hafnium magnetic separation

Separation of zirconium and hafnium from nitric acid solutions with LIX 63, PC 88A and their mixture by solvent extraction. Hydrometallurgy (2014) ... This paper proposes a new integrated method for recycling permanent magnet waste by betaine hydrochloride ([Hbet]Cl) solution extraction. The orthogonal experiment method was …

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 …

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 …

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.

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 …

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, …

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)

Magnetic Separation. Heavy minerals in the magnetic minerals are ilmenite, hematite, chromite, garnet, biotite, monazite, and so on. Zircon is a non-magnetic mineral or a weakly magnetic mineral. Magnetic separation is divided into two types: dry type and wet type. The dry magnetic separation must be preheated before drying and …

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.

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

In general, the production route of pure zirconium and hafnium from zircon ore is achieved through five stages [13]: (1) decomposition of the ore; (2) separation of hafnium; (3) calcination; (4) chlorination; and (5) reduction by Kroll process [14], [15]. Fig. 1 shows the flowsheet for the manufacture of pure zirconium and hafnium. Decomposition …

In the present study, a simple versatile extraction method based on supramolecular solvent microextraction followed by inductively coupled plasma atomic emission spectrometry was developed for the extraction, separation and determination of zirconium (Zr) from hafnium (Hf). Zr and Hf were complexed with bis(2,4,4 …

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 …

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 ...

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 …

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 …

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), …

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 …

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

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Phosphorus is an essential element of life but can lead to eutrophication if present above limit in waterways. Hydrous metallic oxides-based magnetic nanoparticle is considered as an easily separable adsorbent for efficient separation of phosphate from sewage. In this paper, superparamagnetic particles consisting of hafnium-modified hydroxides loading …

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 influence of Aliquat 336 concentration in the organic phase on Zr and Hf separation was examined for 7 M HCl with toluene as solvent (Fig. 4). Figure 4. Effect of Aliquat 336 concentration in ...

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

Zirconium is an ideal material for nuclear reactors due to its low absorption cross-section for thermal neutrons, whereas the typically …

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.

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 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 …

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

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 ...

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 ...