scholarly journals Environmentally friendly comprehensive hydrometallurgical method development for neodymium recovery from mixed rare earth aqueous solutions using organo-phosphorus derivatives

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Verónica Cristina Arellano Ruiz ◽  
Rambabu Kuchi ◽  
Pankaj Kumar Parhi ◽  
Jin-Young Lee ◽  
Rajesh Kumar Jyothi
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Method Development ◽  
Neodymium Oxide ◽  
Selective Extraction ◽  
Extractant Concentration ◽  
Cyanex 272 ◽  
Extraction Behavior ◽  
Technology Applications ◽  
Hydrometallurgical Method

Abstract Rare earth elements (REEs) have obtained a greatest significant in human lives owing to their important roles in various high technology applications. The present method development was deal technology important REEs such as neodymium, terbium and dysprosium, selective extraction with possible separation and recovery studies, successfully. The chloride mediated mixed aqueous solution containing 1500 mg/L each of REEs such as Nd, Tb and Dy was subjected at selective separation of Nd from other associated REEs. Three organo-phosphorous based commercial extracting agents such as Cyanex 272, PC 88A and D2EHPA, were employed for the extraction, possible separation and recovery of rare earth elements. A comparative extraction behavior of all these three extractants as function of time, pH influence, extractant concentration, temperature and diluents were systematically investigated. The extraction tendency of organo-phosphorus reagents towards the extraction of either of the REEs follows of the sequence as: D2EHPA > PC 88A > Cyanex 272. The thermodynamic behavior of either of the extractants on liquid–liquid extraction processing of REEs was investigated and thermodynamic calculations were calculated and presented. Substantial recovery of neodymium oxalate followed by its calcined product as neodymium oxide was ascertained from XRD study and SEM–EDS analysis.

scholarly journals Adsorption of Rare Earth Elements from Aqueous Solutions Using Geopolymers

Proceedings ◽  
2018 ◽  
Vol 2 (10) ◽  
pp. 567 ◽  
Author(s):  
Željka Fiket ◽  
Ana Galović ◽  
Gordana Medunić ◽  
Martina Furdek Turk ◽  
Maja Ivanić ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Aqueous Solutions ◽  
High Efficiency ◽  
Low Cost ◽  
Coal Ash ◽  
Industrial Sector ◽  
Efficient Removal ◽  
Model Solutions ◽  
Technology Applications

Rare earth elements, i.e., lanthanides, are important components of many recently developed technology applications. However, their increasing use in the industrial sector, medicine, and agriculture over the last few decades has provided them with the title of “new pollutants”. Different methods are now applied for the removal of various pollutants from wastewaters, whereby the emphasis is placed on adsorption due to its simplicity, high efficiency, and low cost. In the present study, geopolymers prepared from coal ash were examined regarding their capacity for the adsorption of lanthanides from model solutions. The obtained results indicate the efficient removal of lanthanides by prepared geopolymers, depicting them as effective adsorbents for this group of elements.

Selective Extraction of Thorium from Rare Earth Elements Using Wrinkled Mesoporous Carbon

2018 ◽  
Vol 140 (44) ◽  
pp. 14735-14739 ◽  
Author(s):  
Zijie Wang ◽  
Alexander T. Brown ◽  
Kui Tan ◽  
Yves J. Chabal ◽  
Kenneth J. Balkus
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mesoporous Carbon ◽  
Selective Extraction

scholarly journals A biosorption-based approach for selective extraction of rare earth elements from coal byproducts

2020 ◽  
Vol 241 ◽  
pp. 116726 ◽  
Author(s):  
Dan Park ◽  
Andrew Middleton ◽  
Ryan Smith ◽  
Gauthier Deblonde ◽  
Dan Laudal ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Selective Extraction

Effect of diluents on extraction behavior of rare earth elements with N,N,N′,N′-tetrabutyl-3-oxy-glutaramide from hydrochloric acid

2012 ◽  
Vol 121-124 ◽  
pp. 16-21 ◽  
Author(s):  
Yu Cui ◽  
Jinhong Yang ◽  
Guang Yang ◽  
Guangming Xia ◽  
Yong Nie ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrochloric Acid ◽  
Rare Earth Elements ◽  
Extraction Behavior

scholarly journals Extraction of Sm(III)and Nd(III) with N,N,N’,N’-tetrabutyl-3-oxy-diglycolamidefrom hydrochloric acid

2013 ◽  
Vol 78 (1) ◽  
pp. 93-100 ◽  
Author(s):  
J.H. Yang ◽  
Y. Cui ◽  
G.X. Sun ◽  
Y. Nie ◽  
G.M. Xia ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrochloric Acid ◽  
Ir Spectra ◽  
Acid Concentration ◽  
Distribution Ratio ◽  
Hydrochloric Acid Concentration ◽  
Extractant Concentration ◽  
Extraction Mechanism ◽  
Extraction Behavior ◽  
Loaded Organic Phase

The extraction behavior of Sm(III) and Nd(III) with N,N,N?,N?-tetrabutyl-3-oxa-diglycolamide (TBDGA) in 70% kerosene-30% n-octanol from hydrochloride acid wasstudied. The effect of hydrochloric acid concentration, extractant concentration,and temperature on the distribution of rare earth elementswas investigated. The extraction mechanism was established and the stoichiometry of the main extracted species was confirm to be SmCl3?2TBDGA and NdCl3?2TBDGA for Sm(III) and Nd(III), respectively. The extraction distribution ratio decreases with an increase in temperature, which demonstrates that the extraction reaction is exothermic. The IR spectra of the loaded organic phase and free extractant were recorded and discussed.

scholarly journals Rare Earth Elements in the Lignite Ash Determination Method Development

2016 ◽  
Vol 9 (8) ◽  
pp. 1238-1246
Author(s):  
Oleg I. Podkopaev ◽  
◽  
Ekaterina S. Balakchina ◽  
Svetlana A. Kopytkova ◽  
Vladimir N. Losev ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Method Development ◽  
Determination Method

scholarly journals Increasing the depth of apatite processing by extracting rare-earth elements

2021 ◽  
Vol 266 ◽  
pp. 02002
Author(s):  
E.S. Lukyantseva ◽  
V.V. Sergeev
Keyword(s):  
Rare Earth ◽  
Phosphoric Acid ◽  
Rare Earth Elements ◽  
Extraction Process ◽  
Extractant Concentration ◽  
Wet Process ◽  
Heavy Rare Earth Elements ◽  
Knowledge Intensive ◽  
The Impact ◽  
Method Of Extraction

Currently, most high-technology productions are impossible without rare-earth elements (REE). The heavy rare-earth elements are of great interest as they have the highest market value and are in demand in the vast majority of knowledge-intensive industries. The main recourse of REE in Russia is apatite ore which is used in the production of fertilizers. As a result of its leaching, about 15-20% of REE goes to wet-process phosphoric acid. To enhance the depth of apatite processing, it is necessary to develop a technology which will allow obtaining rare-earth elements as by-products. The method of extraction and concentration of REE discussed in this paper was conducted by using the extractant based on di-(2-ethylhexyl) phosphoric acid (D2EHPA). The mechanism of extraction was studied, as well as the impact of the extractant concentration, phase ratio and the number of stages on the extraction process.

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