Our separation hafnium phase

Separation of hafnium from zirconium using tributyl …


Separation of hafnium from zirconium using tributyl phosphate Abstract The separation of hafnium from zirconium using tributyl phosphate offers interesting alternatives to present methods for making reactor-grade zirconium. Feed solution for the extraction step can be prepared from the reaction product of caustic and zircon sand.

Method for separating hafnium from zirconium - ATI ...


May 18, 2004· A method is provided to optimize separation of zirconium from hafnium by extraction of a feed mix including (Zr+Hf)OCl 2 with a thiocyanate-containing organic phase. The method includes maintaining the TA/MO 2 ratio in a range from greater than about 2.55 to about 3.5.

Zirconium and Hafnium Separation, Part 1. Liquid Liquid ...


Zirconium and Hafnium Separation, Part 1. Liquid/Liquid Extraction in Hydrochloric Acid Aqueous Solution with Aliquat 336 L. Poriel Laboratoire de Catalyse et …

Separation of hafnium from tungsten by ... - DeepDyve


Read "Separation of hafnium from tungsten by extraction chromatography with TOA in HCl–H 2 O 2 mixture, Journal of Radioanalytical and Nuclear Chemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Separation of hafnium from tungsten by extraction ...


Abstract. In order to measure 182 Hf by accelerator mass spectrometry (AMS), a chemical procedure for separation of hafnium from tungsten has been developed by extraction chromatography. The extraction chromatographic behavior of hafnium and tungsten has been studied using tri-n-octylamine (TOA) as the stationary phase, HCl–H 2 O 2 mixture and NH 3 ·H 2 O as the mobile phase.

Solvent extraction of hafnium from thiocyanic acid medium ...


Solvent extraction of hafnium from thiocyanic acid medium in DIBK−TBP mixed system XU Zhi-gao1,2, ... concentrations of zirconium and hafnium in water phase ... metal concentrations are conducive to the separation of hafnium from zirconium.

Study of Zirconium and Hafnium Separation by Solvent ...


Therefore the separation of these elements is of utmost importance for the use of zirconium tubes containing nuclear fuel. However, due to the great chemical similarity between Zr and Hf their separation is difficult [2] [5] [6]. Thus, the separation of zirconium and hafnium require elaborate processes.

Phase separation of a hafnium alkoxide-modified ...


This paper describes a systematic study on the polymer-to-ceramic transformation and phase separation of a hafnium alkoxide-modified polysilazane upon pyrolysis. Correlated TGA/MS, MAS NMR and TEM investigations revealed that the hafnium-containing polysilazane transforms at 700 °C into an

A new process for the separation of hafnium from zirconium


A new process for the separation of hafnium from zirconium has been developed. This process is based on the repeated reaction of themixedtetrachloride vapors of zirconium and hafnium with alkali metalchloride salts in a solid form; hafnium tends to remain in the condensed phasewhile zirconium concentrates in the vapor phase. This process has been

Separation of zirconium and hafnium by solvent extraction ...


Separation of zirconium and hafnium by solvent extraction using mixture of TBP and Cyanex 923. Author links open overlay panel M. Taghizadeh M. Ghanadi E. Zolfonoun. ... concentration of nitrate anion and nitrate anion/sodium nitrate ratio in the aqueous phase on the separation factor of Zr/Hf.

Hafnium - Wikipedia


Hafnium and zirconium tend to occur together in nature and the similarity of their ionic radii makes their chemical separation rather difficult. Hafnium tends to form inorganic compounds in the oxidation state of +4. Halogens react with it to form hafnium tetrahalides.

Separation of zirconium and hafnium by solvent extraction ...


Separation of zirconium and hafnium by solvent extraction using mixture of DIBK ... 2004) have been evaluated for extraction separation of zirconium and hafnium from aqueous solutions. Acid extraction agents and chelating ... phase was taken for analysis after phase separation…

Selective Extraction of Zirconium (IV) from Hafnium (IV ...


After equilibration and phase separation, a suitable volume of the aqueous phase was spectrophotometrically measured. The concentration of the metals in the organic phase was calculated from the difference between its concentration in the aqueous phase before and after extraction. The

US5009751A - Process for separation of hafnium ...


Running first phase electrolysis which produces zirconium trichloride containing a lower hafnium content than the dissolved zirconium tetrachloride at the cathode. Running second phase electrolysis using the first cathode, but switching the first cathode to become an anode and using a second cathode.

Zirconium - Wikipedia


Separation of zirconium and hafnium ... Immuno-PET has reached a maturity of technical development and is now entering the phase of wide-scale clinical applications. Until recently, radiolabeling with 89 Zr was a complicated procedure requiring multiple steps. In ...

Solid-Vapor Equilibria of Hafnium and Zirconium Tetrachlorides


in the solid phase and its vapor pressure as a pure solid at the temperature considered. SOLID -VAPOR EQUILIBRIA OF HAFNIUM AND ZIRCONIUM TETRACHLORIDES by ... (19) claimed separation of hafnium and zirconium tetrachlorides by distillation from fused stannous chloride, but temperatures up to 450 °C and severe corrosion were also noted.

A highly selective liquid-liquid extraction technique for ...


for the extraction and separation of hafnium (IV) with hexaacetato calix(6)arene ... relatively less toxicity; it gave better phase separation and greater accuracy in results. It was observed that solvents having low dielectric constants show extraction of Hf(IV) above 90%.

v116n10a4 The separation of zirconium and hafnium from …


The separation of zirconium and hafnium from (NH 4) 3 Zr(Hf)F ... in the aqueous phase was determined using ICP-OES before and after extractions. When using sulphuric acid solutions, extractions of >80% were reached both for Zr and Hf. In all cases equilibrium was achieved in less

Reversed-Phase Chromatographic Separation of Zirconium and ...


Reversed-Phase Chromatographic Separation of Zirconium and Hafnium. ... Reversed-Phase Chromatographic Separation of Zirconium and Hafnium. J. S. Fritz and R. T. Frazee. Anal. Chem., 1965, 37 ... Synthesis of N-Benzoyl Phenyl Hydroxyl Amine Derivative of Styrene Divinyl Benzene Copolymer and Its Application in Separation of Zirconium from Hafnium.

Study of Zirconium and Hafnium Separation by Solvent ...


Aqueous phase: 15.0 g∙L−1 of Zr, 0.6 g∙L−1 of Hf, 1.0 to 5.0 mol∙L−1 of H+, ... Study of Zirconium and Hafnium Separation by Solvent Extraction Technique from Nitric and Hydrochloric Solutions with Acid, Basic and Neutral Extractants ...

Grazing-incidence small angle x-ray scattering studies of ...


Grazing-incidence small-angle x-ray scattering (GISAXS) and high-resolution transmission electron microscopy (HRTEM) were used to investigate phase separation in hafnium silicate films after rapid thermal annealing between 700 and 1000 °C. 4-nm-thick Hf–silicate films with 80 and 40 mol % HfO2, respectively, were prepared by metalorganic vapor deposition.

Extraction and separation of zirconium from hafnium using ...


Abstract. A simple method based on the dispersive liquid–liquid microextraction and a solidification of floating organic drop followed by an inductively coupled plasma-optical emission spectrometry (ICP-OES) was developed for the extraction and separation of zirconium from hafnium.

(PDF) Separation of Zirconium and Hafnium: A Review


separation, which starts from crude ore to hafnium-free zirconium metal product, shows a great potential for industrial application. However, it is still under investigation on laborat ory scale [5] .

Zirconium and hafnium separation from chloride solutions ...


Zirconium and hafnium separation from chloride solutions by organophosphorous compounds by A. B. Vianna da Silva Jr. Department ofMiningand Metallurgical Engineering McGill University Montreal, Quebec, Canada September, 1996 Thesis submitted to theFaculty ofGraduate Studies and Research in partial fulfillment ofthe requirements for the degree ...

Managing Zirconium Chemistry and Phase Compatibility in ...


Phase Compatibility in Combined Process Separations for Minor Actinide Partitioning Fuel Cycle Research and Development ... DE-NE0000674 – Final report 1 of 49 Managing Zirconium Chemistry and Phase Compatibility in Combined Process Separations for Minor Actinide Washington State University ... Hafnium(IV) complexation with oxalate at ...

Matrix Studies on Solvent Extraction of Zirconium and ...


Solvent extraction technology is separation process for solutes difficult to separate. The extraction of zirconium require separation of hafnium present in GPL (grams per litre). It involves separation of liquid constituents by contact with another insoluble liquid i.e separation of two …

US4231994A - Separation of zirconium from hafnium by ...


Separation of zirconium and hafnium by solvent extraction with a tertiary amine from sulfuric acid solution is improved by addition of water-soluble α-hydroxycarboxylic acid to the aqueous phase.

Separation of zirconium from hafnium by solvent extraction ...


Nov 04, 1980· The separation factor, α, refers to the tendency of zirconium to extract into the organic phase relative to the tendency of hafnium to extract into the organic phase during solvent extraction. It is defined by the equation: α=[Zr] org [Hf] aq /[Zr] aq [Hf] org

SEPARATING HAFNIUM FROM ZIRCONIUM - osti.gov


The separation of hafnium impurities from zirconium can be accomplished by means of organic solvent extraction. The hafnium-containing zirconium feed material is dissolved in an aqueous chloride solution and the resulting solution is contacted with an organic hexone phase, with at least one of the phases containing thiocyanate.

SEPARATION OF HAFNIUM FROM ZIRCONIUM - osti.gov


The separation of hafnium impurities from zirconium can be accomplished by means of organic solvent extraction. The hafnium-containing zirconium feed material is dissolved in an aqueous chloride solution and the resulting solution is contacted with an organic hexone phase, with at least one of the phases containing thiocyanate.

Application of liquid-liquid extraction for the separation ...


Application of liquid-liquid extraction for the separation of zirconium from hafnium R. A. Foos ... The use of liquid-liquid extraction for the separation of zirconium from hafnium was demonstrated. Hafnium ... the aqueous phase to the organic phase and separation …

Separation of Hafnium from Zirconium by Extraction ...


Separation of Hafnium from Zirconium by Extraction Chromatography with Liquid Anionic Exchangers X.J. Yang. 1. ... as the stationary phase supported on a styrene/divinylbenzene copolymer resin and hydrochloric acid as the mobile phase. The effects of hydrochloric acid concentration, extractant loading on the support, support particle size ...

Zirconium and hafnium separation with molten salt ...


Zirconium and hafnium separation with molten salt extraction in Sn–Cu–Zr–Hf and Cu–Zr–Hf alloy systems L. Xu Department of Materials Science and Engineering, Delft University of Technology, Delft, The Netherlands; School of Materials Science and Metallurgy, Northeastern University, Shenyang, China


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