آخرین محصولات
Poly (vinyl alcohol-co-ethylene) (EVOH) modified
Efficient separation of adjacent rare earths is an interesting and challenging job for membrane separation scientists. In this article, a novel polymer inclusion membrane (PIM) incorporating the hydrophilic additive random copolymer poly (vinyl alcohol-co-ethylene) (EVOH) was synthesized.Due to the polarity of P = O and P-OH groups in …
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A Primer on Hydrometallurgical Rare Earth Separations
Lanthanide Separations. The term "rare earth" is a misnomer as it is relatively abundant; the "rare" originates from difficulty in isolating individual lanthanide elements. Chemically, rare earth elements are very similar, and most exist solely in a 3+ oxidation state with the exceptions of Ce (IV), Pr (IV), Tb (IV), Sm (II), Eu (II ...
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Review on hydrometallurgical recovery of rare earth metals
Leach liquor was put to SX using 25% D2EHPA in kerosene, followed by stripping of rare earths from organic solution. Further, rare earths were precipitated using oxalic acid. Zhang et al., 1998, Zhang et al., 1999: Sulfuric acid: A selective separation of rare earths by precipitation of sodium rare earth double sulfate was performed.
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The West is slowly rebuilding its rare earths supply chain
LKAB's 400 million kroner ($40.3 million) investment will help REEtec finance a substantial portion of its rare earths separation factory in the Norwegian industrial peninsula of Herøya, where ...
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Separation of Rare Earth Elements
The 17 rare earth elements, or lanthanides, consist of elements 21 (scandium), 39 (yttrium), and 57 (lanthanum) to 71 (lutetium). The rare earths were so named because of their low …
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New, environmentally friendly method to extract and separate rare earth
Credit: Dong et al. 2021, ACS Central Science. A new method improves the extraction and separation of rare earth elements—a group of 17 elements critical for technologies such as smart phones ...
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An overview on membrane strategies for rare earths extraction …
Numerous membrane strategies for rare earths separation have been designed but few reviews could be found. The present article makes a state-of-the-art summary on current membrane techniques in rare earths separation including both liquid and non-liquid membranes. Further understandings of the crucial scientific and technical …
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Rare Earths Statistics and Information | U.S. Geological Survey
The rare earths are a relatively abundant group of 17 elements composed of scandium, yttrium, and the lanthanides. The elements range in crustal abundance from cerium, the 25th most abundant element of the 78 common elements in the Earth's crust at 60 parts per million, to thulium and lutetium, the least abundant rare-earth elements at about 0. ...
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Selective separation could help alleviate critical metals shortage
This avoids traditional but costly liquid separation methods that require significant energy. The researchers developed processing conditions for 56 elements and tested these conditions on 15 elements. ... Metals like cobalt and rare earths are only found in small amounts in mined materials, so industries must process large volumes of …
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Rare-earth separation based on the differences of ionic
The separation of rare earth elements is particularly difficult due to their similar physicochemical properties. Based on the tiny differences of ionic radius, solvent extraction has been developed as the "mass method" in industry with hundreds of stages, extremely intensive chemical consumption and large capital investments. The differences …
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Extraction and separation of heavy rare earth elements: A review
With the development of the rare earths separation industry, there have been multifarious methods including chemical separation (fractional crystallization, fractional precipitation) [12], REDOX [13], [14], [15], ion exchange [16], [17] and solvent extraction [18], [19] are used to obtain pure HREEs. ...
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Lynas selected to build heavy rare earths separation facility in US
Australia's Lynas Rare Earths has received a nearly $120m follow-on contract from the US Department of Defense (DoD) for the construction of a commercial heavy rare earths (HRE) separation facility in Texas. Awarded to Lynas' US subsidiary, the contract builds on the Phase 1 agreement for an HRE separation facility that was …
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Accomplishing simple, solubility-based separations of rare earth
Rare earth elements, La–Lu, Y, and Sc, have applications in many technologies, including permanent magnets (1–5), NiMH batteries (6–10), and lamp phosphors (11–14).Limitations associated with their beneficiation and separations, especially their solvent-, waste-, and energy intensities, have contributed to the concentration of …
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Selective separation of light rare-earth elements by
10 Citations 12 Altmetric Metrics Abstract Supramolecular chemical strategies for Rare Earth (RE) element separations are emerging which amplify the small changes …
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How to Separate Heavy Rare Earth Elements
A separation mechanism referred to as displacement chromatography is initiated by a retaining ion loaded onto a strong cation exchange resin (i.e., sulfonic resin) in a separation column. A solution of mixed REE (i.e., mixed-rare-earth band) is saturated on the sulfonic resin in another column called the loading column.
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DOD Announces Rare Earth Element Award to Strengthen Domestic
The Hondo, Texas facility will complement Lynas' existing Australian and Malaysian operations and is expected to be co-located with the proposed Heavy Rare Earths separation facility.
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Biomining Rare-Earth Elements | Cornell Engineering
Once the rare earths have been leached out of the monazite or other ores, they still need to be separated from each other and from the impurities that make it through the leaching process. Current methods of separation, such as liquid-liquid solvent extraction and the ion-exchange process, are energy-intensive and result in large amounts of ...
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Recent advances in selective separation technologies of rare …
A new approach for grouping separation of multi- rare earths coexisting complex systems by liquid-liquid-liquid three phase system consisting of Cyanex272/PEG/(NH 4) 2 SO 4-H 2 O was investigated. It was found that, the 15 rare-earth elements, including lanthanides and yttrium, could be separated into three groups and …
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Selective separation of light rare-earth elements by
The separation of the rare-earth elements is a significant scientific challenge. Here, the authors report the selective precipitation of the light rare-earths as supramolecular capsules from ...
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Recent advances in selective separation technologies of rare …
In natural mineral resources and rare earth secondary resources, many other heavy metal elements are usually associated, but high-purity rare earths are required in industrial applications, so the separation of rare earth elements has received attention in recent years [12], [13]. In the process of extracting or recovering rare earths from rare ...
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Canadian firm secures exclusive rights to Purdue's rare-earth …
"After extensive review (Sept. 25, 2020) of over 25 competing separation technologies, we believe Linda Wang's LAD technology has the potential to be REE-industry changing and will become an important part of Medallion's rare-earth element processing capability. We are excited to be working with Linda Wang and her Purdue team."
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US wants to reclaim critical rare earth supply chain
The goal is to have a separation facility in place by the end of 2022, Sloustcher said. MP Materials has a three stage plan, with the ultimate goal of creating a full supply chain of rare earth mining, separation, and magnet manufacturing in the U.S. "The company's mission is to restore the full rare earth supply chain to the United States.
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Lynas shares jump on deal for US rare earth plant
Australian rare earths miner Lynas Corp's (ASX: LYC) shares jumped on Friday after it announced a deal with the US government to build a commercial light rare earths separation plant in Texas ...
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Advancing Rare-Earth Separation by Machine Learning
Here, we show that deep neural networks, trained on the available experimental data, can be used to predict accurate distribution coefficients for solvent extraction of lanthanide …
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A review on the recovery and separation of rare earths and …
Numerous membrane strategies for rare earths separation have been designed but few reviews could be found. The present article makes a state-of-the-art summary on current membrane techniques in rare earths separation including both liquid and non-liquid membranes. Further understandings of the crucial scientific and technical …
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Rare-earth element | Uses, Properties, & Facts | Britannica
The name rare earths itself is a misnomer. At the time of their discovery in the 18th century, they were found to be a component of complex oxides, which were called "earths" at that time. ... (1787–1947), the separation and purification of the rare-earth elements was a difficult and time-consuming process.
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Hydrometallurgy of Rare Earths | ScienceDirect
Solvent extraction-separation is the main method to separate rare earths. The main extractants used in extraction-separation of rare earths are HEH (EHP), HDEHP, Cyanex 272, N235, N1923, and so on. This chapter systematically discusses their extraction mechanism, properties, and features of rare earths, including the effects of solvents, type ...
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Recent advances in selective separation technologies of rare …
This article mainly summarizes the latest developments in the separation of rare earth elements, evaluates the advantages and disadvantages of various …
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New, environmentally friendly method to extract and separate …
A new method improves the extraction and separation of rare earth elements—a group of 17 elements critical for technologies such as smart phones and …
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Pentagon bankrolls rare earths plant as US plays catch-up to China
The US Department of Defense has signed a $120mn deal with Australia's Lynas Rare Earths to build one of the first US domestic heavy rare earths separation facilities, part of Washington's ...
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