth Elements in …
The entire database compiled 19,354 data of REEs, with 19,013 concentrations of individual REE and 341 data of ∑REEs. The number of available data …
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The Occurrence and Concentration of Rare Earth Elements …
The conventional rare earth element (REE) industry has historically sought to develop ore deposits where geologic processes have produced mineralized zones with commercially attractive REE concentrations. These deposits are extremely uncommon, particularly in the USA. Given the criticality of these materials and the need for …
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Adsorption of yttrium (Y3+) and concentration of rare earth elements
Chitin powder and chitin-aerogel were prepared from shrimp wastes and used to uptake Y 3+ from aqueous solutions and concentrate this rare earth element from phosphogypsum (PG). Chitin aerogel displays a specific surface area of 945 m 2 /g, while chitin powder is 3.6 m 2 /g, which largely influences its adsorption ability. Regarding the …
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Concentrating on rare-earth elements | Lawrence Livermore …
Using a bioengineered protein-based technology, Lawrence Livermore National Laboratory (LLNL) scientists and collaborators will develop a new separation technique that ultimately will increase the concentration of rare-earth elements (REE) so they are more readily available to the defense sector. Under the Defense Advanced Research Projects …
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High Concentrations of Rare Earth Elements Found in …
WASHINGTON, D.C. - The U.S. Department of Energy's (DOE) National Energy Technology Laboratory (NETL) has found high rare earth element (REE) concentrations in coal samples taken from the Illinois, Northern Appalachian, Central Appalachian, Rocky Mountain Coal Basins, and the Pennsylvania Anthracite …
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Local concentration of middle and heavy rare earth elements …
The rare earth elements are rich in the completely weathered layer and partly weathered layer, but are scarce in the humic layer. 1 The metallogenic condition of weathered crust elution-deposited rare earth ores was concluded by three major conditions by Chi et al., however, the metallogenic process was affected by rock conditions, …
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Notes on the Potential for the Concentration of Rare Earth Elements …
Certain Central Appalachian coals, most notably the Fire Clay coal with a REY-enriched volcanic ash fall tonstein, are known to be enriched in rare earth elements. The Fire Clay tonstein has a greater contribution to the total coal + parting REY than would be inferred from its thickness, accounting for about 20%–35% of the REY in the coal + …
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Characterization and pre-concentration of rare earth elements …
The increased global demand for rare earth elements (REEs) from unconventional sources has led to increased interest and research in coal deposits. South Africa has extensive coal resources, but understanding of the concentration, mode of occurrence, and distribution of REEs in the coals and associated sediments is limited.
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Blood concentrations of metals, essential trace elements, rare …
Very little information is available on the distribution of human body concentrations of rare earth elements (REE) and other minority elements in the general population. Many of such chemicals, along with essential trace elements –and well-known contaminants as lead or cadmium– are used in computers, other high-tech devices, and …
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Concentration, speciation, and fractionation of rare earth elements …
Karst is a unique landform formed by strong chemical weathering of carbonate rocks. This study investigated the concentration and speciation of rare earth elements and yttrium (REY) in alluvial soils and REY fractionation from carbonate rocks and alluvial soils in the world's largest contiguous karst landform in southwestern China.
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Concentration of rare earth elements during high temperature pyrolysis
An in-depth investigation was carried out on the recovery of rare earth elements (REEs) from a variety of waste printed circuit boards (PCBs). High temperature pyrolysis was carried out at 850 °C for 15 min using horizontal resistance and thermal plasma furnaces with different levels of turbulence. The concentration of REEs in key …
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Hypertension risk is associated with elevated concentrations of rare
Serum levels of 8 rare earth elements (REEs) and 13 non-REEs were determined. Results. The concentrations of Ce and La were significant higher in the cases than in the controls in all comparisons. ... The concentrations of most elements in serum were not normally distributed, and thus differences between the cases and controls, in …
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Urine is better for rare earth elements bimonitoring in long …
Direct Quantification of Rare Earth Elements Concentrations in Urine of Workers Manufacturing Cerium, Lanthanum Oxide Ultrafine and Nanoparticles by a Developed and Validated ICP-MS. Int J Environ Res Public Health, 13 (3) (Mar 22 2016), 10.3390/ijerph13030350. Google Scholar. 12.
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Concentration and health risk assessment of 16 rare earth elements …
The concentration of light rare earth elements (LREEs) in six types of tea was higher than that of heavy rare earth elements (HREEs). The daily mean and 95th percentile (P95) exposure to REEs from tea for the general population in China were 0.0328 μg/kg BW and 0.1283 μg/kg BW, respectively, which are significantly lower than the …
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Modes of occurrence and pre-concentration of rare earth elements …
1. Introduction. Generally, rare earth elements include 15 lanthanides (La–Lu) and yttrium (Y), namely REE + Y, so rare earth elements are usually referred to as REY. 1 REY has excellent magnetic, optical and electrical properties, which is widely used not only in traditional fields such as military, petrochemical, metallurgy, but also in the …
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RARE EARTH ELEMENTS IN COAL FLY ASH AND THEIR …
Coal fly ash is a potential resource of valuable elements, such as rare earth elements (REEs), which are retained and concentrated upon combustion. Understanding REE occurrence within fly ash is vita...
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