Review of efficient recycling and resource utilization for rare earth
The molten salt electrolysis method includes rare earth fluoride (REF 3-LiF-RE 2 O 3) and rare earth chloride (RECl 3-MeCl x) two systems. Fig. 3 shows the electrolysis production process of rare earth molten salt. Compared to the latter, the fluoride system has the advantages of higher current efficiency and metal yield, stable electrolyte …
Thermodynamics of crystal hydrates of rare-earth metal …
Work of desolvation values for rare-earth-metal perchlorate, chloride, and nitrate electrolytes across the rare-earth-metal series from 0.1 to 1 m are relatively uniform and are in the sequence of perchlorates > chlorides > nitrates. Changes in T..delta..S in this region are in the sequence of perchlorates > nitrate > chlorides and reveal a ...
Isopiestic determination of the activity coefficients of some …
Isopiestic Studies on Rare Earth Chloride Quaternary System (H2O + LaCl3 + PrCl3 + NdCl3) and Ternary Subsystems. Journal of Chemical & Engineering Data 2013, 58 (9) ... IUPAC-NIST Solubility Data Series. 87. Rare Earth Metal Chlorides in Water and Aqueous Systems. Part 1. Scandium Group (Sc, Y, La).
Rare Earth Chemicals Suppliers
Manufacturer of rare earth chemicals for the aerospace, agricultural, automotive, laboratory, military, mining, oil field and wastewater treatment industries. Processes include chemical and physical vapor deposition, electrolysis, electroplating, spray, vibratory and distillation. High purity specifications range from 99 to 99.9999 % …
Preparation of Rare-Earth Chlorides | Nature
THE preparation of chlorides of the rare-earth elements directly from monazite by chlorination in the presence of carbon possesses certain advantages over conventional …
Boosting the extraction of rare earth elements from …
Boosting the extraction of rare earth elements from chloride medium by novel carboxylic acid based ionic liquids - ScienceDirect. Journal of Molecular Liquids. …
Selective Heteroepitaxial Nanocrystal Growth of …
Corresponding Author. Prof. Dr. Ling-Dong Sun. [email protected]; Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, …
Numerical Simulation on the Device of Rare Earth Oxide
Based on the industrial applications of jet pyrolysis technology and it being used for the production of rare earth oxides, the paper hopes to find out an efficient, economic, and environmental friendly new technology which is suitable for production of rare earth oxides. In this paper, a chloride pyrolysis water model is designed, and …
Conductivity of some rare earth chlorides in sub and …
It is clear that in all rare earth chloride cases, the effect of viscosity reduction is the predominant in that temperature region. Download : Download full-size image; Fig. 3. Specific conductance of 0.001 M NdCl 3 as a function of temperature at several pressures. Download : Download full-size image; Fig. 4.
The effect of doping rare-earth chloride dopant on the …
A series of rare-earth chlorides has been adopted to catalyze dehydrogenation reaction of NaAlH 4.X-ray diffraction analysis and isothermal dehydrogenation measurement have proved that these chlorides enhance the dehydrogenation kinetics and lower the decomposition temperature of NaAlH 4.The …
Separation of uranium and thorium from rare earths for rare earth …
Rare earth double salts first are converted to the corresponding RE hydroxide, and then are selectively dissolved by HCl, leaving thorium in the solid residue. Very small amounts of thorium and uranium in the rare earth chloride solution are removed by ion exchange (IX). The resin used is not disclosed. Download : Download full-size …
Life Cycle Assessment of Representative Individual Light Rare Earth
Light rare earth chlorides typically consist of lanthanum chloride, cerium chloride, praseodymium chloride and neodymium chloride. As the public concern on the issues of emission reduction and energy saving during the past decades, it is valuable to evaluate and analyze the comprehensive environmental impact caused by the rare earth …
Extraction of Rare-Earth Elements from Chloride and Nitrate …
The extraction of rare-earth elements (REEs) from chloride (0.01 M HCl + 0.1 M NaCl) and nitrate (0.01 M HNO3 + 0.1 M NaNO3) solutions in ternary hexane–isopropanol–water systems with the use of di(2-ethylhexyl)phosphoric acid (D2EHPA) as an extragent is studied. It is shown that the extractability of rare-earth …
Reduction of Rare Earth Elements Through …
For typical rare earth compounds, n is 3/2 for oxides and is 3 for chlorides and fluorides. The coefficient m is the stoichiometric amount of X required in the …
Rare Earth Chlorides
Scandium Chloride Powder, Yttrium Chloride Powder, Lanthanum Chloride, Cerium Chloride, Praseodymium Chloride, Neodymium Chloride, Samarium Chloride, Europium Chloride, Gadolinium …
Isopiestic determination of the activity coefficients of …
The rare earth chlorides | Journal of Chemical & Engineering Data. RETURN TO ISSUE PREV Article NEXT. Isopiestic determination of the activity coefficients of some aqueous …
Environmentally friendly comprehensive hydrometallurgical method
Case, M. E. et al. Extraction behavior of selected rare earth metals from acidic chloride media using tetrabutyl diglycolamide. Solvent. Extr. Ion Extract. 35(7), 496–506 (2017).
Extraction of rare earth metals (REMs) from chloride …
Present report delt with the studies on complexation of rare earth metals (REMs) present in chloride leach liquor of monazite with phosphoric extractant, di-2-ethylhexyl phosphoric acid (D2EHPA). Further, the co-ordination chemistry was studied by determining the complex formation, its structure and validation with standard …
Boosting the extraction of rare earth elements from chloride medium …
In addition, three weakly coordinating rare-earth chloride ions were involved in the rare-earth-containing complex according to the electroneutrality principle. Therefore, the extraction mechanism of Y(III) by ILs could be represented by the following equations: (10) Y aq 3 + + 1.5 N 444 Bn MA org + 3 Cl aq − = N 444 Bn 1.5 Y MA 1.5 Cl 3 org ...
Processes | Free Full-Text | Solubility of Rare Earth Chlorides …
The solubility in triple water-salt systems containing NdCl3, PrCl3, YCl3, TbCl3 chlorides, and water-soluble fullerenol C60(OH)24 at 25 °C was studied by isothermal saturation in ampoules. The analysis for the content of rare earth elements was carried out by atomic absorption spectroscopy, for the content of fullerenol—by electronic …
Rare Earth Element Reduction to Metals | SpringerLink
In the MSE process, a rare earth compound (usually a chloride, fluoride or an oxide) is dissolved in a molten salt medium under an inert atmosphere while an electrical current is circulated through the unit. Historically, the chloride system was favored by the industry; however, intensification imperatives lead to the conversion toward the ...
Clean production of rare earth oxide from rare earth chloride …
Technology of electrical transformation was used for preparation of rare earth oxides from rare earth chloride solution. • La 2 O 3, CeO 2, Nd 2 O 3, Sm 2 O 3, Gd 2 O 3 and Yb 2 O 3 were produced by the cationic membrane electrolysis (CME) method, respectively.. The effects of current density and concentration on the preparation of rare …
Rare Earth Technology in Wastewater Treatment
Rare earth chloride is 100 times less acidic than other coagulants. Rare earth chloride replaces other coagulants with a dose volume 25% or less. These two mechanisms combine to result in a reduction of acid addition of 300-500 times. Rare earth chloride reduces chemical alkalinity consumption by
PREPARATION OF RARE-EARTH CHLORIDE SOLUTIONS
Abstract. A chemical process for preparing solutions of trivalent rare-earth chlorides from sulfate solutions obtained by treating bastnasite concentrate is described. The chief irapurity in the fical solution is cerium, and this element is less than 1 percent of the rare-earth oxides. The solution is used directly in the separation of rare ...
Precipitation transformation of rare earth sulfate into chloride …
Methods for transforming rare earth (RE) sulfate into chloride mainly include extraction process with organophosphonic mono-acids or aliphatic acids and precipitation process with ammonium bicarbonate (NH 4 HCO 3).In this paper, alkylphenoxy carboxylic acids(HAs) of p-dodecylphenoxy acetic acid (HA-I), p-dodecylphenoxypropanoic acid …
Rare earth elements in chloride-rich groundwater, Palo Duro …
Rare earth element (REE) data for groundwater samples from the Deep-Basin Brine aquifer of the Palo Duro Basin, Texas, USA, illustrates the potential use of REE for inferring groundwater flow paths through different geologic materials. The REE content of the groundwaters range over 2.5 orders of magnitude and are depleted by 10 2 to 10 5 ...
Extraction of Rare-Earth Elements from Chloride Solutions …
Abstract The extraction of rare-earth elements (REEs) from chloride solutions (0.01 M HCl + 0.1 M NaCl) in hexane–propanol–water ternary systems using a Cyanex 572 extractant is studied. A change in the component ratio is shown to have a significant effect on both the partition coefficients of REEs and their separation factors. …
Rare Earth Chloride Materials | Rare Earth Chloride Supplier | Rare …
Rare Earth Chloride. Chloride is a salt compound formed by the combination of negatively charged chloride ions and positively charged cations of other elements. Rare earth chlorides are salts formed by the combination of rare earth elements and chlorine. The common rare earth chlorides are YCl3, LaCl3, CeCl3, NdCl3, GdCl3, TbCl3, HoCl3, …
Aqueous Rare-Earth Chloride Solutions
Preparation of Solutions The rare-earth chloride solutions were prepared by dis solution of the appropriate oxide in hydrochloric acid. The rare-earth oxides were obtained from the rare-earth separation group of the Ames Laboratory of the Atomic Energy Commission. Purity of the oxides was established by emission spectro graphic analysis ...
