Effective recovery of rare earth from (bio)leaching solution …

However, since rare earth elements exist as complexes in bioleaching lixivium, they cannot be directly precipitated by normal precipitants, which restricts their further development. ... (bio)leaching solution through precipitation of rare earth-citrate complex Water Res. 2023 Feb 15;233:119752. doi: 10.1016/j.watres.2023.119752. Online ahead ...

Ion-imprinted chitosan prepared without cross-linking agent …

In this study, ion-imprinted chitosan (IIP-CS) was prepared by a simple one-step hydrothermal method without a cross-linking agent for the efficient adsorption of trace amounts of Al(III) from a rare earth solution. The structures and morphology of IIP-CS were analyzed by FT-IR, SEM, and XRD.

Selective ion exchange recovery of rare earth elements from …

A comparative study of rare earth, ferric and aluminum ions ion exchange behavior on gel sulfonated рolystyrene cation exchange resins depending on the degree of the matrix cross-linking and pH of the solution is presented. ... The preliminary results of testing the efficiency of REEs recovery from the industrial uranium underground leaching ...

The Energy Transition Will Need More Rare Earth …

In southeastern Wyoming, an Australian company, American Rare Earths, believes it has discovered the largest known rare earth element deposit in North America. This company's goal is to eventually …

(PDF) A critical review on solvent extraction of rare earths …

This paper reviews the chemistry of different solvent extractants and typical configurations for rare earth separations. Plot of Log K (Log D) as a function of atomic number (Z) (0.75 M HDEHP in ...

Selectively removal of Al(III) from Pr(III) and Nd(III) rare earth

Rare earth is a very important strategic resource. But, impurities, such as Al 3+, have great influence on the properties of rare earth material.In this paper, an Al 3+-ionic imprinted polyamine functionalized silica gel sorbent was prepared by a surface im technique for selectively adsorbing Al 3+ from rare earth solution. The adsorption and …

U.S. Begins Forging Rare Earth Supply Chain

According to a report by independent research firm Adamas Intelligence, the global demand for rare earth oxides is forecasted to triple from $15 billion in 2022 to …

Selective removal of aluminum ions from rare earth solutions …

The removal of impurity Al(III) from rare earth ion solution by selective adsorption method was one of the challenging tasks. Herein, calcination and acid dissolution treatment were used to construct the pore structure for the halloysite substrate (Hal-650-H) and provide conditions for the formation of the chitosan mesoporous …

Recovery of rare-earth metals from aqueous solutions by …

Table 1 shows the fitting of the pseudo-first-order (PS1) and pseudo-second-order (PS2) models to the experimental kinetic data of adsorption of rare-earth ions in different bio/adsorbent materials. One can observe that, in almost all the cases, the pseudo-second-order model adjusts the experimental data, indicating the mechanism of …

A clean way to extract rare earth metals

A clean way to extract rare earth metals. New method separates metals using solutions no more acidic than hydrochloric acid. By Leah Burrows | Press contact. …

Reducing rare earth loss by adding acetic acid in the …

The ionic-type rare earth ore, abundant in medium and heavy rare earth elements, is a strategic mineral resource.The removal of aluminum from ionic rare earth leaching solution results in over 8% loss of rare earths. Preliminary research has found that adding acetic acid (HAc) during aluminum removal process can effectively reduce …

Reducing rare earth loss by adding acetic acid in the …

Lanthanum oxide powder (99.99%, provided by Qiandong Rare Earth Group Co., Ltd. is dissolved in sulfuric acid to obtain a 20.0 g/L (Calculated by rare earth oxide (REO), the same below) lanthanum sulfate solution. The mixed rare earth carbonate (Chalco Guangxi Nonferrous Chongzuo Rare Earth Development Co., Ltd.) was …

Effect of rare earth solution on mechanical and tribological …

Rare earth solution (RES) surface modification and air-oxidation methods were used to improve the interfacial adhesion of the carbon fiber reinforced polyimide (CF/PI) composite. The mechanical and tribological properties of the PI composites reinforced by the carbon fibers treated with different surface modification methods were …

Rare earth mining may be key to our renewable energy …

Klinger says she's cautiously optimistic that the rare earth mining industry can become less polluting and more sustainable, if such solutions are widely adopted. "A lot of gains come from the ...

Influence of aluminum ions distribution on the removal of …

Rare earth oxides (analytical reagent grade) were bought from Baotou Rare Earth Plant, China. The de-ionized water was used during the experiments. Rare earth solutions were prepared in the laboratory. A certain amount of rare earth oxides was put in the breaker, and then 4 mol/L hydrochloric acid was slowly added into the breaker. The …

Adsorptive recovery of rare earth elements from aqueous solution …

Rare earth elements (REEs) have become crucial resources in the electric vehicle industry; however, their recycling remains challenging. In this study, we developed a carboxymethylated cellulose nanofibril aerogel crosslinked with citric acid (CMCNF-CA aerogel) through thermal treatment and employed it as an adsorbent for REE recovery.

Environmentally friendly comprehensive hydrometallurgical …

Dysprosium (Dy), neodymium (Nd), and terbium (Tb) known as part of the rare earth elements (REEs) are vital components in permanent magnets, catalysts, …

Occurrence and vertical distribution of aluminum and rare …

KCl solution was chosen over (NH 4) 2 SO 4 solution as the extractant for the ion-exchangeable form to eliminate the influences of sulfate and hydrogen ions. 24, 25 HCl solution was chosen as the extractant to investigate the inorganic hydroxy form of RE and Al in the weathered crust elution-deposited rare earth ore under dilute acid conditions.

Recent advances in selective separation technologies of rare …

The chelated rare earth element enters the ionic liquid from the aqueous solution, and finally the ionic liquid containing the rare earth ions continuously stripped …

Effect of particle gradation on pore structure and seepage …

Rare earth ores with different particle sizes were reconstituted into 120 g of ore samples with four kinds of particle gradation, named A, B, C and D respectively, as shown in Table 2.In addition, the fractal theory was initially applied to the kinetics of uranium heap leaching, mainly used to describe the particle distribution characteristics of uranium …

Rare Earth Elements—Separation Methods Yesterday and Today

Rare earth elements (REEs) belong to the group of strategic elements. Their separation together with the spectral, magnetic and coordinative properties of REEs is essential for their further applications. ... The rare earth was obtained as a chloride solution with an overall recovery of 97.8%. Several other studies described the …

Synthesis of a green ALG@KLN adsorbent for high-efficient …

The selective adsorption steps were as follows: 200 mL of a solution containing a mixture of 100 mg/L rare earth ions and co-existing metal ions (Na +, Mg 2+, and Al 3+) at a concentration of 50 mg/L each were …

Use of an Annular Silicon Drift Detector (SDD) Versus a

A number of techniques for the characterization of rare earth minerals (REM) have been developed and are widely applied in the mining industry. However, most of them are limited to a global analysis due to their low spatial resolution. ... Versus a Conventional SDD Makes Phase Mapping a Practical Solution for Rare Earth Mineral Characterization ...

Rare-earth element | Uses, Properties, & Facts | Britannica

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 elements below the main body of the periodic table ( cerium [Ce] through lutetium [Lu]). The elements cerium through lutetium are called the lanthanides, but ...

Removal of Aluminum from Synthetic Rare Earth Leach Solution …

a rare earth solution configured with yttrium as the main component. The concentration. of Y. 3+ in the solution was 5 g/L, and the Al. 3+ content was adjusted according to the. experimental study.

Supersaturation and crystallization behaviors of rare-earth …

Chemical solution deposition is widely used in the preparation of rare-earth-based cuprate superconducting thin films, namely RE x Ba 2 Cu 3 O 7-y (RE = rare earth element). The crystallographic orientation of the films is strongly dependent on the degree of supersaturation during crystallization.

Characteristics of Precipitation of Rare Earth Elements …

The effective and selective leaching of rare earth elements (REEs) from various sources is frequently possible in practice by adopting a carefully coordinated strategy incorporating a selective precipitation of these elements from undesired ones in solution. In this study, the behavior of chemical precipitation of REEs with commonly …

How science could make recycling rare earth elements easier

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Green rare-earth recycling goes commercial in the USameslab.govThe only five rare earth elements that matter

WEBAfter filtration or counter current decantation (CCD), solvent extraction is usually used to separate individual rare earths or produce mixed rare earth solutions …

The race to produce rare earth materials | MIT Technology …

Obtaining rare earth elements begins with obtaining source materials, which can happen, broadly, in three ways: primary extraction, or mining directly from the earth; recovery from secondary...

Recent advances in selective separation technologies of rare earth

The chelated rare earth element enters the ionic liquid from the aqueous solution, and finally the ionic liquid containing the rare earth ions continuously stripped to separate the REE. However, under certain conditions, both the cation and anion components of the ionic liquid can enter the water phase, resulting in the loss of the ionic …

Selective Oxidation of Cerium in Rare Earth Solutions, a

Separation of rare earth elements (REE) is often achieved by acid leaching of mineral concentrates followed by subsequent solvent extraction (SX), to purify individual rare earth metals (REM). Cerium, the most abundant REE, is usually the largest component of these ores. Demand for less prevalent REE, such as praseodymium and …

Removal of Aluminum from Synthetic Rare Earth Leach Solution …

The simulated rare earth leaching solution used for the experimental study process was a rare earth solution configured with yttrium as the main component. The concentration of Y 3+ in the solution was 5 g/L, and the Al 3+ content was adjusted according to the experimental study.

Determining rare-earth elements in aqueous solutions …

A PGNAA set-up consisting of a 241Am-Be neutron source and a HPGe detector was proposed to determine rare-earth elements in leachate during infiltration process, and was conducted to analyze samples containing gadolinium, samarium, and neodymium. A good agreement between the experimental net peak areas and the MCNP …

Selective removal of aluminum ions from rare earth solutions …

It is, therefore, especially important to separate aluminum ions from rare earth in the production process. It is relatively easy to remove macro aluminum impurities from rare earth leaching solution. The aluminum removal rate is 98.4% and the aluminum content from 4600 mg·L −1 to less than 80 mg·L −1 by using oxalic acid precipitation [18].

Journal of Rare Earths

The leach solution is directly treated using P507 extractant by centrifugal extraction to produce rare earth chloride solution. The recovery of rare earths is increased by more than eight percent compared with the conventional precipitation process, avoiding the environmental pollution of ammonia nitrogen wastewater and radioactive solid waste ...

Enhanced impurity removal of ionic rare earth leaching solution …

Lauryl glucoside was the first time used in an ionic rare earth leaching solution. • No ammonia nitrogen was produced compared to NH 4 HCO 3 when LG was used.. LG has a high-efficiency impurity removal effect when compared with NH 4 HCO 3.. In pH 5.4, HCO 3 – and CO 3 2– produced by NH 4 HCO 3 which caused the loss of …

Structural, electrical, and magnetic study of La-, Eu-, and Er

In this work, the multiferroic bismuth ferrite materials Bi 0.9 RE 0.1 FeO 3 doped by rare-earth (RE = La, Eu, and Er) elements were obtained by the solution combustion synthesis. Structure ...

Adsorption toward Trivalent Rare Earth Element from Aqueous Solution …

Zeolite imidazolate frameworks (ZIFs) have been applied to gas adsorption, but there remain no reports detailing the adsorption–desorption process for lanthanum metal ion (LMI). This work first testifies that ZIF-8 has a better adsorption property than ZIF-90 for remediation of LMI from water. Adsorption results demonstrate that ZIF-8 removes …

The enrichment of rare earth from magnesium salt leaching solution …

1. Introduction. Rare earth (RE) is known as the treasure house of new materials and listed as the key element for the development of high-tech industry in many countries (Jyothi et al., 2020).Ion-adsorbed type RE ore is the main source of heavy REEs in the world (Zhou et al., 2021).Ammonium sulfate leaching is a common method for ion …

Corrosion inhibition with rare earth metal compounds in aqueous solutions

The rare earth hydroxides formed do not possess amphoteric properties, are stable in alkali solutions and dissolve in acid solutions. Consequently, the hydroxides will precipitate in those areas where the pH is sufficiently alkaline to reach their solubility product, according to the reaction described by Pourbaix (1963) : [3.1] Log [ M 3 ...