Zirconium tetrafluoride - Wikipedia
Zirconium fluoride is used as a zirconium source in oxygen-sensitive applications, e.g. metal production. Zirconium fluoride can be purified by distillation or sublimation. Conditions/substances to avoid are: moisture, active metals, acids and oxidizing agents.
Titanium, Zirconium and Hafnium - ScienceDirect
Zirconiums 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.
Method for preparing ultra-pure zirconium and …
25-3-1986 · Commercially available zirconium and hafnium tetrafluorides generally have cation anion and carbon contaminant levels which are unacceptably high. Accordingly, it is necessary to purify these two metal tetrafluoride commercial materials prior to their …
Hafnium - Wikipedia
Hafnium is een glanzend en buigzaam metaal met uitstekende corrosiebestendigheid. Chemisch gezien vertoont het veel overeenkomsten met zirkonium en daardoor zijn deze elementen moeilijk van elkaar te onderscheiden. Het opmerkelijkste verschil is de dichtheid; die van hafnium …
US4578252A - Method for preparing ultra-pure …
A method for preparing ultra-pure metal tetrafluorides in which 3d such as Fe impurities are separated from impure material by a combined vaporization-electrolytic separation procedure. Sublimation and distillation methods are disclosed in combination with electrolytic separation by both emf-series displacement (ESD) and direct melt electrolysis (DME).
Zirconium - Wikipedia
Separation of zirconium and hafnium. Commercial zirconium metal typically contains 1–3% of hafnium, which is usually not problematic because the stone properties of hafnium and zirconium are very similar. Their neutron-absorbing properties differ strongly, however, necessitating the separation of hafnium from zirconium for nuclear reactors.
Zirkonium - Wikipedia
Zirkonium wordt in de industrie voornamelijk gebruikt als zirkoon (ZrSiO 4) voor het maken van mallen die gebruikt worden bij het gieten van andere metalen en het polijsten van keramische materialen. Zirkoon wordt ook wel gebruikt als natuurlijke edelsteen in juwelen. Andere toepassingen zijn: Zirkonium is een slechte absorbeerder voor neutronen.
Preparation of zirconium and hafnium metals by bomb ...
Preparation of zirconium and hafnium metals by bomb reduction of their fluorides Abstract A bomb process for preparing zirconium and hafnium metals with calcium by the reduction of their tetrafluorides is described. A detailed method of preparing the high purity tetrafluorides is …
v115n10a10 A theoretical approach to the sublimation ...
A theoretical approach to the sublimation separation of zirconium and hafnium in the tetrafluoride form Area-dependent sublimation rate MacFarlane et al. (2002) calculated the area-dependent rate of sublimation of ZrF4 and obtained a value of approximately 1.87 g/m2/s at …
Zirconium – Wikipedia
Zirconium und Hafnium sind auf einfache chemische Art nicht zu trennen. Deshalb enthält auch dieses hochreine Zirconium noch immer Hafnium. Da es für viele Anwendungen in der Reaktor -Technik wichtig ist, dass das Zirconium kein Hafnium mehr enthält, spielen Trennverfahren für diese beiden Metalle eine wichtige Rolle.
Method for preparing ultra-pure zirconium and …
OSTI.GOV Patent: Method for preparing ultra-pure zirconium and hafnium tetrafluorides
The oxyfluorides of zirconium and hafnium | …
We have established the composition of the hydrolysis products of the trihydrates of zirconium and hafnium tetrafluorides; the initial materials and final products have been analyzed thermally. 2. In a number of cases the data of thermal analysis are satisfactorily explained by representing the formed oxyfluorides in the form of tetramers.
Reactions of zirconium, hafnium and cerium …
Chem. 2, 115 (1972-73). .L inorg, nucL Chem., 1975, Vol. 37, pp. 1316-1318. Pergamon Press. Printed in Great Britain Reactions of zirconium, hafnium and cerium tetrafluoride with hydrazine (Received 10 September 1974) Irq OUR previous work we had examined the reactions of thorium and uranium tetrafluorides with hydrazine[l-3].
Zirconium and Hafnium Tetrachlorides
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hafnium oxide zirconium - torencfan.nl
The production of hafnium-free zirconium is the main source for hafnium. Hafnium resists corrosion due to formation of a tough, impenetrable oxide film on its surface. Its elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid.
Method for preparing ultra-pure zirconium and …
Method for preparing ultra-pure zirconium and hafnium tetrafluorides Abstract. A method for preparing ultra-pure metal tetrafluorides in which 3d such as Fe impurities are separated from impure material by a combined vaporization-electrolytic separation procedure.
Hafnium – Wikipedia
In Zirconium-Mineralen wie unter anderem Zirkon und Allendeit ist jedoch oft Hafnium als Fremdbeimengung enthalten, wobei die Menge an Hafnium meist 2 % des Zirconiumgehaltes (1–5 Gewichtsprozent Hafnium) beträgt. Eines der wenigen Minerale, die mehr Hafnium als Zirconium enthalten, ist die Zirkon-Varietät Alvit [(Hf,Th,Zr)SiO 4].
US2762688A - Preparation of tetrahalides of …
US2762688A US319792A US31979252A US2762688A US 2762688 A US2762688 A US 2762688A US 319792 A US319792 A US 319792A US 31979252 A US31979252 A US 31979252A US 2762688 A US2762688 A US 2762688A Authority US United States Prior art keywords zirconium fluoride hafnium reaction metal Prior art date 1952-11-10 Legal status (The legal status is an assumption and is not a …
An electron diffraction study of the molecules of ...
Physical Chemistry Zirconium Inorganic Chemistry Electron Diffraction Diffraction Study These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Sublimation Kinetics of Zirconium Tetrafluoride
1-10-2014 · An important step of a new process being developed for the beneficiation of the mineral zircon (Zr (Hf)SiO4) to produce nuclear grade zirconium (Zr) metal, is the separation of the Zr from the hafnium (Hf). Zr ores typically contain between 1 and 3% Hf , whereas the use of Zr metal in the nuclear industry requires a Hf content <100 ppm, owing to its high neutron-capture cross section.