Uranium tetrafluoride

Uranium tetrafluoride

Chembox new
Name = Uranium tetrafluoride
ImageFile = UF4solid.jpg
IUPACName = Uranium(IV) fluoride
OtherNames = Uranium(IV) fluoride
Section1 = Chembox Identifiers
CASNo = 10049-14-6
RTECS =
Section2 = Chembox Properties
Formula = UF4
MolarMass = 314.0226 g/mol
Appearance = Green crystalline solid.
Density = 6.7 g/cm3, solid.
Solubility = Insoluable.
MeltingPt = 1036°C
BoilingPt = 1417°C (Subl.)
pKa =
Section7 = Chembox Hazards
EUClass = Irritant (I),
Very Toxic (T+)
RPhrases = R14, R15/29. R29
SPhrases = Not listed.
FlashPt = Non-flammable.
ExternalMSDS = [http://physchem.ox.ac.uk/MSDS/UR/uranium_tetrafluoride.html Safety (MSDS) data for uranium tetrafluoride]
Section8 = Chembox Related
OtherAnions = None.
OtherCpds = Uranium hexafluoride,
uranium oxide.

Uranium tetrafluoride (UF4) is a green crystalline solid compound of uranium with an insignificant vapor pressure and very slight solubility in water. Uranium in its tetravalent (uranous) state is very important in different technological processes. In the uranium refining industry it is known as green salt.

UF4 is generally an intermediate in the conversion of uranium hexafluoride (UF6) to either uranium oxides (U3O8 or UO2) or uranium metal. It is formed by the reaction of UF6 with hydrogen gas in a vertical tube-type reactor or by the action of hydrogen fluoride(HF) on uranium dioxide. UF4 is less stable than the uranium oxides and reacts slowly with moisture at ambient temperature, forming UO2 and HF, which are very corrosive; it is thus a less favorable form for long-term disposal. The bulk density of UF4 varies from about 2.0 g/cm3 to about 4.5 g/cm3 depending on the production process and the properties of the starting uranium compounds.

A molten salt reactor design, a type of nuclear reactor where the working fluid is a molten salt, would use UF4 as the core material. UF4 is generally chosen over other salts because of the usefulness of the elements without isotope separation, better neutron economy and moderating efficiency, lower vapor pressure and better chemical stability.

Like all uranium salts UF4 is toxic and thus harmful by inhalation, ingestion and through skin contact. Being radioactive it may also cause cancer, probably through exposure to the breakdown product radon gas and its daughters.

References

*cite journal | author= Booth H. S., Krasny-Ergen W.,Heath R. E.| title= Uranium Tetrafluoride | journal= Journal of the American Chemical Society | year= 1946| volume= 68| pages= 1969–1970| doi= 10.1021/ja01214a028
*cite journal | author= S. Kern, J. Hayward,S. Roberts, J. W. Richardson, F. J. Rotella, L. Soderholm, B. Cort, M. Tinkle, M. West, D. Hoisington, G. H. Lander| title= Temperature variation of the structural parameters in actinide tetrafluorides | journal= Journal of Chemical Physics | year= 1994| volume= 101| pages= 9333–9337| doi= 10.1063/1.467963

External links

* [http://web.ead.anl.gov/uranium/guide/ucompound/propertiesu/tetrafluoride.cfm Uranium Tetrafluoride, Appendix A of the PEIS (DOE/EIS-0269)]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • uranium tetrafluoride — urano(IV) fluoridas statusas T sritis chemija formulė UF₄ atitikmenys: angl. uranium tetrafluoride; uranium(IV) fluoride rus. уран четырехфтористый; урана тетрафторид; урана(IV) фторид ryšiai: sinonimas – urano tetrafluoridas …   Chemijos terminų aiškinamasis žodynas

  • uranium tetrafluoride — noun : a green crystalline nonvolatile compound UF4 that is usually made from uranium dioxide and hydrogen fluoride above 500°C or from uranium metal and fluorine and that is used in making uranium hexafluoride …   Useful english dictionary

  • Uranium trioxide — IUPAC name Uranium trioxide Uranium(VI) oxide …   Wikipedia

  • Uranium — (pronEng|jʊˈreɪniəm) is a silvery gray metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. It has 92 protons and 92 electrons, 6 of them valence electrons. It can have between 141 and …   Wikipedia

  • Uranium fluoride — can refer to:* Uranium trifluoride, UF3 * Uranium tetrafluoride, UF4 * Uranium pentafluoride, UF5 * Uranium hexafluoride, UF6 * Tetrauranium heptadecafluoride, U4F17 * Tetrauranium octadecafluoride, U4F18 …   Wikipedia

  • uranium processing — Introduction       preparation of the ore for use in various products.       Uranium (U), although very dense (19.1 grams per cubic centimetre), is a relatively weak, nonrefractory metal. Indeed, the metallic properties of uranium appear to be… …   Universalium

  • Uranium hexafluoride — Chembox new Name = Uranium hexafluoride ImageFile = Uranium hexafluoride 2D.png ImageSize = 125px IUPACName = Uranium hexafluoride Uranium(VI) fluoride Section1 = Chembox Identifiers CASNo = 7783 81 5 Density = 5.09 g/cm3, solid Solubility =… …   Wikipedia

  • uranium hexafluoride — noun : a pale yellow deliquescent crystalline compound UF6 that sublimes at 56.5°C, that is made usually from uranium tetrafluoride or uranium by direct action of fluorine, and that is used in the gaseous diffusion process for separation of… …   Useful english dictionary

  • uranium fluoride — noun : a fluoride of uranium: as a. : uranium tetrafluoride b. : uranium hexafluoride …   Useful english dictionary

  • uranium(IV) fluoride — urano(IV) fluoridas statusas T sritis chemija formulė UF₄ atitikmenys: angl. uranium tetrafluoride; uranium(IV) fluoride rus. уран четырехфтористый; урана тетрафторид; урана(IV) фторид ryšiai: sinonimas – urano tetrafluoridas …   Chemijos terminų aiškinamasis žodynas

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”