zirconium hafnium tetrafluorides

Zirconium Hafnium Tetrafluorides

Zirconium tetrafluoride - Wikipedia

Zirconium fluoride in a mixture with other fluorides is a coolant for molten salt reactors. In the mixture with sodium fluoride it is a candidate coolant for the Advanced High-Temperature Reactor. Together with uranium salt, zirconium fluoride can be a …

Zirconium - Wikipedia

Zirconium is a stone 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.

Method for preparing ultra-pure zirconium and hafnium ...

Mar 25, 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 use in fabrication of the various heavy-metal fluoride glasses.

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.

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 850–875°C. Product composition

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 presented and the

Zirconium and Hafnium Chemistry - ScienceDirect

There are several complete compilations of the literature concerning zirconium and hafnium that take the reader up to about 1960. Since then several reviews of more limited scope have been published, one on the structural aspects of zirconium chemistry, and others on the separation of zirconium and hafnium aqueous chemistry, and ion-exchange properties of zirconium …

Zirconium and hafnium

Zirconium and hafnium are corrosion-resistant metals that are widely used in the stone and nuclear industries. Most zirconium is consumed in the form of the main ore mineral zircon (ZrSiO4, or as zirconium oxide or other zirconium chemicals. Zirconium and hafnium are both refractory lithophile elements that have nearly identical charge, ionic radii, and ionic potentials.

US4865693A - Preparation of complexes of zirconium and ...

This is a zirconium-hafnium separation process utilizing a complex of zirconium-hafnium chlorides and phosphorus oxychloride. The complex is introduced into a distillation column and a hafnium chloride enriched stream is taken from the top of the column and a zirconium chloride enriched stream is taken from the bottom of the column. In particular, the invention utilizes …

(PDF) Separation of Zirconium and Hafnium: A Review

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 …

Sublimation Kinetics of Zirconium Tetrafluoride

Oct 01, 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 …

(PDF) Selective sublimation/desublimation separation of ...

and hafnium tetrafluorides. US patent 4578252 A. P ERRY, R.H. and G REEN, D.W. 1997. ... The separation of zirconium and hafnium is essential in the nuclear industry, since zirconium alloys for ...

The oxyfluorides of zirconium and hafnium | SpringerLink

1. We have established the composition of the hydrolysis products of the trihydrates of zirconium and hafnium tetrafluorides; the initial materials and …

Protective effect of different tetrafluorides on erosion ...

The aim was to analyze the protective effects of titanium, zirconium and hafnium tetrafluorides on erosion of pellicle-free and pellicle-covered enamel and dentine in vitro. Eight groups of 20 specimens each of bovine enamel and bovine dentine were prepared.

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.

The Chemistry of Titanium, Zirconium and Hafnium - 1st Edition

Oct 22, 2013 · The Chemistry of Titanium, Zirconium and Hafnium deals with the chemistry of titanium, zirconium, and hafnium and covers topics ranging from the occurrence and metallurgy of all three elements to their nuclear, physical, and stone properties as …

WebElements Periodic Table » Zirconium » compounds information

Hafnium; Hassium ☢ ... For each compound, a formal oxidation number for zirconium is given, but the usefulness of this number is limited for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.

Preparation of zirconium from zirconium tetrafluoride

Preparation of zirconium from zirconium tetrafluoride Abstract Increased interest in zirconium as a material of construction has resulted in numerous attempts to develop more economical processes for its production. Currently the Kroll Process, which reduces zirconium tetrachloride with magnesium, is used.

Zirconium hydride - Wikipedia

Zirconium is found in the Earths crust only in the form of an ore, usually a zirconium silicate, such as zircon.Zirconium is extracted from zirconium ore by removing the oxygen and silica. This process, known as the Kroll process, was first applied to titanium.The Kroll process results in an alloy containing hafnium.The hafnium and other impurities are removed in a subsequent step.

Last Article: Market Size Belts   Next Article: Jaw Crusher Pe 1200

Related articles:

2006-2020 © All rights reserved
Add: New Technical Industry Development Area, Zhengzhou, Henan, China. Postcode: 450001
E-mail: [email protected]