Solvent extraction of niobium(V) and tantalum(V) from fluorometallate acid solutions

Mayorov, V.G.; Nikolaev, A. I.

doi:10.1016/0304-386x(95)00018-c

Cited by 21 publications

(5 citation statements)

References 2 publications

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“… 75 Mayorov and Nikolaev reported octanol (OCL)-based extraction from 2 M H 2 SO 4 in the presence of up to 2.4 M HF resulting in a β Nb/Ta value of ∼0.19, i.e., better extraction of Ta as compared to that of Nb. 76 In a separate report, a TBP- and OCL-based solvent when used against aqueous phases of 15.9 N HF and mixture of 6 N H 2 SO 4 + NH 4 F.HF resulted in β Nb/Ta values of ∼0.98 and 0.82, respectively. 77 , 78 …”

Section: Resultsmentioning

confidence: 97%

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%

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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“…Очистка фторотанталовой кислоты эффективно проводится с испольованием метода жидкостной экстракции из растворов с низким содержанием серной и плавиковой кислот (H2SO4 -100-200 г/л, HFсвоб. -не более 20-30 г/л) [2][3][4][5]. С учетом этих условий были подобраны параметры вскрытия, обеспечивающие достаточный переход тантала в раствор с получением раствора, пригодного для осуществления жидкостной экстракции (химический состав растворов допускает проводить процесс селективной экстракции тантала с помощью выбранного экстрагента -октанол-1).…”

Section: экстракционная очистка фторотанталовой кислотыunclassified

Pilot and industrial testing of the extraction technology for obtaining tantalum oxide from tantalum-containing residues

Povetkin¹,

Novikov²,

Smirnov³

et al. 2023

TKSC RAS

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This paper presents the results of testing the sulfate-fluoride extraction technology for obtaining tantalum oxide from tantalum-containing residues. The scheme of extraction purification of fluorotantalic acid from the solution obtained after fluoride-sulfate opening of iron-titanium cake is shown. The modes of extraction purification of fluorotantalic acid, the content of tantalum in the raffinate and re-extract are shown.

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“…traction process. [11][12][13][14][15][16] In this process (Fig. 2), ore concentrates containing a minimum of 25% tantalum and niobium pentoxide are chemically decomposed in a hydrofluoric acid medium.…”

Section: Marignac's Processmentioning

confidence: 99%

Processing of Ta2O5 powders for electronic applications

Singh

2001

Journal of Elec Materi

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The XRD analysis was performed on a Rigaku (Tokyo, Japan) Geigerflex D-Max B automated system with a Cu K␣ 1 (1.540562 Å) radiation. Pressed powdered samples were scanned in 4-100°2 ranges. Jade 3.1 software (Materials Data Inc., Livermore, CA) was used to fit and subtract background, to perform a 2 calibration, and to identify peaks. Scanning Electron MicroscopySamples were carefully mounted on Al studs coated with Au/Pd and analyzed by an AMRAY (Bedford, MA) 1830 SEM system at different magnifications. Glow Discharge Mass SpectrometryA VG Microtrace Ltd. (Winsford, Cheshire, England) model VG 9000 GDMS was used for the quantitative elemental analysis. BET Particle Size MeasurementsA Beta Scientific (Albertson, NY) model 4203 BET-particle size analyzer was used for the surface area measurements.The particle size, surface area, morphology, and purity of tantalum pentoxide are critical for some of its applications in the manufacture of several electronic products. Although the purity of different grades of Ta 2 O 5 , such as standard technical grade, carbide grade, and optical grade, have been well documented, there is no report on the morphology and other surface characteristics of Ta 2 O 5 powders. The objective of this paper is to review various methods and recent developments in the processing of tantalum oxide powders. The other objective of this paper is to report on the morphology, particle size, and surface area of tantalum oxide obtained from different methods of preparation. The work reported in this paper will be useful for researchers involved in the development of tantalum-related electronic materials.

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Solvent extraction of niobium(V) and tantalum(V) from fluorometallate acid solutions

Cited by 21 publications

References 2 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

Pilot and industrial testing of the extraction technology for obtaining tantalum oxide from tantalum-containing residues

Processing of Ta2O5 powders for electronic applications

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