· TOA-H 2 SO 4 system has the shortage of low extraction capacity, long process and poor zirconium/ hafnium separation performance. 3,5,7 To seek more efficient and eco-friendly zirconium/ hafnium
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:Shuai Ma, Fan Yang, Fengzhi Tan, Meiying Xie, Shuwen Yu, Liyan Xue, Zhiwan Li, Tianxi Hu · 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
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dense medium cyclones, selecting appropriate separation equipment for specific ores will be the focal point of this study (Veaseyet al., 1993; Ambróset al., 2023; Jordenset al., 2014). The separation efficiency of each equipment is influenced by numerous
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Concretely, zirconium possesses an exceedingly low thermal neutron capture cross-section, only 0.18 × 10-28 m 2, while hafnium has a much higher cross-section of 115 × 10-28 m 2, approximately 640 times that of zirconium [3], [4].
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:John C. Haygarth, Ronald A. GrahamPublish Year:2013 · In this work, melamine foam-based zirconium-chitosan composites were prepared and their scavenging properties for Sb(III) and Sb(V) were researched. MF's macroscopic size structure provided support for the easy separation of
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A process is provided for separating zirconium and hafnium tetrachlorides by the direct distillation from their solution in an eutectic mixture of sodium and potassium chlorides. Hafnium tetrachloride and zirconium tetrachloride are provided in adequate purity for direct
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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 classified into hydro-
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:Zirconium Separation TechnologyAZS MachineAutomatic Zircon SeparatorOne-step purification of ethylene from ternary mixtures (C2H2, C2H4, and C2H6) can greatly reduce the energy consumption of the separation process, but it is extremely
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· The recovery of Nd and Dy from a ternary Co–Nd–Dy system using layered crystalline zirconium phosphate (α-ZrP) was investigated. α-ZrP was synthesized by the refluxing method, and subsequently characterized by sodium hydroxide titration, Fourier transform-infrared spectrometry, thermogravimetry, scanning electron
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A new process for the separation of hafnium from zirconium has been developed, based on the repeated reaction of the mixed tetrachloride vapors of zirconium and hafnium with alkali metal chloride salts in a solid form. Hafnium tends to remain in the condensed phase while zirconium concentrates in the vapor phase.
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· It was, therefore, not possible to prepare reactor-grade zirconium in a single stage. After several trials it was possible to find nearly optimum conditions for the separation. Finally, reactor-grade zirconium was obtained in three stages of precipitation with an yield of ∼24%.
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· As scandium and zirconium are commonly associated elements, Zr is a kind of main impurities in high purity Sc 2 O 3 product. In the product of 99.9% grade Sc 2 O 3, the content of ZrO 2 should be less than 0.005% [6]. The mutual separation of Sc and Zr is
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Corpus ID: 101599400 Mechanisms of extraction and separation of zirconium and hafnium by DIBK-P204 system @article{Zhiga2013MechanismsOE, title={Mechanisms of extraction and separation of zirconium and hafnium by DIBK-P204 system}, author={Xu Zhi
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· The present study aims at the separation of scandium and zirconium from the Brazilian bauxite residue. The acid leaching was carried out using 20% of H2SO4, S/L ratio equals 1/10, for 8 h at 90 °C.
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· Abstract Membrane filtration equipment was used to evaluate zirconium and hafnium separation efficiency by a membrane separation process. High rejection of Zr and Hf species in aqueous solution were obtained with nanofiltration and ultrafiltration membranes. This
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· 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
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· High purity zirconium oxy chloride synthesis method has been developed from zircon sand of Chatrapur beach placer deposit of IREL Odisha. Chemical method of purification is found to be suitable means of producing high purity zirconium oxy chloride with very low radioactivity. Complexing agent such as pentetic acid or
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· A Hf ion imprinted membrane (IIM) separation system was successfully prepared for the first time. • IIMs realize the preferential and high-efficiency enrichment of Hf ions by a short process. • IIMs can increase C Hf /C Zr
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· Acidity is the variable that most influences the separation of zirconium and hafnium under the conditions evaluated. The equations proposed for the equilibrium and stoichiometric coefficients were
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· It was found that Zr (IV) is extracted more readily by CYANEX 923 than by CYANEX 925. The separation of Zr (IV) and Hf (IV) has been investigated using different extractants (9) (10) (11). It was
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· In this study, the sorption behavior of yttrium and strontium onto Dowex-S/S and synthesized zirconium titanium phosphate as cation exchanger from nitric acid medium was investigated using batch technique. The synthetic exchanger has been characterized by different analytical tools. Distribution behavior of Sr(II) and Y(III) as a
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· possibility of separation of zirconium from strontium and yttrium were evaluated by anal yzing the is otopes 88 Sr, 89 Y, 90 Zr, 91 Zr, and 103 Rh by ICP-MS at least three times. II. Results and
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Zircon sand beneficiation is removing impurity minerals from zircon sand ore and increasing the content of zircon sand ore. We determine the beneficiation process and equipment configuration according to the zircon placer’s specific mineral composition and properties. The common zircon sand beneficiation process is a composite beneficiation
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· The separation of hafnium from zirconium was fairly completed, and the separation coefficient (β) was 25−30. In each of the effluent fractions which were collected prior to 1 900 mL, the hafnium concentration was below 0.015%, whereas zirconium was retained in the solution, and therefore, high purity zirconium could be recovered
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· 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 Metals Vacuum Arc Consolidation
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Additionally, they proposed that the separation factor of zirconium and hafnium could be increased by increasing SCN − concentration and decreasing HCl concentration []. Otsuka investigated the effect of the concentrations of SCN − and H + in the aqueous phase and the concentration of HSCN in the organic phase on the distribution ratio and separation
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· Determination of Microamounts of Hafnium in Zirconium Using Inductively Coupled Plasma Atomic Emission Spectrometry and Inductively Coupled Plasma Mass Spectrometry during Their Separation by Ion
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:Publish Year:2020Machine Learning SeparationYing Wu, Haipeng Duan, Hongxia Xi · Summary. This chapter contains sections titled: Topical Index. Introduction. Literature Resources on Zirconium and Hafnium. Discovery and History. Occurrence.
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· 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
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:Functional Silica Composite ResinPublish Year:2019 · 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
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Trituradora de piedra vendida por proveedores certificados, como trituradoras de mandíbula/cono/impacto/móvil, etc.
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