(PDF) Sorption of tungsten (VI) and rhenium (VII) on various …

[Show full abstract] experimental conditions, alumina is a much better adsorbent for tungsten than for rhenium. The obtained results indicated that the best separation of these two elements is ...

Radiochemical separation of rhenium(VII) from …

tungsten(VI) using any of the acid or salt solutions investigated. The experimental data allowed to develop a simple procedure for the radiochemical separation of rhenium isotopes from an irradiated WOz sample. Introduction Irradiation of natural tungsten with thermal or epithermal neutrons gives

Chromatographic separation of rhenium radioisotopes from …

Separation technique of rhenium radioisotopes from a deuteron-irradiated tungsten target of natural isotopic composition has been developed. The irradiated tungsten powder was dissolved in a mixture of H2O2 and NaOH, the solution was passed through a column filled with an … See more

Sustainable Extraction and Complete Separation of Tungsten from

Complete separation of tungsten from molybdenum has long been a technical bottleneck in the metallurgy of molybdenum because no theoretical basis exists for the complexation and extraction mechanism of tungsten and molybdenum from aqueous solution. To completely separate tungsten from ammonium molybdate, the speciation and equilibria …

SEPARATION OF TANTALUM, TUNGSTEN, AND RHENIUM …

Journal Article: SEPARATION OF TANTALUM, TUNGSTEN, AND RHENIUM BY COPRECIPITATION WITH IRON HYDROXIDE. SEPARATION OF TANTALUM, TUNGSTEN, AND RHENIUM BY COPRECIPITATION WITH IRON HYDROXIDE. (in Russian) Full Record; Other Related Research; Authors: Novikov, A I; Ryazanova, G K

Effects of tungsten and rhenium additions on phase-separation …

Effects of tungsten and rhenium additions on phase-separation in a model Ni-Al-Cr-W-Re superalloy: A four-dimensional study

Effects of tungsten and rhenium additions on phase-separation …

@article{Huang2019EffectsOT, title={Effects of tungsten and rhenium additions on phase-separation in a model Ni-Al-Cr-W-Re superalloy: A four-dimensional study}, author={Yanyan Huang and Zugang Mao and Ronald D. Noebe and David N. Seidman}, journal={Journal of Alloys and Compounds}, year={2019} } Yanyan Huang, Z. Mao, +1 …

Separation of tungsten and rhenium on alumina in …

The separation of tungstate and perrhenate anions on alumina from aqueous solutions of sodium chloride was investigated in dynamic conditions. The breakthrough curves for W and Re as the function of the ratio of their concentrations in the solution, were determined. The flow rate (3 ml/min), pH 2 and NaCl concentration (0.15 mol/l) were kept …

Microstructure and Properties of Tungsten Rhenium …

Abstract. Tungsten alloy with addition of rhenium and tantalum was prepared by laser sintering. Microstructure and properties of the samples were tested by optical microscope, X-ray difractometer ...

Anion-exchange separation of molybdenum and technetium and of Tungsten

DOI: 10.1016/0022-1902(56)80113-9 Corpus ID: 95452222; Anion-exchange separation of molybdenum and technetium and of Tungsten and rhenium @article{Huffman1956AnionexchangeSO, title={Anion-exchange separation of molybdenum and technetium and of Tungsten and rhenium}, author={Eugene H. …

SORPTION OF TUNGSTEN(VI) AND RHENIUM(VII) ON …

Separation Science and Technology Volume 36, 2001 - Issue 2. Submit an article Journal homepage. 109 Views 11 CrossRef citations to date 0. Altmetric Original Articles. SORPTION OF TUNGSTEN(VI) AND RHENIUM(VII) ON VARIOUS ION-EXCHANGE MATERIALS. M. Khalid Nuclear Chemistry Division, Pakistan Institute of …

Segregation and aggregation of rhenium in tungsten grain …

Semantic Scholar extracted view of "Segregation and aggregation of rhenium in tungsten grain boundary: Energetics, configurations and strengthening effects" by Bo Zhang et al. ... Ab initio calculation of traction separation laws for a grain boundary in molybdenum with segregated C impurites. A. M. Tahir R. Janisch A. Hartmaier.

Effect of Rhenium addition on tungsten heavy alloys …

Abstract. In this study, Rhenium is added to traditional (W-Ni-Fe) Tungsten heavy alloys keeping the ratio of Ni:Fe as 7:3 constant and varying the proportions of W …

Separation of rhenium from molybdenum, tungsten, …

DOI: 10.1016/0039-9140(70)80163-1 Corpus ID: 35002491; Separation of rhenium from molybdenum, tungsten, vanadium, platinum metals and other elements by reduction and solvent extraction.

Radiochemical separation of rhenium(VII) from tungsten(VI)

The absorption of rhenium(VII) and tungsten(VI) ions on Al 2 O 3 from HCl, HClO 4, HNO 3, H 2 SO 4, H 3 PO 4, NaOH, NH 4 OH, NaCl, NaF, and Na-tartarate solutions by batch equilibration, as well as by passage through a chromatographic column, has been studied. The results show that rhenium(VII) can be effectively separated from tungsten(VI) using …

Separation of rhenium from molybdenum, tungsten, …

Accepted 26 January 1970) THE SEPARATION of rhenium from molybdenum is often required' for its determination in molybdenites, concentrates and flue dusts, and the increasing use of rhenium as a minor constituent in alloys' of potential importance in rocketry, defence and atomic energy calls for rapid and simple methods for its …

ANION EXCHANGE SEPARATION OF RHENIUM AND TUNGSTEN …

Journal ArticlePirs, M; Magee, R - Talanta (England) An anion-exchange method for the separation of Tc, Re, and Mn is outlined. After sorption on the resin column, Mn is first eluted with HCl, Re with ammonium thiocyanate in HCl, and Tc with HNO/sub 3/. In the eluates Re is determined colorimetrically and Tc radiochemically.

ANION EXCHANGE SEPARATION OF MOLYBDENUM AND TECHNETIUM AND OF TUNGSTEN

Huffman, E H, Oswalt, R L, and Williams, L A. ANION EXCHANGE SEPARATION OF MOLYBDENUM AND TECHNETIUM AND OF TUNGSTEN AND RHENIUM.United States: N. p., 1956. Web.

Separation of molybdenum (VI), rhenium (VII), tungsten …

Rhenium, molydenum, vanadium, and tungsten have wide applications in various fields (Nguyen and Lee, 2016a, Nguyen and Lee, 2015a). Owing to the high commercial value of rhenium and increasing demand for molybdenum, vanadium, and tungsten, the separation and recovery of these four metals from diverse resources …

Tungsten and Rhenium Sorption Study on Alumina to Prepare

Abstract. Rhenium-188 is a radionuclide with favorable physical characteristics suitable for radiotherapeutic purposes (T 1/2 16.9 h, E βmax 2.12 MeV; E γ 155 keV (15%)) for …

Effects of tungsten and rhenium additions on …

Transient diffusional concentration gradients associated Tungsten with solute-atoms during diffusion-limited growth exist in either the g(f.c.c.)-matrix or g0 (L12)-pre- Rhenium cipitates for the as-quenched state; …

Review of rhenium extraction and recycling technologies …

A flowsheet of rhenium separation from rhenium-bearing solutions by solvent extraction method. Table 2. ... (2015) used a similar roasting method to Heshmatpour and MaDonald (1982) to recovery of rhenium form tungsten-rhenium wire scrap at 900 °C in the presence of air. Then the volatilized Re 2 O 7 solid was recovered …

Effect of concentration of rhenium and temperature on …

Using the EAM potential, we conducted a molecular dynamics (MD) simulation using the LAMMPS software [19] to investigate the structural behavior of …

US4599223A

A process is disclosed for separating tungsten from a solution containing tungstate and perrhenate ions. The process involves reacting a sufficient amount of hydrochloric acid with the solution at a sufficient temperature to form a solid containing essentially all of the tungsten and a liquor containing essentially all of the rhenium, and separating the solid …

Strengthening of tungsten by coherent rhenium …

Experimental data show that the accumulation of rhenium and osmium from transmutation reactions severely afect the microstructural evolution and property degradation of tungsten-based materials under neutron irradiation. Theory and mod-eling have confirmed that Re atom transport in W is by irradiation-produced migrating self-interstitial atoms.

Separation of tungsten and rhenium on alumina in dynamic conditions

separation of tungsten and rhenium is achieved also in . dynamic conditions. To get the real insight into the competitive sorption . of tungstate and perr henate anions on alumina, it is .

Separation of rhenium from molybdenum, tungsten, …

Acla, 47 (1969) 563-568 Separation of rhenium from molybdenum, tungsten, vanadium and some other elements by extraction with isoamyl alcohol from phosphoric acid-hydrogen peroxide Rhenium(VII) can be extracted from hydrofluoric acid media with etlleri and quaternary amines, from hydrochloric and sulphuric acids with various oxygenated …

Effects of tungsten and rhenium additions on phase-separation …

The effects of a combined 1.0 at.% W and 1.0 at.% Re addition to a model Ni-10.0Al-8.5Cr at.% superalloy aged at 1073 K (800 °C) for aging times up to 256 h are investigated using atom-probe tomography (APT) and Vickers microhardness measurements. The nanoscale properties, including volume fraction, mean-volume …

The tungsten-188/rhenium-188 generator: Effective coordination of

Rhenium-188 (188Re) is a high energy beta-emitting radioisotope with a short 16.9 h physical half-life, which has been shown to be a very attractive candidate for use in therapeutic nuclear medicine.

(PDF) Chromatographic separation of rhenium …

The separation procedure takes approximately 3 h, the radiochemical yield of rhenium is more than 97%. Elution profile of tungsten, tantalum and rhenium Figures - uploaded by Ekaterina Furkina

SEPARATION OF RHENIUM FROM VANADIUM AND …

Rhenium may be separated from V by passing a 0.3N HCl solution containing both ions through a column packed with MMG-1 anion exchange resin (OH form). Washing with …

Anion-exchange separation of molybdenum and technetium and of Tungsten

Abstract. The present work was designed to meet a need in radiochemistry for the ready separation of molybdenum and technetium and of tungsten and rhenium. The distribution coefficients for these elements on an anion-exchange resin have been determined in hydrochloric- and nitric-acid solutions of varying concentration.

Separation of molybdenum(VI), rhenium(VII), tungsten(VI), …

DOI: 10.1016/J.HYDROMET.2017.06.006 Corpus ID: 98968821; Separation of molybdenum(VI), rhenium(VII), tungsten(VI), and vanadium(V) by solvent extraction @article{Truong2017SeparationOM, title={Separation of molybdenum(VI), rhenium(VII), tungsten(VI), and vanadium(V) by solvent extraction}, author={Hoai Thanh Truong and …

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Separation of molybdenum (VI), rhenium (VII), tungsten (VI), …

The separation of Mo(VI), V(V), Re(VII), and W(VI) by solvent extraction was investigated. Since tungsten acid precipitates at low pH, the target solutions were …

Carrier-free chemical separation of rhenium from tantalum or tungsten …

Comerford, John R., and Kurbatov, M. H. Carrier-free chemical separation of rhenium from tantalum or tungsten targets.United States: N. p., 1963. Web. doi:10.2172 ...

Theoretical Prediction of Rhenium Separation from …

Rhenium (Re) is an extremely rare and precious element that is mainly used in the construction of aerospace components and satellite stations. However, an efficient and simple method for preparing Re has yet to be devised. To this end, we investigated the vibrational spectrum of ammonium perrhenate (NH4ReO4) using the CASTEP code …

Separation of tungsten from rhenium (Patent) | OSTI.GOV

Patent: Separation of tungsten from rhenium Separation of tungsten from rhenium. Full Record; Other Related Research Related Research

Ion Exchange Separation of Rhenium from Molybdenum

Separation and Determination of Rhenium by Anion Exchange Using the Fluoride-Chloride System.. Analytical Chemistry 1965, 37 (2), ... Anion-exchange separation of molybdenum and technetium and of Tungsten and rhenium. …