zirconium hafnium solutions

  1. In the course of a rather cursory examination of the elution of tetra-positive ions from the cation exchange resin Dowex 50 with hydrochloric acid solutions, the authors have discovered a very effective method of separating zirconium from hafnimu. In view of the great labor involved in preparing even reasonably pure hafnium compounds by existing methods, they feel that this procedure will ...

  2. Iron is removed from the zirconium-hafnium solution from the feed makeup step by extraction. The iron free zirconium and hafnium solution is passed through a series of liquid-liquid extractions, stripping, and scrubbing steps to separate zirconium from hafnium. Liquid-liquid extraction, using methyl isobutyl ketone (containing thi ocyanate) as a

  3. The feed solutions used were prepared from the liquors obtained from the solubilization of zirconium (Zr(OH) 4) and hafnium (Hf(OH) 4) hydroxides, both provided by Centro Tecnológico da Marinha-São Paulo (CTM)-SP. The product of the alkaline fusion of zircon was also used.

  4. Introduction of scandium, zirconium and hafnium into... 607 plates under 5 m in size. The composition of Al-solid solution and IMC particle inclusions was examined with the use of quantitative MS analysis. The content of elements (mass %) was determined for the upper boundary of the bottom layer particles: Al{62.57 and Sc{32.43 (Al

  5. Solvent extraction of zirconium(IV) from acid chloride solutions using LIX 84IC. Download. ... LIX 84-IC (2-hydroxy-5-nonylacetopheno- Zirconium and hafnium co-exist in nature, but neoxime in a mixture with a high flash point they have opposite nuclear characteristics. Thus, hydrocarbon diluent) is a solvent extraction reagent they have to be ...

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  7. Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals.Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1923, by Coster and Hevesy, making it the last stable element to be discovered.

  8. US3095270A US795597A US79559759A US3095270A US 3095270 A US3095270 A US 3095270A US 795597 A US795597 A US 795597A US 79559759 A US79559759 A US 79559759A US 3095270 A US3095270 A US 3095270A Authority US United States Prior art keywords solution zirconium silica weight percent Prior art date 1959-02-26 Legal status …

  9. zirconium-hafnium separation, preparation of ZrOz from zirconyl solution by precipitation and calcination, chlorination of ZrO2 to anhydrous chloride and conversion of chloride to metal by Kroll reduction. This particular combination of hydro and pyrometallurgical operations in zirconium metal production leads to poor ...

  10. From 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 of organophosphorous extractants with amines (Alamine 336, Aliquat 336) or cationic extractants (Versatic acid 10, LIX 63) were employed in 1–4 M HCl medium.

  11. Zirconium nitrate can be used as a Lewis acid catalyst in the formation of N-substituted pyrroles. A mixed aqueous solution of hafnium nitrate and zirconium nitrate can be separated by partitioning the zirconium into tributylphosphate dissolved in kerosene. Zirconium free from hafnium is required for nuclear reactor construction.

  12. Some long-chain primary, secondary, and tertiary amines were applied to the extraction and separation of zirconium and hafnium from solutions containing various concentrations of hydrochloric acid. The effect of temperature on extraction and separation factor was also investigated.

  13. 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.

  14. Hudswell (8) has reviewed the separation of hafnium and zirconium prior to 19U9. Hafnium-free zirconium has been prepared by adsorption of hafnium from a methanol solution on activated silica gel (2, 7, 13J 16). Huffman and Beaufait (9) have used liquid-liquid

  15. Zirconium is a chemical element with the symbol Zr and atomic number 40. The name zirconium is taken from the name of the mineral zircon (the word is related to Persian zargun (zircon;zar-gun, "gold-like" or "as gold")), the most important source of zirconium. It is a lustrous, grey-white, strong transition metal that closely resembles hafnium and, to a lesser extent, titanium.

  16. PROPERTIES OF ZIRCONIUM 2.1 Physical Properties Zirconium is the 40. th . element in the periodic table. It belongs to the titanium subgroup, subgroup IVB, in which hafnium is also placed. Zirconium occurs naturally in the form of five isotopes with mass numbers of 90, 91, 92, 94 and 96 and corresponding natural

  17. The tributyl phosphate liquid-liquid extraction process removes hafnium from aqueous solutions of zirconium tetrachloride, yielding as final product recrystallized zirconyl chloride octahydrate containing less than 100 ppm of hafnium.

  18. The preparation and properties of a zirconium and hafnium peroxy compound. Journal of Inorganic and Nuclear Chemistry 1964, 26 (4), 519-524. DOI: 10.1016/0022-1902(64)80283-9. Velmer A. Fassel, Charles H. Anderson. Quantitative Spectrographic Analysis of Zirconium-Hafnium Mixtures*.

  19. Hafnium Acetate Solutions are moderate to highly concentrated liquid solutions of Hafnium Acetate.They are an excellent source of Hafnium Acetate for applications requiring solubilized materials. Acetates are excellent precursors for production of ultra high purity compounds and certain catalyst and nanoscale (nanoparticles and nanopowders) materials.

  20. 1000 µg/mL Zinc in 2% HNO3 This standard is traceable to NIST SRM 3168 and certified ISO 17034 and 17025 18 Month Expiry Date Safety Data...

  21.  · This paper reviews the crystal chemistry, synthesis, densification, microstructure, mechanical properties, and oxidation behavior of zirconium diboride (ZrB 2) and hafnium diboride (HfB 2) ceramics.The refractory diborides exhibit partial or complete solid solution with other transition metal diborides, which allows compositional tailoring of properties such as thermal expansion coefficient ...

  22. Zirconium's main minerals are zircon and baddeleyite. The viable methods of producing titanium, zirconium, and hafnium from oxide ores encounter two problems. In the first place, reduction with carbon is not possible because of the formation of intractable carbides, and even reduction with Na, Ca, or Mg is unlikely to remove all the oxygen.

  23. Method of separating zirconium and hafnium, including extraction of zirconium and g is fne from nitric acid solution with a solution of tributyl phosphate in an organic diluent and reextraction zirconium and hafnium, characterized in that the extraction of zirconium and hafnium carry out 70%solution of TBP in the organic solvent, reextraction ...

  24. US2316141A US346059A US34605940A US2316141A US 2316141 A US2316141 A US 2316141A US 346059 A US346059 A US 346059A US 34605940 A US34605940 A US 34605940A US 2316141 A US2316141 A US 2316141A Authority US United States Prior art keywords zirconium carbonate acid solution precipitate Prior art date 1940-07-17 Legal …

  25. Etching of Zirconium Oxide, Hafnium Oxide, and Hafnium Silicates in Dilute Hydrofluoric Acid Solutions - Volume 19 Issue 4 - Viral Lowalekar, Srini Raghavan ... agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.

  26.  · The Hafnium-Selective Extraction Fom a Zirconium(Hafnium) Heptafluoride Ammonium Solution Using Organophosphorus-Based Extractants. Elizabeth Wilhelmina Conradie Chemical Resource Beneficiation ... (Hafnium) Heptafluoride Ammonium Solution Using Organophosphorus-Based Extractants

  27. Amaral, J. and Antônio de Morais, C. (2016) Study of Zirconium and Hafnium Separation by Solvent Extraction Technique from Nitric and Hydrochloric Solutions with Acid, Basic and Neutral Extractants. World Journal of Engineering and Technology, 4, 138-150. doi: 10.4236/wjet.2016.43D017.

  28. Refractory Diborides of Zirconium and Hafnium. ... HEB materials are solid solutions of individual transition metal diborides that have attracted increasing interest due to the high thermal and ...

  29. Zirconium and hafnium separation from chloride solutions by organophosphorous compounds by A. B. Vianna da Silva Jr. Department ofMiningand Metallurgical Engineering McGill University Montreal, Quebec, Canada September, 1996 Thesis submitted to theFaculty ofGraduate Studies and Research in partial fulfillment ofthe requirements for the degree ...

  30. US3095270A US795597A US79559759A US3095270A US 3095270 A US3095270 A US 3095270A US 795597 A US795597 A US 795597A US 79559759 A US79559759 A US 79559759A US 3095270 A US3095270 A US 3095270A Authority US United States Prior art keywords solution zirconium silica weight percent Prior art date 1959-02-26 Legal status (The legal status is an assumption and is not a …