Nuclear grade zirconium and hafnium are important materials in nuclear power plants, which are usually produced with solvent extraction and separation …

The separation of hafnium from commonly associated elements such as scandium, yttrium, uranium, thorium, alkali and alkaline earth metals in 500:1 weight ratio to hafnium is also possible.

Ion exchange separation, though less commonly utilized, involves separating zirconium and hafnium through ion exchange. It has seen limited application, primarily in smaller production volumes. For instance, it was employed in the former Soviet Union to further separate hafnium from hafnium-rich material obtained through the zirconium-hafnium ...

Hafnium is a chemical element with the symbol Hf and atomic number 72. It is a lustrous, silvery-gray metal that is commonly found in zirconium minerals. ... They are known for their unique magnetic, optical, and catalytic properties. ... This involves crushing, grinding, and gravity separation techniques to separate the heavy minerals from the ...

Hafnium is a good absorber of neutrons and is used to make control rods, such as those found in nuclear submarines. It also has a very high melting point and because of this is used in plasma welding torches. Hafnium has been successfully alloyed with several metals including iron, titanium and niobium.

Abstract Sorption behavior of zirconium and hafnium on different commercial anion exchange resins with different amine functions; ammonium (Amberjet 4200Cl), pyridine (PVP) and pyridinium (HPQ) was investigated in hydrochloric acid by both batch and column methods. Experiments were studied as a function of the concentration of …

A liquid–liquid extractive separation between hafnium and zirconium from thiocyanic acid medium using the mixtures of diisobutyl ketone (DIBK) and di (2-ethylhexyl) phosphoric acid (P204) as the extractant was developed. Under this condition of that the aqueous acidity is 1.0 mol/L, the concentration of P204 in the organic phase is 10% (v/v), …

Extraction and Separation of Zirconium (IV) and Hafnium (IV) from Chloride Media Using Magnetic Resin with Phosphoric Acid Functionality. February 2011. Journal …

New Magnetic nanocomposites containing biological polymer (i.e. chitosan and cellulose) as reinforcers were synthesized. Successful fabrication of the magnetic cellulose-chitosan (MCCh) nanocomposites with norvaline (MCCh-N) and 8-hydroxyquinoline (MCCh-8H), respectively were achieved and investigated as a …

The zirconium and hafnium solutions were pre pared by dissolving the "reactor grade" metals, usually about 50 mg, in sulfuric-hydrofluoric acid solutions. The zirconium was nearly hafnium-free, but the hafnium contained several percent of zirconium. The solution was evaporated several times to fumes of sulfuric acid, and the walls of the ...

Lawrence A. Machlan and John L. Hague. (August 2, 1962) A procedure is described for the separation of hafnium from zirconium and their indi-vidual determination. The sample is …

Abstract. Hafnium (Hf) is an important strategic material for the semiconductor, aerospace and nuclear industries. In this paper, an advanced ion …

DOI: 10.1016/J.HYDROMET.2021.105600 Corpus ID: 233576120; Separation of hafnium from zirconium in HNO3 solution by solvent extraction with Cyanex572 @article{Hongyang2021SeparationOH, title={Separation of hafnium from zirconium in HNO3 solution by solvent extraction with Cyanex572}, author={He Hongyang and Xu Fei …

The highest hafnium/zirconium separation factor (βHf/Zr) in the current study occurs with (2-ethylhexyl) (2,4,4-trimethylpentyl)phosphinic acid (USTB-1), which reaches 19.2. View Show abstract

Separation and Purification Technology. Available online 3 April 2024, 127276. In Press, Journal Pre-proof. What's this? P507-modified Magnetic Porous Carbon Derived from Metal-Organic Frameworks for Efficient Separation of Zirconium (IV) and …

Abstract. Extraction and separation of hafnium (Hf) from zirconium (Zr) in HNO 3 solution were carried out with Cyanex572 as extractant. Hf could be selectively extracted with an optimized extraction rate of 76.8%, and the separation factor between Hf and Zr could reach up to 15.7 when the concentration of Zr(IV), Hf(IV), H +, NO 3-and (NH 4) 2 SO 4 …

The contaminants attached to the magnetic nanoparticles are subsequently removed using a small volume of stripping agent. In this study, tributylphosphate (TBP) modified magnetic nanoparticles with particle size of 10 nm were evaluated for the extraction and separation of hafnium from zirconium. Laboratory scale investigations …

The polymer-to-ceramic transformation of a hafnium alkoxide-modified polysilazane was investigated via thermogravimetric analysis coupled with in situ mass spectrometry (TG/MS), nuclear magnetic resonance (MAS NMR) and transmission electron microscopy (TEM). The results indicate that the structural evolution of the polysilazane …

Semantic Scholar extracted view of "Highly efficient separation and enrichment of hafnium from zirconium oxychloride solutions by advanced ion-imprinted membrane separation technology" by T. Tang et al. ... P507-modified Magnetic Porous Carbon Derived from Metal-Organic Frameworks for Efficient Separation of Zirconium(IV) and Hafnium(IV)

DOI: 10.1016/S1385-8947(01)00256-X Corpus ID: 95886574; Separation of zirconium and hafnium using hollow fibers: Part I. Supported liquid membranes @article{Yang2002SeparationOZ, title={Separation of zirconium and hafnium using hollow fibers: Part I. Supported liquid membranes}, author={Xiang-Zhong Yang and Anthony …

A. van Sandwijk. Zr-Hf-Ti Metallurgie B.V.; Van der Heimstraat 62, Den Haag, SB, The Netherlands. Search for more papers by this author

hafnium (Hf), chemical element ( atomic number 72), metal of Group 4 (IVb) of the periodic table. It is a ductile metal with a brilliant silvery lustre. The Dutch physicist Dirk Coster and the Hungarian Swedish chemist George Charles von Hevesy discovered (1923) hafnium in Norwegian and Greenland zircons by analyzing their X-ray spectra.

Corpus ID: 256783843. Highly efficient separation and enrichment of hafnium from zirconium oxychloride solutions by advanced ion-imprinted membrane separation …

Zirconium is an ideal material for nuclear reactors due to its low absorption cross-section for thermal neutrons, whereas the typically contained hafnium with strong neutron-absorption is very harmful for zirconium. This paper provides an overview of the processes for separating hafnium from zirconium. The separation processes are roughly ...

The hafnium-to-zirconium separation factor is approximately constant (≈8) over the 0.5–3 N range. Under certain conditions, an unseparated fraction was observed that was not retained by the resin.

Properties and Applications of some Zirconium and Hafnium Compounds. Decomposition of Zirconium Ores. Preparation of Zirconium Compounds and Intermediates. Separation of Zirconium and Hafnium: Commercial Processes. Alternative Separation Processes. Reduction to the Metals. Alternative Reduction Processes. Purification of the …

A solvent extraction method has been employed to extract and separate zirconium and hafnium from the nitric acid medium using Cyanex-272 and its mixture with TBP in kerosene. The effects of the experimental parameters such as contact time between phases, aging time, nitric acid concentration, Cyanex-272 and TBP concentration on the …

The preparation of nuclear-grade zirconium and hafnium is very important for nuclear power. The separation of hafnium from zirconium in a hydrochloric acid solution by solvent extraction was investigated with di(2-ethylhexyl)phosphoric acid (D2EHPA). The effects of hydrochloric acid concentration, extractant concentration, …

Under the optimal operating conditions of 10 % HCl, 1.5 M KF, 15 minutes and an organic-to-aqueous phase ratio of 2:1, the extraction percentage of zirconium and hafnium is 94.3 % of Zr and 64.3 % of Hf and a separation factor of 9.2 for 2-octanol and 93.1 of Zr and 60.9 % of Hf and a separation factor of 8.7 %. 2-octanol shows a slightly ...

The extraction chromatographic behavior of zirconium(IV) and hafnium(IV) was investigated using di(1-methylheptyl) methylphosphonate (DMHP) as a stationary phase in the media of hydrochloric acid-ammonium chloride by a batch method. Through a log-log analysis and the IR spectra the extractable species has been proposed to be …