Extraction of molybdenum with bis(2,4,4-trimethylpentyl)phosphine acid (Cyanex-272)

Knyaz’kina, O. V.; Kuznetsova, G. G.; Travkin, V.F.; Vol'dman, G. M.; Glubokov, Yu. M.

doi:10.3103/s1067821210060040

Cited by 12 publications

(3 citation statements)

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“…In contrast, the corresponding bands due to the POH vibration and POH stretching at 1600–1800 and 1238 cm –1 , respectively, were absent in the spectra of the molybdenum-loaded organic phase. The additional bands at 918 and 951 cm –1 correspond to the symmetric and asymmetric valence vibrations of the MoO bond, respectively …”

Section: Results and Discussionmentioning

confidence: 99%

“…The additional bands at 918 and 951 cm −1 correspond to the symmetric and asymmetric valence vibrations of the MoO bond, respectively. 29 The analysis of Figures 7 and 8 revealed that when the dimeric molecules of bis(2,4,4trimethylpentyl)phosphine acid are complexed with the metal ion, the proton of P−O−H was displaced by the MoO 2 2+ . Thus, following the cation exchange mechanism as…”

Section: Processing Of the Second-mentioning

confidence: 99%

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Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

Srivastava

Kim

2016

Ind. Eng. Chem. Res.

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A preliminary study on the hydrometallurgical recovery of rhenium from an engine-reverted superalloy, CMSX-4, was performed. The novelty of this work dealt with (i) the applicability of electro-generated Cl2 in rhenium leaching and (ii) the maneuvering of the organic extractants based on the metal speciation in leach liquor. In a two-step HCl leaching, more than 98% rhenium was selectively leached in the presence of dissolved chlorine (Cl2aq. and Cl3aq. –) in the second step, which was performed after a leaching of thermal-barrier and base-alloy elements in 4 mol L–1 HCl. The leaching kinetics of rhenium indicated a shift from surface diffusion to a chemically controlled reaction with a variance in temperature from 313 to 353 K. The first use of phosphinic acid in molybdenum separation from rhenium in the leach liquor yielded a high separation value (βMo/Re = 839) using 0.067 mol L–1 extractant; whereas the mixed-phosphine oxides showed a tremendous selectivity for separating rhenium from the base-metal impurities in the Mo-depleted solution. The extraction of rhenium increased from 9% to 98% with an increase in extractant concentration from 0.005 to 0.08 mol L–1 in the organic phase. On a metal-to-metal basis, the recovery value of 93% rhenium as NH4ReO4 (9.5 g L–1 Re in the solution) demonstrated the potential of the present process.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Processing Of the Second-mentioning

confidence: 99%

Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

Srivastava

Kim

2016

Ind. Eng. Chem. Res.

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“…Molybdenum is one of the precious and strategic elements in the world that is found with copper in nature [1]. It is one of the most in-demand rare elements [2]. Vanadium has important usages in the steel industry because of the high melting point, abrasion resistance and high tensile strength [3].…”

Section: Introductionmentioning

confidence: 99%

Extraction of Molybdenum (VI) and Vanadium (V) from Nitrate Solutions Using Coupling of Acid and Solvating Extractants (RESEARCH NOTE)

Asadollahzadeh

Shakib

Torab‐Mostaedi

et al. 2019

IJE

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A B S T R A C TIn this study, solvent extraction method has been utilized for separation of molybdenum and vanadium from nitrate solution by utilizing coupling of acid and solvating extractants (D2EHPA and TBP extractants). The outcomes demonstrated that synergistic solvent extraction improves stability of formatted complexes for transfer to the organic phase. The main parameters such as pH value, concentration of extractants, NH4OH concentration as the stripping agent and contact time were optimized at 0.4, 15% (v/v) D2EHPA, 10% (v/v) TBP, 2 M and 30 min, respectively. The maximum separation factor of 24.84 was obtained with a new synergistic mixture of D2EHPA and TBP diluted with kerosene. According to McCabe-Thiel diagram, more than 99% of the Mo (VI) was obtained in counter current procedure and three stage numbers using 15% (v/v) D2EHPA and its mixture with 10% (v/v) TBP in kerosene, initial aqueous pH value equal to 0.4 and A/O ratio of 4/1 at room temperature for 30 min. In addition, stripping of Mo (VI) reached 98.75% in three counter current stages using 2 M NH4OH as stripping agent and A/O ratio of 1/4 for 30 min.

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Selective Separation of Molybdenum from Leaching Solution of Spent Catalyst by Solvent Extraction with TBP

Shi

Huang

Han

et al. 2022

The Minerals, Metals &Amp; Materials Series

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Extraction of molybdenum with bis(2,4,4-trimethylpentyl)phosphine acid (Cyanex-272)

Cited by 12 publications

References 0 publications

Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

Extraction of Molybdenum (VI) and Vanadium (V) from Nitrate Solutions Using Coupling of Acid and Solvating Extractants (RESEARCH NOTE)

Selective Separation of Molybdenum from Leaching Solution of Spent Catalyst by Solvent Extraction with TBP

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