scholarly journals The study of the selective rhenium solvent extraction possibility with the mixture of aliphatic alcohol and ketone from acid solutions of rhenium-containing wastes processing

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 83-86
Author(s):  
A. M. Dvornikova ◽  
◽  
A. G. Kasikov ◽  
Keyword(s):  
Solvent Extraction ◽  
Acid Chloride ◽  
Aliphatic Alcohol ◽  
Molybdenum Content ◽  
Acid Solutions ◽  
High Acid ◽  
Separation Factors

The results of rhenium (VII) solvent extraction with synergistic mixtures of octyl alcohol and ketone from the high acid chloride and sulphate solutions with high accompanying metals (platinum and molybdenum) content, obtained from leaching of rhenium-containing wastes, were presented. It is shown that synergistic coefficients at rhenium solvent extraction by mixtures of 30–50 % v/v 2-octanol in 2-octanone were not exceeded 1.2–1.3. However, such mixtures recovered fewer impurities of Pt (IV) and Mo (VI), and the separation factors reached 16.0 and 573.2. Besides, mixtures of alcohol and ketone are characterized by higher rhenium (VII) capacity than the alcohol alone.

scholarly journals Synergistic extraction of rhenium (VII) with mixtures of high-aliphatic alcohols and ketones from sulphuric acid media.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 51-54
Author(s):  
A. M. Dvornikova ◽  
◽  
A. G. Kasikov ◽  
Keyword(s):  
Solvent Extraction ◽  
Synergistic Effect ◽  
Sulphuric Acid ◽  
Extraction Efficiency ◽  
Aliphatic Alcohols ◽  
Synergistic Extraction ◽  
Acid Solutions ◽  
Acid Media ◽  
High Acid ◽  
Wide Range

Rhenium(VII) solvent extraction with synergistic mixtures of neutral extractants (octyl alcohols and ketones) from sulphuric acid media has been investigated. It was observed that the synergistic effect appeared under solvent extraction from high acid solutions, consisting ≥ 5 mol/L H2SO4.The synergistic coefficients were up to 2–2,3 providing 97,5–98,7% rhenium(VII) extraction efficiency at one SX step. High rhenium(VII) SX efficiency maintained in the wide range of extraction mixtures compositions (10–50 % v/v of ketone).

scholarly journals Neptunium extraction by N,N-dialkylamides

2020 ◽  
Vol 108 (9) ◽  
pp. 707-716
Author(s):  
Jarrod M. Gogolski ◽  
Peter R. Zalupski ◽  
Travis S. Grimes ◽  
Mark P. Jensen
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Radioactive Waste ◽  
Partial Oxidation ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Organic Solutions

AbstractSeparation of neptunium by solvent extraction has been based on tributylphosphate (TBP) for decades, but TBP is not fully incinerable, which adds to the burden of long-lived radioactive waste. Alternatives to TBP for uranium and plutonium extraction, such as the N,N-diakylamides, previously have been explored in the hopes of transitioning to an extractant that is incinerable. Four N,N-diakylamides, N,N-dihexylhexanamide (DHHA), N,N-dihexyloctanamide (DHOA), N,N-di(2-ethylhexyl)butanamide (DEHBA), and N,N-di(2-ethylhexyl)-iso-butanamide (DEHiBA) were considered in this work for their potential to extract millimolar concentrations of Np(IV), Np(V), and Np(VI) from nitric acid solutions into organic solutions containing 1 M extractant in Exxsol D60. Under these conditions the branching of the alkyl substituents affects the extractability of Np(VI) and Np(IV), causing three of the dialkylamides, DHHA, DHOA and DEHBA, to extract neptunium in the expected order Np(VI) > Np(IV) > > Np(V). In contrast, branched DEHiBA is so poor an extractant for Np(IV) that the extraction order becomes Np(VI) > > Np(V) > Np(IV) between 0.1 and 5.6 M HNO3 due to partial oxidation of the Np(V) in nitric acid.

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

scholarly journals Recovery of boron from brines with high magnesium content by solvent extraction using aliphatic alcohol

RSC Advances ◽  
2021 ◽  
Vol 11 (26) ◽  
pp. 16096-16105
Author(s):  
Zhenya Xu ◽  
Hui Su ◽  
Jian Zhang ◽  
Wensen Liu ◽  
Zhaowu Zhu ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Aliphatic Alcohol ◽  
Salt Lake ◽  
Magnesium Content ◽  
Extraction System ◽  
Commercial Application ◽  
Simulation Process ◽  
Multi Stage ◽  
Counter Current ◽  
High Magnesium Content

The multi-stage counter-current simulation process showed an extraction system with great potential for commercial application in boron recovery from salt lake brines with high magnesium content.

Separation of iron from zirconium in concentrated hydrochloric acid solutions by solvent extraction

1986 ◽  
Vol 17 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Chih-Chien Chang ◽  
Tai-Ming Chiu ◽  
Ying-Chu Hoh ◽  
Wei-Ko Wang
Keyword(s):  
Solvent Extraction ◽  
Hydrochloric Acid ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions

Enhanced extraction and separation of zirconium(IV) and hafnium(IV) with 3-phenyl-4-benzoyl-5-isoxazolone in presence of various neutral organophosphorus extractants

2007 ◽  
Vol 95 (5) ◽  
Author(s):  
K. Janardhan Reddy ◽  
A. Varada Reddy ◽  
B. S. Shaibu ◽  
M. L. P. Reddy
Keyword(s):  
Solvent Extraction ◽  
Hydrochloric Acid ◽  
Acid Solutions ◽  
Extraction And Separation ◽  
Extraction Behavior ◽  
Hydrochloric Acid Solutions ◽  
Organophosphorus Extractants

Various 3-phenyl-4-aroyl-5-isoxazolones, namely, 3-phenyl-4-benzoyl-5-isoxazolone (HPBI), 3-phenyl-4-(4-fluorobenzoyl)-5-isoxazolone (HFBPI) and 3-phenyl-4-(4-toluoyl)-5-isoxazolone (HTPI) were synthesized and examined with regard to the solvent extraction behavior of Zr(IV) and Hf(IV) from hydrochloric acid solutions. The results demonstrated that Zr(IV) and Hf(IV) extracted into chloroform with 3-phenyl-4-aroyl-5-isoxazolones (HA), as ZrOA

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