Characterization of REE-Nb ores by a combination of spectrochemical techniques

Серегина, И. Ф.; Волков, А. И.; Ossipov, Konstantin; Bolshov, M.A.

doi:10.1016/j.sab.2018.06.018

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The Nb amount was monitored using the K α ray at 16.594 keV, whereas, for Ta, the L α line at 8.114 keV was chosen. 53 , 54 From the spectra, it was clear that the leftover Nb or Ta present in the aqueous phase after their extraction roughly followed the trend: C Nb C4mimNTf2 < C Nb C8mimNTf2 < C Ta C4mimNTf2 < C Ta C8mimNTf2 .…”

Section: Resultsmentioning

confidence: 97%

“…Figure d shows the typical EDXRF spectra of the aqueous phase prior and after the extraction of Nb and Ta using 100 mM of the FIL in C 4 mim·NTf 2 and C 8 mim·NTf 2 . The Nb amount was monitored using the K α ray at 16.594 keV, whereas, for Ta, the L α line at 8.114 keV was chosen. , From the spectra, it was clear that the leftover Nb or Ta present in the aqueous phase after their extraction roughly followed the trend: C Nb C4mimNTf2 < C Nb C8mimNTf2 < C Ta C4mimNTf2 < C Ta C8mimNTf2 .…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Goyal,

Sengupta,

Mohapatra

2023

ACS Omega

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A 'green' single-step separation process, involving a phosphonium phosphinate functionalized ionic liquid (FIL) in C 8 mim•NTf 2 , has been developed for highly encouraging improvements in the mutual separation of Nb and Ta with a maximum separation factor of ∼48 at 2 M nitric acid. The separation factor in C 4 mim•NTf 2 was found to be somewhat lower compared to that seen in C 8 mim•NTf 2 . In C 8 mim•NTf 2 , the extraction proceeded via the neutral NbOF 3 (R 4 P + )(R 2 POO − ) and TaOF 3 (R 4 P + )(R 2 POO − ) species predominated by a 'solvation' mechanism at 2 M HNO 3 , where both the cationic and anionic parts of the FIL took part in the metal ion extraction. However, in the case of C 4 mim•NTf 2 , the extraction proceeded via a cation exchange mechanism involving the mono-positive species viz.Only the phosphinate group of the FIL was directly involved in the binding to the metal ion. The charge neutrality was maintained by the exchange of the C 4 mim + ion from the ionic liquid phase to the aqueous phase. The processes were spontaneous, exothermic involving outer sphere complexation. The radiolytic stabilities of the C 8 mim•NTf 2 -based solvent systems were poorer than those of the solvents based on C 4 mim•NTf 2 . Aqueous solutions of EDTA-guanidine carbonate or DTPA-guanidine carbonate showed promising back extraction ability though three contacts of these organic phases were required for more than 99.99% stripping of the metal ion. The reusability of these solvent systems was evaluated. After four consecutive cycles, a maximum of only 8% reduction in the extraction efficiency of Ta was noticed, while for Nb it was less than 4% for Nb.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Goyal,

Sengupta,

Mohapatra

2023

ACS Omega

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“…There are majorly three ways to solve the problem caused by spectral interferences. One is the mathematic correction based on the ratio of the signal intensity of an interfering polyatomic ion (for example, 137 Ba 16 O + ) to that of an interferent ion (for example, 137 Ba + ) ( Seregina et al, 2018 ; Zhao et al, 2019 ; Carvalho et al, 2020 ; Kunzetsova et al, 2021 ). Mathematic correction is a straightforward way of canceling spectral interferences in the measurements by ICP-MS.…”

Section: Introductionmentioning

confidence: 99%

Determination of Rare Earth Elements by Inductively Coupled Plasma–Tandem Quadrupole Mass Spectrometry With Nitrous Oxide as the Reaction Gas

Zhu

2022

Front. Chem.

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Nitrous oxide (N2O) was investigated as the reaction gas for the determination of rare earth elements (REEs) by inductively coupled plasma–tandem quadrupole mass spectrometry (ICP-QMS/QMS). The use of N2O as the reaction gas apparently improved the yields of mM16O+ for Eu and Yb in the reaction cell. As a result, the sensitivities for measurement of Eu and Yb were apparently improved in comparison to those obtained with O2 as the reaction gas. A high sensitivity measurement of the whole set of REEs was achieved, providing a typical sensitivity of 300,000 CPS mL/ng for REEs measured with an isotope having isotopic abundance close to 100%. The use of N2O as the reaction gas helped suppress Ba-related spectral interferences with the measurement of Eu, permitting the measurement of Eu in a natural sample without mathematic correction of spectral interferences. The detection limits (unit, pg/mL) for 14 REEs (except for Pm) from La to Lu were 0.028, 0.018, 0.006, 0.026, 0.006, 0.010, 0.017, 0.006, 0.016, 0.010, 0.016, 0.004, 0.023, and 0.012, respectively. The validity of the present method was confirmed by determining REEs in river water-certified reference materials, namely, SLRS-3 and SLRS-4.

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“…Однако ключевую роль в получении точных и достоверных данных играет именно правильно подобранная методика химической пробоподготовки. Высокие содержания РЗЭ и ВЗЭ, например, в рудах определяют напрямую после разложения минеральными кислотами или сплавлением, без дополнительных манипуляций [10][11][12].…”

Section: Introductionunclassified

Influence of Sample Pretreatment on the Analysis of High Contents of Rare-Earth and High Field Strength Elements in Geological Samples by ICP-AES and ICP-MS (Case Study of the Tomtor Deposit)

Saryg-ool

Букреева

Myagkaya

et al. 2020

Journal of Siberian Federal University. Chemistry

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Influence of sample pretreatment on the analysis of the high contents of rare earth (REE) and high field strength (HFSE) elements in geological samples by inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS) was studied. The rocks and rich ores of the Tomtor Nb-REE deposit were explored. Complete dissolution of the geological samples with a high content of “refractory” minerals has been achieved using fusion with a sodium peroxide. The results obtained by ICP-AES and ICP-MS after chemical dissolution are comparable with the results obtained by the XRF-SR without chemical pretreatment

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Characterization of REE-Nb ores by a combination of spectrochemical techniques

Cited by 7 publications

References 21 publications

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Determination of Rare Earth Elements by Inductively Coupled Plasma–Tandem Quadrupole Mass Spectrometry With Nitrous Oxide as the Reaction Gas

Influence of Sample Pretreatment on the Analysis of High Contents of Rare-Earth and High Field Strength Elements in Geological Samples by ICP-AES and ICP-MS (Case Study of the Tomtor Deposit)

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