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Showing 1 to 20 of 160 for “"REEs"”.
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Rees algebras and iterated Jacobian duals
… the coordinate ring of the graph of Ψ is the Rees algebra of <em>I</em> and the co-ordinate ring of the image of Ψ is the special fiber ring. We study two settings. The first setting is when <em>I</em> is almost linearly presented. Here we study the ideal defining the graph and the image of Ψ. …
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Rees matrix semigroups over special structure groups with zero
… directed graph G(P). Let S=M°(G;In,In;P) be a Rees matrix semigroup. Then the graph G(P) is called the associated graph of the semigroup S, or simply it is the graph G(P) of S. Theorem 3. A Rees matrix semigroup S=M°(G;In,In;P) is homogenous m² regular if the directed graph G(P) of the …
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Rare Earth Elements (REEs) Recovery and Hydrochar Production from Hyperaccumulators
… mg/kg (dry basis) of total rare earth elements (TREEs) in grass leaves. With the use of conventional hydrometallurgy, around 95% of Y, La, Ce, and Dy were extracted from the GL using 0.5 mol/L H2SO4 at a solid concentration of 5 wt.%. Subsequently, microwave-assisted hydrothermal carbonization …
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Prime Saturations and Rees Algebras of Almost Linearly Presented Ideals
… two descriptions of the ideal A defining the Rees algebra Rees(I) and if in addition I is generated by d+1 elements, we give an explicit generating set for A.
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In service to mathematics: The life and work of Mina Rees.
… to mathematics: The life and work of Mina Rees.
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Correlations between the Mineralogy and Recovery Behavior of Rare Earth Elements (REEs) in Coal Waste
… published recently regarding the recovery of REEs from coal-related materials, such as coal waste, acid mine drainage, and coal combustion ash. The recovery of REEs from coal waste has been investigated by the author in recent years, and it was found that after calcination at 600 ℃ for 2 h, a …
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Rare Earth Extraction from Clayey Waste Materials by Alkali Pretreatment
The increasing demand for rare earth elements (REEs) and the depletion of conventional rare earth deposits have enabled secondary REE resources to be promising feedstocks for REEs. Studies have been conducted in developing technologies that can physically preconcentrate and/or chemically extract …
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Geochemical Behavior of the Rare Earth Elements in Natural Terrestrial Waters
… 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 different aquifer types (i.e., sand vs. carbonate); and (3) …
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Identification, Characterization, and Speciation of Rare Earth Elements in Coal Refuse
… extracting and processing rare earth elements (REEs) is becoming increasingly important. Special focus has been placed upon the identification of REEs within coal refuse, but the phase designation and speciation is not fully understood. This investigation focuses on the characterization, …
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Predicting the Distribution Coefficient of Solvent Extraction of Rare Earth Elements Based on the Gibbs Free Energy and Thermodynamic Theory for Equilibrium Constant
Rare Earth Elements (REEs) are a class of 17 elements, including the lanthanides (15 elements), scandium (1 element), and yttrium (1 element). REEs minerals consist of 9-10 REEs excluding promethium. The separation of REEs minerals into their components is achieved by the solvent extraction …
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Concentration and Recovery of Rare Earth Elements from Eastern US Coal Refuse
… 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 the Appalachian coal …
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Development of Leaching Processes for the Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates
… minerals, including rare earth elements (REEs). This environmental waste stream is now being researched as a potential source for REEs. There is a patented process for processing and extracting REEs from AMD which produces rare earth oxide preconcentrate (REOP) from AMD treatment …
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Silica Nanoparticle-Based Platform for Rare Earth Element Recovery and Separation
Rare earth elements (REEs) are essential for clean energy technologies including batteries for electrical vehicles, wind turbines and LED screens due to their unique magnetic, optical, and electronic properties. Efficient methods for their recovery and separation are urgently needed to meet the …
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Rare Earth Elements as a Tracer to Understand Sediment Fate and Transport in Small Streams
… this study were to: 1) assess the adsorption of REEs to natural soils and ensure their reliability as a tracer in a fluvial environment; and 2) evaluate the efficacy of utilizing REE-labeled sediment to quantify fate and transport in a second-order stream during a series of storm events. Two …
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Developing Materials for Rare-Earth–Element Chelation: Synthesis, Solution Thermodynamics, and Applications
Rare Earth Elements (REEs: La–Lu, Y, and Sc) are critical components for technological innovations, therefore more effective methods for the domestic extraction and purification of REEs are in ever-increasing demand. Metal-chelating polymers have great potential in these applications due to their …
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Characterization of Uranium and Rare Earth Element Mobility and Attenuation Downstream of Decommissioned Tailings Impoundments at the Bicroft Mine near Bancroft, Ontario
… of uranium (U) and rare earth elements (REEs) has been observed in stream and wetland sediments, but the geochemical and mineralogical processes involved in sequestering these elements in natural systems are not well understood. The decommissioned Bicroft Uranium Mine near Bancroft, ON …
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Production of High-Grade Mixed Rare Earth Oxides from Acid Mine Drainage via Solvent Extraction: Laboratory-Scale Process Development
… be a promising source of rare earth elements (REEs), which are essential feedstocks for many high tech applications and defense products. AMD is a longstanding environmental challenge and is currently the primary pollutant of water in the Appalachian coal mining region. Acid generated during …
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International Trade, the Environment and Natural Resources
… but require as inputs rare earth elements (REEs), which pollute the local environment. China, the major producer of REEs, has been challenged at the WTO for its export restriction on REEs and has proposed to switch to a domestic environmental policy. In the second chapter, my coauthor and I …
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Hydrophobic-Hydrophilic Separation Process for the Recovery of Ultrafine Particles
The demands for copper and rare earth elements (REEs) in the U.S. will keep rising due to their applications in green energy technologies. Meanwhile, copper production in the U.S. has been declining over the past five years due to the depletion of high-grade ore deposits. The situation for REEs is …
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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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