Extraction and Separation of Zirconium(IV) and Hafnium(IV) from Chloride Media Using Magnetic Resin with Phosphoric Acid Functionality

Donia, Ahmed M.; Atia, Asem A.; Daher, A. M.; Elshehy, Emad A.

doi:10.1080/01932691003656730

Cited by 26 publications

(14 citation statements)

References 28 publications

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“…The zircon concentrate sample was digested by caustic method using NaOH pellets (1:1.25) by weight, 1 Kg zircon concentrate with 1.25 Kg sodium hydroxide. The mixture was homogenized in a 2 liters stainless-steel container and fed into an electric furnace where the fusion reaction took place at 650 o C and continued for 2 hours [18]. The fused product was washed with 4-folds of its weight with hot DDW.…”

Section: Digestion Of Egyptian Zirconmentioning

confidence: 99%

Extraction chromatography and fractional precipitation procedures for production various zirconium grades for industrial and nuclear interest from Egyptian zircon ore

Abdelsamad

Attallah

Afifi

et al. 2021

Arab Journal of Nuclear Sciences and Applications

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The present study describes purification of zirconium from hafnium from the Egyptian zircon ore, by selective leaching, successive precipitations and two analytical techniques. The obtained results indicated that three fractions of Zr-concentrates were obtained by selective precipitation of the leached solution, namely: PPt-A, PPt-B and PPt-C. In the precipitation process, the PPt-B fraction, Zr exists with actinides (U and Th) and less than 0.002% of the original hafnium in the mother solution. This zirconium fraction, PPt-B, was further purified by fractional precipitation or anion exchange chromatography. The purity of Zr obtained by both methods reached 99%. Meanwhile, recoveries were varied between 64% by fractional precipitation and 95% by anion exchange chromatography. The ratio of Hafnium to zirconium was 24 x 10-3 in original Egyptian zircon concentrate. This ratio decreased to 17x10-3, 2.17x10-3, and 3.52x10-3 for PPt-A, PPt-B and PPt-C fractions respectively. Further decrease in ratio of hafnium to zirconium to 0.18x10-3 and 0.15x10-3 occurred for anion exchange chromatography and fractional precipitation techniques.

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Section: Digestion Of Egyptian Zirconmentioning

confidence: 99%

Extraction chromatography and fractional precipitation procedures for production various zirconium grades for industrial and nuclear interest from Egyptian zircon ore

Abdelsamad

Attallah

Afifi

et al. 2021

Arab Journal of Nuclear Sciences and Applications

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“…The fabrication of commercial mesoporous sodium zirconium phosphate ion-exchanger from zircon was carried out in three main steps, as follows: (i) a sample of 1 g of Rosetta zircon concentrate was mixed with 1.25 g of sodium hydroxide and charged to a 316-L stainless steel high pressure crucible (height = 5 cm, diameter = 1.5 cm). The crucible was then fed to the electric furnace where the fusion reaction took place [33]. The reaction temperature was adjusted at 500 • C and continued for 1h.…”

Section: Fabrication Of Commercial Mesoporous Nazrp-cexmentioning

confidence: 99%

Fabrication of Mesoporous NaZrP Cation-Exchanger for U(VI) Ions Separation from Uranyl Leach Liquors

Alhindawy

Elshehy

El‐Khouly

et al. 2019

Colloids and Interfaces

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As the demand for uranium production-based energy worldwide has been increasing in the last decades to maintain nuclear growth for electricity production, there are great efforts towards developing an easy and inexpensive method for uranium extraction and separation from its ores. For this purpose, mesoporous inorganic cation exchangers provide an efficient separation technology that can help streamline production and lower overall cost. This study describes the development of nano-structured mesoporous sodium zirconium phosphate (NaZrP-CEX) for separation and extraction of uranyl ions from real samples. The fabricated NaZrP-CEX was well characterized by various techniques such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Scanning Electron Microscope (SEM), N2 adsorption/desorption, Dynamic light scattering (DLS) and zeta potential). The kinetics/thermodynamic behaviors of uranyl ion adsorption into NaZrP-CEX from an aqueous solution were minutely studied. The kinetic studies showed that the pseudo-second order model gave a better description for the uptake process. The negative value of ΔG indicate high feasibility and spontaneity of adsorption. Finally, mesoporous NaZrP-CEX can be regenerated using both of HNO3 (0.05 M) or HCl (1 M) up to seven cycles of operation.

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“…At lower pH values, the active groups of the HB/A@Si-MNS get protonated and the interaction between the protonated HB/A@Si-MNS and cationic species of Zr(IV) and Hf(IV) is reduced. The interaction of Zr(IV) and Hf(IV) with the HB/A@Si-MNS may take place through a complex formation with the donor sites of amino groups, as well as the oxygen atoms of the phenolic hydroxyl group, and coordination type, as suggested in Figure 1 [1,2,9,21,24]. The observed decrease in the uptake of Zr(IV) and Hf(IV) at pH > 3 can be explained on the basis of the formation of various oligomeric and monomeric hydrolyzed species of Zr(IV) and Hf(IV) with lower adsorption affinities to HB/A@Si-MNS.…”

Section: Effect Of Ph On the Batch Adsorption Processmentioning

confidence: 99%

“…The selective separation experiments were studied using the batch method. The separating factor (S) was calculated using the following equation [1,2].…”

Section: Selective Separation Of Hf(iv) From Zr(iv) Metal Ionsmentioning

confidence: 99%

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Fabrication of Silica Microspheres (HB/A@SI-MNS) for Hafnium and Zirconium Recovery from Zirconyl Leach Liquor

El‐Magied

Salem

Daher

et al. 2018

Colloids and Interfaces

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This work describes the synthesis of silica microspheres using sodium silicate obtained as a byproduct in the production of Egyptian Rosetta zircon concentrate. The obtained mesoporous silica microspheres were further modified with aminopropyltriethoxy silane and 2,4-Dihydroxybenzaldehyde to produce Schiff's base silica sorbent (HB/A@Si-MNS). HB/A@Si-MNS was used for the selective extraction of hafnium from zircon mineral leach liqueur. The fabrication process and surface properties of HB/A@Si-MNS were confirmed by the means of X-ray Fluorescence (XRF), scanning electron microscop (SEM), energy depressive X-ray (EDX), Fourier-transform infrared spectroscopy (FT-IR), and elemental analysis. The uptake behavior of HB/A@Si-MNS towards Zr(IV) and Hf(IV) ions were studied under different experimental conditions. Adsorption curves indicate that the uptake of Zr(IV) and Hf(IV) on HB/A@Si-MNS is a spontaneous, endothermic monolayer system controlled by intraparticle diffusion. Elution efficiencies were found to be 94% and 98% for Zr(IV) and Hf(IV), respectively. The regenerated HB/A@SI-MNS showed uptake capacity comparable to that of fresh ones over 3 cycles. The results of the extraction of Hf(IV) than Zr(IV) from Rosetta zircon concentrate show that HB/A@SI-MNS has a preferential selectivity towards Hf(IV) than Zr(IV). Therefore, the studied material may be promising for the selective separation of Hf(IV) from Zr(IV).

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Extraction and Separation of Zirconium(IV) and Hafnium(IV) from Chloride Media Using Magnetic Resin with Phosphoric Acid Functionality

Cited by 26 publications

References 28 publications

Extraction chromatography and fractional precipitation procedures for production various zirconium grades for industrial and nuclear interest from Egyptian zircon ore

Extraction chromatography and fractional precipitation procedures for production various zirconium grades for industrial and nuclear interest from Egyptian zircon ore

Fabrication of Mesoporous NaZrP Cation-Exchanger for U(VI) Ions Separation from Uranyl Leach Liquors

Fabrication of Silica Microspheres (HB/A@SI-MNS) for Hafnium and Zirconium Recovery from Zirconyl Leach Liquor

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