A New Solvent Extraction Method for the Separation of Niobium and Tantalum

Leddicotte, G. W.; Moore, F. L.

doi:10.1021/ja01126a529

Cited by 71 publications

(17 citation statements)

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“…Acid uptake by these amine solu tions is formally very similar to that of weakly basic anion exchangers [Smith & Page (39)]. Further, extraction of metals by these amines is re markably similar to adsorbabilities by anion exchange resins as becomes im mediately apparent from a comparison of typical anion exchange (14) and extraction data (40,41,42). Hence knowledge gained from anion exchange studies appears directly transferable to amine salt extractions, and con versely their study should help elucidate the properties of anion exchangers.…”

Section: Methodsmentioning

confidence: 88%

Radiochemical Separations by Ion Exchange

Ka¹,

Nelson²

1957

Annu. Rev. Nucl. Sci.

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During the past few years ion exchange has become firmly entrenched as a separations tool. Its great popularity stems from its theoretical and practical simplicity, its insensitivity to concentration, its versatility and broad applicability, its rapidity for obtaining materials of extremely high purity and, of course, from the ready availability of reasonably stable ion exchange materials. Ion exchange is ideally suited for separations at the trace concentration so typical for radiochemical work and, indeed, ion exchange and radiochemical developments have been closely allied. Further, because ion exchange columns are simple to operate, easily shielded and adaptable to remote control, their use is attractive, even at relatively high activity levels.The war-time work on the Manhattan project on the separation of rare earth and other fission products is generally considered the starting point of the present great interest in the use of ion exchangers for inorganic and radio chemical separations. Since then, application of ion exchangers to radio chemical problems has increased enormously and now includes such widely different fields as analysis, process control, isolation of tracers from target materials, discovery, identification and study of new elements, separation of activities in neutron activation analysis, general investigations of the chemistry of solutions, "hot atom" chemistry, production of radioisotopes, and waste disposal. The isolation of uranium from low grade ores is, in principle, also a radiochemical separation and has become the largest appli cation of ion exchangers outside the water conditioning field.The flood of ion exchange papers originating in many laboratories throughout the world is now so large as to preclude adequate coverage in the limited space of this review, even if attention is confined, as will be done here, to inorganic separations. Complete restriction of the paper to radio chemical applications, although implied by the title, seemed inappropriate since except at highest radiation densities, there is essentially no difference between separations of active or inactive materials. The field to be covered is thus extremely large and, in order to stay within bounds, citation of references had to be severely restricted, and selections often be made on an arbitrary basis. Fortunately, the field is frequently reviewed and a number of recent books (e.g., refs. 1 to 9) and review articles (e.g., refs. 10 to 21) are available. In addition, it is hoped that sufficient individual citations have been made to provide an adequate introduction to recent developments in the field.

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Section: Methodsmentioning

confidence: 88%

Radiochemical Separations by Ion Exchange

Ka¹,

Nelson²

1957

Annu. Rev. Nucl. Sci.

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“…Research has been done to study the feasibility of using amines for the extraction of metal ions. Leddicotte and Moore (1952) were the first to record the use of amines in solvent extraction of metallic elements from solution. It was found that niobium could successfully be extracted from strong hydrochloric acid with a solution of methyldioctylamine (a tertiary amine) in xylene (Leddicotte and Moore 1952).…”

Section: Extraction Of Metal Ions Using Aminesmentioning

confidence: 99%

“…Leddicotte and Moore (1952) were the first to record the use of amines in solvent extraction of metallic elements from solution. It was found that niobium could successfully be extracted from strong hydrochloric acid with a solution of methyldioctylamine (a tertiary amine) in xylene (Leddicotte and Moore 1952). Crouse and Denis (1955) showed the success of using amines to extract thorium, uranium, and rare earths from sulfuric acid digests of monazite sands, and Lucas and Ritcey (1971) proved it possible to extract thorium and uranium from leach liquor that resulted from sulfuric acid leaching of uranium ore. Coleman (1963) also discussed the use of primary, secondary, tertiary, and quaternary ammoniums for extracting metal ions from sulfate, chloride, and nitrate systems.…”

Section: Extraction Of Metal Ions Using Aminesmentioning

confidence: 99%

Recovery of yttrium and neodymium from copper pregnant leach solutions by solvent extraction

Copp

2018

Hydrometallurgy

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“…Recently.9 separations have been achieved by liquid-liquid extraction methods. Leddicotte and Moore (34) found liter was used in these experiments. Single stage extractions of this solution or its water dilutions with many organic solvents indicated that some solvents extracted more than 50 per cent of the total tantalum,ana lyzing less than one per cent niobium.…”

Section: Separation Of Niobium and Tantalummentioning

confidence: 99%

Separation of Niobium and Tantalum a Literature Survey

Koerner¹,

Smutz²

1956

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During recent years increased interest has been shown in the metal niobium. Because niobium has a high melting point (4376° F) and a low neutron cross-section, the Atomic Energy Commission has encouraged research on new methods of winning the metal from its ores with the ultimate hope of finding a process which would yield niobium metal at a reasonable price. The two areas of endeavor in which•the principal difficulties in finding such an economic process occur are the separation of tantalum from the niobium and the conversion of purified niobium salts to the metal. This report, then, was written to consolidate the more important information available in the literature on one of these troublesome areas, that of the separation of niobium and tantalum. It is to be noted, however, that all the references available in the literature on niobiumtantalum separation are not included in this report, but only those which appear to have the most usefulness for future endeavors on this problem.

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A New Solvent Extraction Method for the Separation of Niobium and Tantalum

Cited by 71 publications

References 0 publications

Radiochemical Separations by Ion Exchange

Radiochemical Separations by Ion Exchange

Recovery of yttrium and neodymium from copper pregnant leach solutions by solvent extraction

Separation of Niobium and Tantalum a Literature Survey

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