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Showing 1 to 20 of 146 for “"Rare earth elements"”.
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The marine geochemistry of the rare earth elements
… developed for the determination of 12 of the 14 Rare Earth Elements (REE) in seawater. Initial extractions of the REE by chelating ion exchange chromatography is followed by cation exchange for removal of co-extracted U and remaining traces of major ions. Finally traces of U are removed by anion …
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The marine geochemistry of the rare earth elements
… Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
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Ligand Design For The Separation Of Rare Earth Elements
Rare earth elements (La-Lu, Sc, and Y) exhibit unique magnetic and optical properties that make them irreplaceable components of many technologies. Concerns over the rare earth supply chain have focused efforts toward recycling rare earths from end of life technology. Less than 1% of the rare earth …
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Liquid-liquid extraction of rare earth elements from sulfuric acid
… of novel amide ligands for the extraction of rare earth elements. Chapter I is the general introduction of the practical process and applications of solvent extraction and its theory. It describes systems involving compound formation, ion-association and solvation as well as solvent loading …
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Rare Earth Elements (REEs) Recovery and Hydrochar Production from Hyperaccumulators
… is a promising method for metal recovery, but rare studies have been devoted to metal recovery from hyperaccumulator biomass. The objective of this study was to propose efficient and sustainable methods for treating REE hyperaccumulators, aimed at enhancing REE recovery and obtaining …
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Selective Recovery of Rare Earth Elements using Green Foam Flotation
The extraction of REE from the primary ores is a complex process and causes damages to the environment. Hence, recent research efforts in this field have focused on finding alternative separation methods to reduce the costs and environmental impacts of the process. One such alternative approach …
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Hydrometallurgical Processing Of Rare Earth Elements From Ion Adsorption Clays
… and heap leaching of China's ion-adsorption rare-earth resources have caused severe environmental damage, there is a need to better understand Rare Earth leaching from Clay ore with the use of agglomerates that improve the permeability of the ore during heap leaching operation. The practice …
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Geochemical Behavior of the Rare Earth Elements in Natural Terrestrial Waters
<p>This dissertation presents three manuscripts describing the following aspects of the geochemical behavior of REEs: (1) solution complexation of REEs with both inorganic and organic ligands in natural terrestrial waters; (2) the geochemical behavior of REEs along the groundwater flow paths in two …
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Lanthanide Binding Tag Peptides for Selective Separation of Rare Earth Elements
<p>The rising demand for rare earth elements (REEs) necessitates more sustainable and selective separation methods. This research explores peptide-based strategies using lanthanide-binding tags (LBTs), short peptides that coordinate REEs with high affinity. Two approaches are investigated: (1) …
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Identification, Characterization, and Speciation of Rare Earth Elements in Coal Refuse
Rare earth elements are the 14 lanthanides on the periodic table, plus yttrium and scandium. These elements play a critical role in modern-day technologies such as liquid-crystal displays, GPS systems, and fiber optic cables. A majority of the mining of these elements is from China; however, due to …
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Extraction of Rare Earth Elements from Aqueous Solutions by Using Hydrometallurgical Techniques
Rare earth elements (REEs) are essential in today's applications due to their unique characteristics. The growing ecological consciousness of developing nations has resulted in a considerable move away from conventional energy sources due to an increasing demand for environmentally friendly …
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Detection of rare earth elements and rare earth oxides with hyperspectral spectroscopy
The continuously increasing demand for rare earth elements in technical components of modern technologies, brings the detection of new deposits closer into the focus of global exploration. One promising method to globally map important deposits might be remote sensing, since it has been used for a …
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Experimental evaluation of recycling rare earth elements from waste fluorescent light fixtures
Includes bibliographical references (pages 89-91).
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Concentration and Recovery of Rare Earth Elements from Eastern US Coal Refuse
… and coal byproducts contain elevated contents of Rare Earth Elements (REEs), making them a potential resource for these critical materials. The approach employed in this research focused on the concentration and extraction of REEs from fine coal refuse derived from various preparation plants in …
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Gradient ion chromatographic determination of rare earth elements in coal and fly ash
Rare Earth Element (REE) determination in samples of coal and fly ash was undertaken by gradient high performance ion chromatography (HPIC). Ion chromatographic analysis requires that samples be in solution and that the matrix transition metals be removed. Coal samples, weighing 0.20g, were …
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Fundamental Studies on the Extraction of Rare Earth Elements from Ion Adsorption Clays
Rare earth elements (REEs) are critically important for high-tech, renewable energy and defense industries. However, rare earth minerals (REMs) are stable compounds, requiring aggressive conditions to decompose them for their extraction and use. One exception is the ion-adsorption clays (IACs) that …
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Quantifying periods of diffusion in marine and nonmarine vertebrate fossils using rare earth elements
Concentrations of rare earth (REE), U, Th, and other trace elements (TE) were measured using LA-ICP-MS along transects across five Late Eocene brontothere bones from the terrestrial Late Eocene Chadron Formation of Nebraska and four Miocene marine mammals from the Atlantic Coastal Plain. Samples …
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Separation, preconcentration and determination of rare earth elements by inductively coupled plasma emission spectroscopy
Rare earth elements, (REE), at ug g⁻¹ levels are used for studies of petrogenisis of different geological materials. For these studies, the REE must be determined precisely. An analytical program was established using an IL 200 Inductively Coupled Plasma, (ICP), spectrometer for the determination …
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