Under these conditions, the separation factor of zirconium and hafnium is 9.2 with a maximum extraction percentage of 96.58 % of zirconium. The optimum conditions for stripping of zirconium were ...
DetailsZirconia fiber membranes based on PVDF as high-safety separators for lithium-ion batteries using a papermaking method. Original Paper. Published: 25 October 2018. …
DetailsHere, in this study, we report that zirconia toughened alumina (ZTA)-based separator membrane exhibits less ohmic resistance 0.15 Ω·cm 2 and low hydrogen gas …
DetailsA sensitive and selective method for the solvent extraction, separation, transportation and microgram determination of zirconium(IV) with dibenzo-18-crown-6 is described.Zirconium(IV) is extracted with dibenzo-18-crown-6 from 0.1 M HCl and separated from hafnium.The extraction mechanism of zirconium from HCl media was …
DetailsZirconium 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 …
DetailsThe separation of methane, a commercially important fuel and greenhouse gas, from nitrogen is a very important and challenging issue. To address this problem, we systematically incorporated various functional groups (-H, -NH 2, -NO 2, -Br, and -Br 2) into the pores of a hydrothermally stable zirconium-based metal–organic framework …
DetailsZirconium 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 …
DetailsIn this work, a porous hydrophilic skin layer with ∼ μ m thick of polyvinyl alcohol (PVA) has been successfully constructed and casted onto the thin zirfon-type separator composite …
DetailsA sensitive and selective method for the solvent extraction, separation, transportation and microgram determination of zirconium(IV) with dibenzo-18-crown-6 is described. Zirconium(IV) is extracted with dibenzo-18-crown-6 from 0.1 M HCl and separated from hafnium. The extraction mechanism of zirconium from HCl media was …
DetailsOne-step separation of high-purity ethylene (C 2 H 4) from C 2 hydrocarbon mixture is critical but challenging because of the very similar molecular sizes and physical properties of C 2 H 4, ethane (C 2 H 6), and acetylene (C 2 H 2).Herein, we report a robust zirconium metal–organic framework (MOF) Zr–TCA (H 3 TCA = 4,4′,4″ …
DetailsEngineering metal–organic frameworks (MOFs) for adsorptive ethylene/ethane separation has shown bright prospects for replacing the energy-intensive cryogenic distillation process. Herein, we demonstrate that pore size reduction in zirconium metal–organic frameworks (Zr-MOFs) can significantly improve their ethylene/ethane separation …
DetailsThe designability and ultrahigh stability of zirconium–organic frameworks make them attractive adsorbents for noble gases xenon (Xe) and krypton (Kr), but their Xe/Kr separation performance needs to ...
DetailsHere, in this study, we report that zirconia toughened alumina (ZTA)–based separator membrane exhibits less ohmic resistance 0.15 Ω·cm 2 and low hydrogen gas …
DetailsDendrite suppression with zirconium (IV) based metal–organic frameworks modified glass microfiber separator for ultralong-life rechargeable zinc-ion batteries. ... Additionally, the modification of a separator is an alternative way to suppress zinc dendrite. A separator, an important part of batteries, is a permeable membrane placed between ...
DetailsConstructed from hexanuclear zirconium (IV) clusters [Zr 6 (μ 3-O) 4 (μ 3-OH) 4] 12+ and multitopic carboxylate linkers, Zr 6-based metal–organic frameworks (Zr-MOF) have attracted remarkable interest due to their exceptional robustness and structural versatility.The abundant aqua, hydroxyl, and μ 3-hydroxo ligands [37] on the surface of …
DetailsFrom 1 to 4 M HCl medium, zirconium was selectively extracted over hafnium by organophosphorous extractants (D2EHPA, PC88A, Cyanex 272). In order to increase the separation factor Zr/Hf, mixtures o...
DetailsWastewater Treatment and Reuse. Y. Gong, D. Zhao, in Comprehensive Water Quality and Purification, 2014 3.11.2.5 Magnetic Separation. Magnetic separation is a process where a contaminant is first attached onto a magnetic carrier material (e.g., magnetite), and subsequently, the contaminant-laden carrier is separated under a magnetic field. The …
DetailsThe development of highly porous and thin separator is a great challenge for lithium-ion batteries (LIBs). However, the inevitable safety issues always caused by poor mechanical integrity and internal short circuits of the thin separator must be addressed before this type of separator can be applied to lithium-ion batteries.
DetailsFig. 5 presents the results of separation of Zr and Hf using Monophos® resin containing monophosphonic and sulfonic acid groups, which has never been applied yet in Hf and Zr separation. However the separation of zirconium and hafnium was significantly poorer than that obtained in the case of Diphonix® ion exchanger. This …
DetailsMaximising metal separation and recovery from e-waste is the focus for Bunting on stand C60 at the E-Waste World Conference and Expo (26-27 June 2024, Messe Frankfurt, Germany). ... High-intensity magnetic separators, including the Stainless Steel Magnetic Separator, recover small and weakly magnetic metals including …
DetailsExtraction and separation of zirconium from hafnium using Cyanex 923 as extractant cannot be performed for the zirconium concentrations of higher than 8 g/l, due to formation of third phase. As is obvious from Table 4, the separation factor of 186 reported in this work for the separation of zirconium and hafnium is significantly higher than ...
DetailsOne commonly used type of diaphragm in alkaline electrolyzers is the Zirfon separator, which consists of a PPS fabric that is symmetrically coated with a slurry of PSU and …
DetailsTraditionally, alkaline water electrolysis (AWE) uses diaphragms to separate anode and cathode and is operated with 5–7 M KOH feed solutions. The ban of asbestos diaphragms led to the development of polymeric diaphragms, which are now the state of the art material. A promising alternative is the ion solvating membrane. Recent developments show that …
DetailsSeparation of zirconium and hafnium is one of the challenging problems due to their similar chemical behaviors and in general, their separation has been carried out under very high acidic conditions. Herein, we have proposed novel synthesis and application of modified phosphoric acid based ligands, viz., mono-phosphate …
DetailsZirconium 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 …
DetailsZrP and TiP are widely investigated metal(IV) phosphates that can be obtained in the metal(IV)–H 3 PO 4 system. In the present study, their amorphous and crystal forms (am-ZrP, am-TiP, α-ZrP and α-TiP) have been investigated for the separation of Sc(III) and Fe(III) from acidic media (Fig. 4).Both amorphous and crystalline TiP and …
DetailsThe possibility of enrichment and radioactivity reduction of zirconium concentrate obtained at the Obukhovsky mining and processing plant, located in the North Kazakhstan region, was investigated. The …
DetailsThese materials are available free of charge via the Internet at The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.cgd.7b00090.. Optical images, PXRD patterns, the FT-IR spectra, and thermogravimetric analysis for JLU-Liu34–36, N 2, CO 2, CH 4, C 2 H 6, and C 3 H 8 …
DetailsAfter six regeneration tests of the resin were carried out, the ability of the resin for adsorption and separation zirconium and hafnium was unchanged. The results show that the resin has a good ability to be regenerated and reused. 4 Conclusions 1) The adsorption capacity of the MIBK extraction resin for zirconium and hafnium acidity is ...
DetailsTherefore, this preliminary indicated that the extractant BEAP can be used for the effective separation of zirconium and hafnium. It would be possible to get nuclear zirconium with < 0.01% HfO 2 by using much more extraction and scrubbing stages. Download : Download high-res image (98KB) Download : Download full-size image; Fig. 8.
DetailsThe extraction of zirconium (Zr) and hafnium (Hf) in methyl isobutyl ketone (MIBK)—thiocyanic acid (HSCN) system has been widely used in the production of nuclear-grade zirconium and hafnium in industry, while the extraction mechanism was not adequately studied. In this study, the extraction and stripping equilibrium of Zr and Hf in …
DetailsSynopsis The separation of zirconium and hafnium is essential in the nuclear industry, since zirconium alloys for this application require hafnium concentrations of less than 100 ppm. The separation is, however, very difficult due to the numerous similarities in the chemical and physical properties of these two elements. Traditional …
Detailsgal air separation 1. Introduction The main zirconium minerals in magmatic systems are baddeleyite ... (screw separators) and hydraulic methods (separation in hydrocyclones), are the most commonly ...
DetailsA. van Sandwijk. Zr-Hf-Ti Metallurgie B.V.; Van der Heimstraat 62, Den Haag, SB, The Netherlands. Search for more papers by this author
DetailsHowever, all the existing industrialized Zr/Hf solvent extraction separation methods, namely MIBK(methyl isobutyl ketone)-HSCN, TBP(tributylphosphate)-HNO3 and TOA(trioctylamine)-H2SO4 have shortages. To realize Zr/Hf environment-friendly and efficient separation, novel extractants have always been studied.
DetailsIn this paper, an advanced ion-imprinted membranes (IIMs) separation system was prepared for the first time to achieve efficient separation and enrichment of Hf ions from …
Details1. Introduction. The demand for separation and purification technologies that are sustainable and energy-efficient is becoming increasingly urgent in response to water and energy crises as well as environmental pollution [1], [2]pared to other conventional separation processes such as distillation, adsorption, and crystallization, membrane …
DetailsHafnium (Hf) is an important strategic material for the semiconductor, aerospace and nuclear industries. In this paper, an advanced ion-imprinted membranes (IIMs) separation system was prepared for the first time to achieve efficient separation and enrichment of Hf ions from zirconium oxychloride solutions.
DetailsPE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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