scholarly journals Increasing the efficiency of rare earth metal recovery from technological solutions during processing of apatite raw materials

2021 ◽  
Vol 252 ◽  
pp. 1-10
Author(s):  
Maria Ponomareva ◽  
Olga Cheremisina ◽  
Yulia Mashukova ◽  
Elena Lukyantseva
Keyword(s):  
Rare Earth ◽  
Sulfuric Acid ◽  
Ion Exchange ◽  
Anion Exchanger ◽  
Raw Materials ◽  
Earth Metal ◽  
Mass Action ◽  
Exchange Equilibrium ◽  
Static Conditions ◽  
Sulfate Complexes

The issues of complex processing of mineral resources are relevant due to the depletion of available raw materials. So, it is necessary to involve technological waste, generated during the processing of raw materials, to obtain valuable components. In the process flow of apatite concentrate treatment using the sulfuric acid method, a large amount of phosphogypsum is produced with an average content of light rare earth metals (REMs) reaching 0.032-0.45 %. When phosphogypsum is treated with sulfuric acid solutions, a part of REMs is transferred to the sulfate solution, from which it can be extracted by means of ion exchange method. The study focuses on sorption recovery of light REMs (praseodymium, neodymium and samarium) in the form of anionic sulfate complexes of the composition [ln(SO4)2]– on polystyrene anion exchanger AN-31. The experiments were performed under static conditions at a liquid-to-solid ratio of 1:1, pH value of 2, temperature of 298 K and initial REM concentration in the solutions ranging from 0.83 to 226.31 mmol/kg. Thermodynamic description of sorption isotherms was carried out by the method based on linearization of the mass action equation, modified for the ion exchange reaction. As a result of performed calculations, the authors obtained the constants of ion exchange equilibrium for Pr, Nd and Sm, as well as the values of the change in the Gibbs energy for the ion exchange of REM sulfate complexes on the AN-31 anion exchanger and the values of total capacity of the anion exchanger. Calculated separation factors indicated low selectivity of AN-31 anionite exchanger for light REMs; however, the anion exchanger is suitable for effective recovery of a sum of light REMs. Based on the average value of ion exchange equilibrium constant for light REMs, parameters of a sorption unit with a fluidized bed of anion exchanger were estimated.

Improving the Cd2+ detection capability of a new anionic rare earth metal–organic framework based on a [RE6(μ3-OH)8]10+ secondary building unit: an ion-exchange approach towards more efficient sensors

2020 ◽  
Vol 5 (6) ◽  
pp. 1077-1087 ◽  
Author(s):  
Nikos Panagiotou ◽  
Kasiani Evangelou ◽  
Athanasia Psalti ◽  
Nektaria Varnava ◽  
Giasemi K. Angeli ◽  
...  
Keyword(s):  
Rare Earth ◽  
Ion Exchange ◽  
Metal Ion ◽  
Metal Organic Framework ◽  
Earth Metal ◽  
Secondary Building Unit ◽  
Exchange Method ◽  
Building Unit ◽  
Ion Sensing ◽  
New Family

A new family of microporous anionic rare earth (RE) MOFs based on a hexanuclear (RE)6 secondary building unit along with a post-synthetic ion-exchange method to enhance the metal ion sensing capability of anionic MOFs are reported.

Cathodes based on rare-earth metal nickelate ferrites prepared from industrial raw materials for solid oxide fuel cells

2014 ◽  
Vol 50 (6) ◽  
pp. 548-553 ◽  
Author(s):  
I. Yu. Yaroslavtsev ◽  
N. M. Bogdanovich ◽  
G. K. Vdovin ◽  
T. A. Dem’yanenko ◽  
D. I. Bronin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Rare Earth Metal ◽  
Raw Materials ◽  
Earth Metal ◽  
Solid Oxide ◽  
Oxide Fuel

scholarly journals Prediction of ternary ion-exchange equilibrium using artificial neural networks and Law of Mass Action

2012 ◽  
Vol 34 (1) ◽  
Author(s):  
Rafael Luan Sehn Canevesi ◽  
Elizeu Avelino Zanella Junior ◽  
Rodrigo Augusto Barella ◽  
Tiago Dias Martins ◽  
Marcos Flávio Pinto Moreira ◽  
...  
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Ion Exchange ◽  
Mass Action ◽  
Exchange Equilibrium ◽  
Law Of Mass Action ◽  
Artificial Neural

scholarly journals The Kinetic Aspects of the Dissolution of Slightly Soluble Lanthanoid Carbonates

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1793
Author(s):  
‪Tatiana Litvinova ◽  
Ruslan Kashurin ◽  
Ivan Zhadovskiy ◽  
Stepan Gerasev
Keyword(s):  
Activation Energy ◽  
Rare Earth ◽  
Raw Materials ◽  
Earth Metal ◽  
Dissolution Process ◽  
Complexing Agent ◽  
System Temperature ◽  
Reaction Orders ◽  
Technogenic Raw Materials ◽  
Degree Of Extraction

The problem of the complex use of mineral raw materials is significant in the context of many industries. In the rare earth industry, in the context of limited traditional domestic reserves and dependence on imports of lanthanides, an unambiguous and comprehensive solution has not yet been developed. Promising areas include the involvement of technogenic raw materials in the industrial turnover. The present study examines the kinetics of the dissolution process of poorly soluble lanthanide compounds when changing the parameters of the system. The results obtained reflect the dependence of the degree of extraction of lanthanide on the following variable parameters of the system: temperature, concentration of the complexing agent, and intensity of mixing. On the basis of the experiment, the values of the activation energy and the reaction orders were calculated. The activation energy of the carbonate dissolution process, in kJ/mol, was as follows: 61.6 for cerium, 39.9 for neodymium, 45.4 for ytterbium. The apparent reaction orders of the carbonates are equal to one. The prospect of using the research results lies in the potential to create a mathematical model of the process of extracting a rare earth metal by the carbonate alkaline method.

scholarly journals Justification of the prospects of using phosphatotitanium ion exchangers for extracting rare earth metals from solutions of radionuclides

2019 ◽  
Vol 59 (9) ◽  
pp. 58-65
Author(s):  
Vladimir I. Ivanenko ◽  
◽  
Roman I. Korneykov ◽  
Nikita V. Zharov ◽  
◽  
...  
Keyword(s):  
Rare Earth ◽  
Ion Exchange ◽  
Rare Earth Element ◽  
Rare Earth Metal ◽  
Earth Element ◽  
Earth Metal ◽  
Metal Cations ◽  
Sorption Properties ◽  
Ion Exchangers ◽  
Hydrated Titanium

The results of a study of the sorption properties of ion-exchange materials based on hydrated titanium (IV) oxohydroxophosphates with respect to rare-earth metal cations are presented in this paper. A high affinity of the latters for the sorption matrix in nitrate media was established, which is determined by the ion radius of the sorbate and increases in the series Y3+  Gd3+  Eu3+ Sm3+ Nd3+ Ce3+ at pH=4 and La3+  Ce3+  Y3+  Yb3+ at pH=1.5 for all the studied sample compositions. It was experimentally shown that the doping of sorbents based on titanium (IV) oxyhydroxophosphates with zirconium (IV) cations, which differs from titanium (IV) in acid-base properties, leads to an increase in the sorption properties of ion exchangers, which allows the use of modified compositions for sorption of rare-earth metal cations from solutions with high acidity. It was established that partial dehydration of the sorption matrix and increase in temperature increase the sorption ability of ion-exchange materials. Sorption extraction of rare-earth element cations by sorbents of various compositions was carried out from solutions simulating real technological objects generated during the processing of nuclear fuel waste. It is shown that sorption materials based on hydrated titanium (IV) oxohydroxophosphates are promising ion exchangers for the extraction of rare-earth element cations from technological solutions with complex chemical composition. It was established that unmodified sorbent compositions are promising for the selective extraction of rare-earth element cations, while modified compositions are of interest for group sorption. The thermal treatment of a sorbent saturated with radioisotopes leads to the formation of crystalline insoluble mineral-like compounds, which ensures reliable immobilization of the sorbed components during long-term storage of the spent product.

Ion exchange equilibria of arsenic in the presence of high sulphate and nitrate concentrations

2005 ◽  
Vol 5 (5) ◽  
pp. 67-74 ◽  
Author(s):  
R. Baciocchi ◽  
A. Chiavola ◽  
R. Gavasci
Keyword(s):  
Ion Exchange ◽  
Equilibrium Constants ◽  
Exchange Process ◽  
Quantitative Description ◽  
Mass Action ◽  
Exchange Equilibrium ◽  
Resin Phase ◽  
Ion Exchange Process ◽  
Mass Action Law ◽  
Anionic Resin

The aim of this work was to develop a quantitative description of the ion exchange equilibria of arsenic on a strong anionic resin, in the presence of nitrates and sulphates. First, the ion exchange equilibrium data of As(V) and NO3− on a strong anionic resin in chloride form were obtained and described with a model based on the mass action law. Namely, assuming ideal behaviour for both solution and resin phase, the thermodynamic constant of the As(V)/Cl− and NO3−/Cl− ion exchange equilibria were estimated by fitting of experimental data. Then, these equilibrium constants were used to predict the ion exchange behaviour of the ternary system As(V)/NO3−/Cl−, providing a rather good agreement with experimental results. The ion exchange equilibria involving sulphate ions were also studied, showing a very high affinity to the resin phase. This behaviour did not allow a quantitative robust modelling of the equilibrium pattern. The results discussed in this paper represent a first step toward the development of a comprehensive modelling of the ion exchange process for the removal of As(V) from surface and groundwater in the presence of competitive, naturally occurring anions.

scholarly journals Sorption of rare earth coordination compounds

2020 ◽  
Vol 244 ◽  
pp. 474-481
Author(s):  
Olga Cheremisina ◽  
Elizaveta Cheremisina ◽  
Maria Ponomareva ◽  
Аleksander Fedorov
Keyword(s):  
Rare Earth ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Coordination Compounds ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Equilibrium Constants ◽  
Mass Action ◽  
Dynamic Capacity ◽  
Nitrate Solutions

Rare earth elements (REEs) are valuable and strategically important in many high-technology areas, such as laser technology, pharmacy and metallurgy. The main methods of REE recovery are precipitation, extraction and sorption, in particular ion exchange using various sorbents, which allow to perform selective recovery and removal of associated components, as well as to separate rare earth metals with similar chemical properties. The paper examines recovery of ytterbium in the form of coordination compounds with Trilon B on weakly basic anion exchange resin D-403 from nitrate solutions. In order to estimate thermodynamic sorption parameters of ytterbium anionic complexes, ion exchange process was carried out from model solutions under constant ionic strength specified by NaNO3, optimal liquid to solid ratio, pH level, temperatures 298 and 343 K by variable concentrations method. Description of thermodynamic equilibrium was made using mass action law formulated for ion exchange equation and mathematically converted to linear form. Values of equilibrium constants, Gibbs free energy, enthalpy and entropy of the sorption process have been calculated. Basing on calculated values of Gibbs energy, a sorption series of complex REE ions with Trilon B was obtained over anion exchange resin D-403 from nitrate solutions at temperature 298 K. Sorption characteristics of anion exchange resin have been estimated: total capacity, limiting sorption of complex ions, total dynamic capacity and breakthrough dynamic capacity.

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