The chemistry of protactinium—V A comparison of the extraction of protactinium, niobium and tantalum

Casey, A. T.; Maddock, A. G.

doi:10.1016/0022-1902(59)80122-6

Cited by 37 publications

(10 citation statements)

References 20 publications

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“…At low acidities, niobium is partially extracted from all the mineral acid solutions. Since niobium The extraction from hydrochloric acid media increases less rapidly as compared to the other acids and is practically independent of acidity in the range of 0.1 -5.0 M. An increase in the extraction at high acidity is observed because of the chloroniobium complexes [20][21][22][23][24] which are probably extracted as NbOCU. A similar conclusion was reported for Nb-HCl-TBP [25] and Nb-HCl-N-PyOxide [23] systems.…”

Section: Resultsmentioning

confidence: 93%

“…Extraction of Zr(IV) and Nb(V) with TI0A/Variation of distribution coefficient of Zr(IV) and Nb(V), with salt concentration. ·-·-· LiCl (4M HCl); 0-0-0 NaBr (4M HBr); Χ-Χ-Χ NaN03 (4M HN03) For niobium the extraction from weak acidic solution may involve complexes of the type HNb(OH)a(X)b nTIOAwhere X = CI or Br, while the increase in the extraction at high acidities could be attributed to the chloro-and bromo-niobium complexes as mentioned before[20][21].…”

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confidence: 96%

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Solvent Extraction of Zr(IV) and Nb(V) with 1-Phenyl-3-methyl-4-benzoyl-pyrazole-5-one and Tri-iso-octylamine from Different Mineral Acid Solutions.

1981

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The extraction of Zr(IV) and Nb(V) from aqueous solutions of mineral acids with 1 % l-phenyl-3-methyl-4-benzoyl-pyrazole-5-one and 5 % tri-iso-octylamine solutions in chloroform has been investigated respectively. The mechanism of extraction and the composition of the extracted species have been suggested and the effect of complexing and salting-out agents also determined. Separation factors of various metals with respect to niobium have been estimated and separation from zirconium and many other elements has been achieved. Procedures are recommended for the separation of 9! Nb from 9 5 Zr 5 Nb mixture as well as from the fission products.

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Section: Resultsmentioning

confidence: 93%

mentioning

confidence: 96%

Solvent Extraction of Zr(IV) and Nb(V) with 1-Phenyl-3-methyl-4-benzoyl-pyrazole-5-one and Tri-iso-octylamine from Different Mineral Acid Solutions.

1981

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“…So we searched for conditions which elute Pa while retaining Nb on the column. The HF concentrations used to strip protactinium were varied from 0.1 M to 3 M HF in 6 M HCl [7,8,9]. We also varied the HF concentration in a wider ränge with the HCl concentration at 6 M and 9 M. The dependence of the extraction behaviour on the HF concentration is depicted in Fig.…”

Section: Batch Extraction Experimentsmentioning

confidence: 99%

“…The addition of a small amount of HF to the DIBC/HCl system should greatly increase the extraction of Nb and decrease that of Pa [9]. So we searched for conditions which elute Pa while retaining Nb on the column.…”

Section: Batch Extraction Experimentsmentioning

confidence: 99%

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Chemical Properties of Element 105 in Aqueous Solution: Extractions into Diisobutylcarbinol

et al. 1992

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Element 105 / Chemical properties / Halide complex formation / Extraction into a secondary alcohol SummaryStudies of the extraction of element 105 into diisobutylcarbinol (DIBC) from aqueous HBr and HCl solutions wcre performed on "^Ha and "^Ha produced in the "'Bk("0,5n) and reactions at a beam energy of 99 MeV. The Ha isotopes were detected by measuring the fission and a activities associated with their decay and the a-decays of their daughters, 4-s and 6-s ^''Lr. Complete extraction-elution cycles were performed on a one-minute time scale by the computer-controlled liquid chromatography apparatus, ARCA II, using reversed-phase micro-chromatographic columns incorporating DIBC on an inert support. Stimulated by the previously observed similarity of the aqueous-phase chemistry of element 105 to that of niobium and protactinium, the extraction, from concentrated HBr, was followed by the elution of a Nb fraction in 6 M HCl/ 0.0002 M HF, and a Pa fraction in 0.5 M HCl. The number of 262,263j^^ dccays observed in the Nb fraction indicated that less than 45% of the Ha was extracted into DIBC from concentrated HBr. This was confirmed in a series of experiments in which, after the extraction, the DIBC along with all extracted species was stripped from the columns with acetone. It is concluded that, in the present chemical system, the extraction behaviour of element 105 is closer to that of niobium than to that of protactinium. The decreasing extractability from HBr (Pa > Nb > Ha) is likely to be due to an increasing tendency of these Clements to form non-extractable polynegative complex species in concentrated HBr in the sequence Pa < Nb < Ha.

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Vergleichende Untersuchung der Lösungsmittelextraktion von Protactinium, Tantal, Niob und Zirkon aus starker Salzsäure

Und

Herrmann

1960

Zeitschrift für Elektrochemie, Berichte der Bunsengesellschaft

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Die Extraktion der Elemente Protactinium, Tantal, Niob und Zirkon aus starker Salzsäure wurde mit folgenden Extraktionsmitteln untersucht: unverdünntes Tri‐n‐butylphosphat, 0,01 m Tri‐n‐octyl‐phosphinoxyd in Benzol und unverdünntes Di‐iso‐butylcarbinol. Neben reiner Salzsäure wurden Mischungen mit starken Komplexbildnern ‐ Flußsäure, Oxalsäure und Weinsäure ‐, in einigen Fällen auch reine Perchlorsäure als wäßrige Phasen verwendet. Aus den erhaltenen Daten ergibt sich ein einfaches Verfahren zur Reingewinnung von Protactinium aus Konzentraten: Tantal und Niob werden aus 6n HCl ‐ 1‐3n HF mit Di‐iso‐butylcarbinol extrahiert, anschließend wird die wäßrige Phase mit AlCl3 gesättigt und das Protactinium mit demselben Extraktionsmittel extrahiert. Zirkon bleibt in der wäßrigen Phase. Das chemische Verhalten der vier Elemente in den genannten wäßrigen Phasen wird qualitativ verglichen. Dabei zeigt Protactinium eine größere Ähnlichkeit zum Zirkon als zu seinen homologen Elementen Tantal und Niob.

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The chemistry of protactinium—V A comparison of the extraction of protactinium, niobium and tantalum

Cited by 37 publications

References 20 publications

Solvent Extraction of Zr(IV) and Nb(V) with 1-Phenyl-3-methyl-4-benzoyl-pyrazole-5-one and Tri-iso-octylamine from Different Mineral Acid Solutions.

Solvent Extraction of Zr(IV) and Nb(V) with 1-Phenyl-3-methyl-4-benzoyl-pyrazole-5-one and Tri-iso-octylamine from Different Mineral Acid Solutions.

Chemical Properties of Element 105 in Aqueous Solution: Extractions into Diisobutylcarbinol

Vergleichende Untersuchung der Lösungsmittelextraktion von Protactinium, Tantal, Niob und Zirkon aus starker Salzsäure

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