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zirconium hafnium separation

(PDF) Separation of Zirconium and Hafnium: A Review

The separation processes are roughly classified into hydro- and pyrometallurgical routes. The current dominant zirconium production route involves pyrometallurgical ore cracking, multi-step...

Separation of Zirconium and Hafnium: A Review

高达12%返现 The separation processes are roughly classified into hydro- and pyrometallurgical routes. The current dominant zirconium production route involves pyrometallurgical ore cracking, multi-step hydrometallurgical liquid-liquid extraction for hafnium removal and the reduction of zirconium tetrachloride to the pure metal by the Kroll process.

ZIRCONIUM-HAFNIUM SEPARATION (Technical Report)

ZIRCONIUM-HAFNIUM SEPARATION Abstract During 33 months of operation the purification plant at Albany, Oreg., processed 2,500,000 pounds of commercial zirconium tetrachloride to produce lowhafnium zirconium oxide and low-zirconium hafnium oxide.

US3966458A Separation of zirconium and hafnium

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 introduction into reduction units for the production of the respective metals by virtue of controlled ratios of the salt

ZIRCONIUM-HAFNIUM SEPARATION (Technical Report)

@article{osti_4247043, title = {ZIRCONIUM-HAFNIUM SEPARATION}, author = {Stickney, W A}, abstractNote = {During 33 months of operation the purification plant at Albany, Oreg., processed 2,500,000 pounds of commercial zirconium tetrachloride to produce lowhafnium zirconium oxide and low-zirconium hafnium oxide. TMe average hafnium content of the zirconium oxide was about 40

Separation of Zirconium and Hafnium: A Review SpringerLink

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

US4072506A Method of separating hafnium from zirconium

A method for separating hafnium and zirconium is disclosed in which unseparated zirconium and hafnium are dissolved in the molten state in a solvent metal, preferably zinc. This molten metal phase is contacted with a fused salt phase which includes a zirconium salt as one of its components. The desired separation is effected by mutual displacement, with hafnium being transported from the

(PDF) Zirconium and Hafnium Separation, Part 3. Ligand

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.

Separation of Hafnium from Zirconium and Their

zirconium is eluted with a 10 percent sulfuric acid solution. For samples containing more than about 20 percent of zirconium the hafnium fraction may contain some zirconium and a second separation using the column is necessary to insure complete separation. The hafnium and zirconium are pre-cipitated with cupferron, ignited, and weighed as HfO2

Separation of hafnium from zirconium by anion exchange

Separation of Hafnium From Zirconium by Anion Exchange John 1. Hague and Lawrence A. Machlan (September 13, 1960) The resul ts of a systematic survey of the elution of hafnium and zirconium in diluted sulfuric acid, and i!1 solutions of hydrochloric and sulfuric acids in water, are presented.

Separation of zirconium and hafnium using Diphonix

Feb 01, 2009 Fig. 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 suggests that resins with similar functional groups but with

US2938769A Separation of hafnium from zirconium Google

US2938769A US301902A US30190252A US2938769A US 2938769 A US2938769 A US 2938769A US 301902 A US301902 A US 301902A US 30190252 A US30190252 A US 30190252A US 2938769 A US2938769 A US 2938769A Authority US United States Prior art keywords zirconium hafnium thiocyanate column hexone Prior art date 1952-07-31 Legal status (The legal status is an assumption

Zirconium and Hafnium Separation, Part 3. Ligand‐Enhanced

(2006). Zirconium and Hafnium Separation, Part 3. Ligand‐Enhanced Separation of Zirconium and Hafnium from Aqueous Solution using Nanofiltration. Separation Science and Technology: Vol. 41, No. 13, pp. 2883-2893.

Study of Zirconium and Hafnium Separation by Solvent

The extraction and separation behavior of zirconium and hafnium has been widely studied. There are several reports on the separation of these elements in different media and extractants. Figure 1 shows the structure of the extractants used in this work for the extraction of the zirconium and hafnium [16]. 3. Experimental. 3.1. Feed Solutions

Review of anhydrous zirconium-hafnium separation

@article{osti_6943282, title = {Review of anhydrous zirconium-hafnium separation techniques. Information circular/1984}, author = {Skaggs, R L and Rogers, D T and Hunter, D B}, abstractNote = {Sixteen nonaqueous techniques conceived to replace the current aqueous scheme for separating hafnium and zirconium tetrachlorides were reviewed and evaluated by the Bureau of Mines.

Separation of zirconium from hafnium in sulfate medium

May 01, 2017 BEAP (B) was used to separate zirconium from hafnium with a separation factor of 6.8 under optimum conditions. The content of HfO 2 in ZrO 2 product was decreased from 3% in the feed to 0.6% in the Zr product after counter-current operation. The extracted complexes can be determined to be ZrO(HSO 4) 2 ·3B and HfO(HSO 4) 2 ·2B for Zr and Hf

The Ion-Exchange Separation of Zirconium and Hafnium UNT

Although the conditions which give satisfactory separation were first worked out using microgram amounts of material and the radioactive tracer technique, the run described here, involving milligrams of material, illustrates the applicability of the method to the production of significant amounts of pure hafnium and zirconium.

US3006719A Solvent extraction process for separating

US3006719A US672383A US67238357A US3006719A US 3006719 A US3006719 A US 3006719A US 672383 A US672383 A US 672383A US 67238357 A US67238357 A US 67238357A US 3006719 A US3006719 A US 3006719A Authority US United States Prior art keywords hafnium zirconium iron column solution Prior art date 1957-07-17 Legal status (The legal status is an assumption and is not a

ZIRCONIUM-HAFNIUM SEPARATION (Technical Report)

@article{osti_4247043, title = {ZIRCONIUM-HAFNIUM SEPARATION}, author = {Stickney, W A}, abstractNote = {During 33 months of operation the purification plant at Albany, Oreg., processed 2,500,000 pounds of commercial zirconium tetrachloride to produce lowhafnium zirconium oxide and low-zirconium hafnium oxide. TMe average hafnium content of the zirconium oxide

(PDF) Separation of Zirconium and Hafnium by Extraction

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

Zirconium and hafnium separation with molten salt

Zirconium and hafnium separation with molten salt extraction in Sn–Cu–Zr–Hf and Cu–Zr–Hf alloy systems L. Xua,b, Y. Xiaoc,d, A. van Sandwijkd, Z. Zhaoc,J.Lia,e,Q.Xuf, and Y. Yanga,c aDepartment of Materials Science and Engineering, Delft University of Technology, Delft, The Netherlands; bSchool of Materials Science and Metallurgy, Northeastern University,

(PDF) Zirconium and Hafnium Separation, Part 3. Ligand

The hafnium-to-zirconium separation factor is approximately constant (≈8) over the 0.5–3 N range. Under certain conditions, an unseparated fraction

Zirconium and Hafnium Separation, Part 3. Ligand‐Enhanced

(2006). Zirconium and Hafnium Separation, Part 3. Ligand‐Enhanced Separation of Zirconium and Hafnium from Aqueous Solution using Nanofiltration. Separation Science and Technology: Vol. 41, No. 13, pp. 2883-2893.

Separation of Hafnium from Zirconium and Their

zirconium is eluted with a 10 percent sulfuric acid solution. For samples containing more than about 20 percent of zirconium the hafnium fraction may contain some zirconium and a second separation using the column is necessary to insure complete separation. The hafnium and zirconium are pre-cipitated with cupferron, ignited, and weighed as HfO2

Separation of hafnium from zirconium by anion exchange

Separation of Hafnium From Zirconium by Anion Exchange John 1. Hague and Lawrence A. Machlan (September 13, 1960) The resul ts of a systematic survey of the elution of hafnium and zirconium in diluted sulfuric acid, and i!1 solutions of hydrochloric and

Zirconium and hafnium separation in sulfate solutions

Zirconium and hafnium separation kinetics have been shown to be temperature dependant with the maximum separation factor obtained between about 0° C. and 5° C. Thus, by controlling the column temperature and also the temperature of the feedstock and eluant solutions, the present invention tends to optimize the separation of zirconium from

Separation of zirconium and hafnium by solvent extraction

May 31, 2011 Extraction 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

Separation of zirconium and hafnium using Diphonix

Feb 01, 2009 Fig. 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 suggests that resins with similar

Separation of Zirconium and Hafnium from Early Actinides

Sep 18, 2021 @article{osti_1827515, title = {Separation of Zirconium and Hafnium from Early Actinides and Rare Earth Elements with Eichrom s Pb Resin in HCl}, author = {Kmak, K N and Despotopulos, J D and Scielzo, N D}, abstractNote = {}, doi = {10.1007/s10967-021-07990-8}, journal = {Journal of Radioanalytical and Nuclear Chemistry}, number = N/A, volume

Separation of zirconium from hafnium in sulfate medium

May 01, 2017 BEAP (B) was used to separate zirconium from hafnium with a separation factor of 6.8 under optimum conditions. The content of HfO 2 in ZrO 2 product was decreased from 3% in the feed to 0.6% in the Zr product after counter-current operation. The extracted complexes can be determined to be ZrO(HSO 4) 2 ·3B and HfO(HSO 4) 2 ·2B for Zr and Hf

Highly efficient and selective solvent extraction of

Nuclear-grade zirconium (Zr) and hafnium (Hf) play an inevitably strategic role in the sustainable development of the nuclear industry. However, the efficient separation of Zr ions and Hf ions is still problematic due to their approximate ionic radii.

Method of separation of zirconium and hafnium

The closest analogue is known a method in which the separation of zirconium and hafnium perform a 60%solution of TBP in sulfonated kerosene from a nitric acid solution containing 56 g/l Zr, 0,785 g/l Hf [1,2% Σ(Zr+Hf)], 8,39 M HNO 3 when the ratio of organic and aqueous phase is 1:1 in a pulse column.