| Revision as of 07:59, 13 October 2011 editBeetstra (talk | contribs)Edit filter managers, Administrators172,071 edits oops← Previous edit |
Latest revision as of 15:48, 11 October 2024 edit undoShinkolobwe (talk | contribs)Extended confirmed users, Pending changes reviewers18,772 edits Cleanup of the source code of the page |
| (42 intermediate revisions by 28 users not shown) |
| Line 1: |
Line 1: |
|
|
{{Short description|Mixed oxide of uranium and sodium}} |
|
{{unreferenced|date=February 2011}} |
|
|
{{Chembox |
|
{{Chembox |
|
|
| Verifiedfields = changed |
|
| ImageFile = |
|
|
|
| Watchedfields = changed |
|
| ImageSize = |
|
|
|
| verifiedrevid = 455337250 |
|
| ImageAlt = |
|
|
|
| ImageFile1 = Sodium_Diuranate.jpeg |
|
|
| ImageFile2 = Na2U2O7.png |
|
|
| ImageSize2 = |
|
|
| ImageAlt2 = |
|
| IUPACName = |
|
| IUPACName = |
|
| OtherNames = |
|
| OtherNames = |
|
| Section1 = {{Chembox Identifiers |
|
|Section1={{Chembox Identifiers |
|
|
| CASNo_Ref = {{cascite|correct|CAS}} |
|
| CASNo = |
|
| CASNo = 13721-34-1 |
| ⚫ |
| PubChem = |
|
|
|
| UNII_Ref = {{fdacite|correct|FDA}} |
|
| SMILES = }} |
|
|
|
| UNII = 563BIJ19PP |
| ⚫ |
| Section2 = {{Chembox Properties |
|
|
⚫ |
| PubChem = 160982 |
| ⚫ |
| Formula = Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub>·6H<sub>2</sub>O |
|
|
| MolarMass = |
|
| SMILES = }} |
|
⚫ |
|Section2={{Chembox Properties |
|
| Appearance = |
|
|
⚫ |
| Formula = Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub> |
|
| Density = |
|
|
| MeltingPt = |
|
| MolarMass = |
|
| BoilingPt = |
|
| Appearance = |
|
|
| Density = 6.44 g/cm<sup>3</sup> |
|
| Solubility = }} |
|
|
|
| MeltingPtC = 1646 |
| ⚫ |
| Section3 = {{Chembox Hazards |
|
|
| MainHazards = |
|
| BoilingPt = |
|
| FlashPt = |
|
| Solubility = }} |
|
⚫ |
|Section3={{Chembox Hazards |
|
| Autoignition = }} |
|
|
|
| MainHazards = |
|
|
| FlashPt = |
|
|
| AutoignitionPt = }} |
|
}} |
|
}} |
|
|
'''Sodium diuranate''', also known as the yellow oxide of uranium, is an ] with the ] {{chem2|Na2U2O7}}. It is a ] ] of a ] anion. It forms a hexahydrate {{chem2|Na2U2O7*6H2O}}. Sodium diuranate is commonly referred to by the initials SDU.<ref>Meredith, A. D. (2013). Modified Sodium Diuranate Process for the Recovery of Uranium from Uranium Hexafluoride Transport Cylinder Wash Solution. (Doctoral dissertation). Retrieved from http://scholarcommons.sc.edu/etd/2466</ref> Along with ] it was a component in early ]s.<ref name="Kent2010">{{cite book|last1=Kent|first1=James A.|title=Kent and Riegel's Handbook of Industrial Chemistry and Biotechnology|url=https://books.google.com/books?id=AYjFoLCNHYUC&pg=PA962|date=27 May 2010|publisher=Springer Science & Business Media|isbn=978-0-387-27843-8|pages=962–}}</ref> The ratio of the two compounds is determined by process conditions; however, yellowcake is now largely a mix of ]s.<ref name="Hausen1998">{{cite journal|last1=Hausen|first1=D. M.|title=Characterizing and classifying uranium yellow cakes: A background|journal=JOM|volume=50|issue=12|year=1998|pages=45–47|issn=1047-4838|doi=10.1007/s11837-998-0307-5|bibcode=1998JOM....50l..45H|s2cid=97023067}}</ref> |
|
'''Sodium diuranate''', Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub>·6H<sub>2</sub>O, is a ] ] also known as the yellow oxide of uranium. Along with ] it was a component in early ]s, the ratio of the two species determined by process conditions; yellowcake is now largely a mix of ]s. It is commonly referred to by the initials SDU. |
|
|
|
|
|
|
|
== Preparation == |
|
In the classical procedure for extracting uranium, ] is broken up and mixed with ] and ]s. The uranium dissolves to form ], and ] is added to make the uranium ] as sodium diuranate. This older method of extracting uranium from its ] has been replaced in current practice by such procedures as ], ], and ] methods. |
|
|
|
In the classical procedure for extracting uranium, ] is broken up and mixed with ] and ]s.<ref>{{cite web |url=http://www.mqes-uranium.com/metallurgy.html |title=MQes Uranium Inc. |language=en |access-date=2016-06-01 }}</ref> The uranium dissolves to form ] and sodium carbonate is added to precipitate impurities. If the uranium in the ore is in the tetravalent ], an oxidiser is added to oxidise it to the hexavalent oxidation state, and ] is then added to make the uranium ] as sodium diuranate.<ref>. Retrieved 2020-04-30</ref> |
|
|
The ] process of milling uranium ores involves precipitating sodium uranate from the pregnant ] solution to produce the semi-refined product referred to as ].<ref>. Retrieved 2020-04-30</ref> |
|
|
|
|
|
|
These older methods of extracting uranium from its ] has been replaced in current practice by such procedures as ], ], and ] methods.<ref>Gindler, J. E. (1962). p. 39–235</ref> |
|
In the past it was widely used to produce ], the ] salt dissolving easily into the ] matrix during the firing of the initial melt. |
|
|
|
|
|
|
Sodium uranate may be obtained in the amorphous form by heating together urano-uranic oxide and ]; or by heating sodium uranyl acetate or ]. The crystalline form is produced by adding the green oxide in small quantities to fused sodium chloride, or by dissolving the amorphous form in fused sodium chloride, and allowing crystallization to take place. It yields reddish-yellow to greenish-yellow prisms or leaflets. |
|
|
|
|
|
== Uses == |
|
|
] bowl in the shape of a cat, on top of a ] plate, both previous uses of sodium diuranate.]] |
|
|
In the past it was widely used to produce ] or vaseline glass,<ref>{{cite journal|url=https://pubs.rsna.org/doi/pdf/10.1148/radiographics.13.3.8316677|doi = 10.1148/radiographics.13.3.8316677|title = A brief history of radioactive glassware|year = 1993|last1 = Landa|first1 = E. R.|last2 = Disantis|first2 = D. J.|journal = Radiographics|volume = 13|issue = 3|pages = 697–699|pmid = 8316677}}</ref> the ] salt dissolving easily into the ] matrix during the firing of the initial melt. |
|
|
|
|
|
It was also used in ] ] to give them a ] similar to that of natural ] and once used in ] to produce ivory to yellow shades in ]s.<ref>{{cite web |url=https://www.orau.org/ptp/collection/consumer%20products/dentures.htm |title=Uranium Containing Dentures (ca. 1960s, 1970s) |language=en |access-date=2016-06-01 }}</ref> It was added to these products as a mix with ].<ref>{{cite journal |last1=Shcherbakov |first1=Alexander B. |last2=Reukov |first2=Vladimir V. |last3=Yakimansky |first3=Alexander V. |last4=Krasnopeeva |first4=Elena L. |last5=Ivanova |first5=Olga S. |last6=Popov |first6=Anton L. |last7=Ivanov |first7=Vladimir K. |title=CeO<sub>2</sub> Nanoparticle-Containing Polymers for Biomedical Applications: A Review |journal=Polymers |date=17 March 2021 |volume=13 |issue=6 |pages=924 |doi=10.3390/polym13060924 |pmid=33802821 |pmc=8002506 |issn=2073-4360|doi-access=free }}</ref> The final uranium composition was from 0.008 to 0.1% by weight uranium with an average of about 0.02%. The practice appears to have stopped in the late 1980s. |
|
|
|
|
|
==References== |
|
==References== |
|
{{reflist}} |
|
{{Reflist}} |
|
|
|
|
|
|
==External links== |
|
* |
|
|
|
* |
|
* |
|
|
* |
|
* |
|
|
* {{Webarchive|url=https://web.archive.org/web/20210302225749/http://ibilabs.com/msds/new-uranyl-compounds-msds/sodium-uranate-msds/ |date=2021-03-02 }} |
|
|
* {{cite journal | doi = 10.1016/0022-5088(86)90198-0 | title = Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub>: Synthèse et structure d'un monocristal | year = 1986 | last1 = Gasperin | first1 = M. | journal = Journal of the Less Common Metals | volume = 119 | pages = 83–90}} |
|
|
|
|
|
{{Sodium compounds}} |
|
{{Sodium compounds}} |
| Line 43: |
Line 62: |
|
] |
|
] |
|
] |
|
] |
|
|
|
|
{{Inorganic-compound-stub}} |
|
|
|
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|