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URANIUM(IV) OXIDE

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URANIUM(IV) OXIDE Basic information

Product Name:
URANIUM(IV) OXIDE
CAS:
1344-57-6
MF:
O2U
MW:
270.02771
EINECS:
215-700-3
Mol File:
1344-57-6.mol
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URANIUM(IV) OXIDE Chemical Properties

Melting point:
2500°C
Density 
10,96 g/cm3
form 
brown cubic crystals
Water Solubility 
insoluble H2O, dilute acids; soluble conc acids [MER06]
EPA Substance Registry System
Uranium oxide (UO2) (1344-57-6)
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Safety Information

RIDADR 
2912
HazardClass 
7
PackingGroup 
III
HS Code 
28441000
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URANIUM(IV) OXIDE Usage And Synthesis

Chemical Properties

URANIUM(IV) OXIDE is black crystals. Insoluble inwater; soluble in nitric acid and concentrated sulfuric acid.

Physical properties

Brown to black powder or cubic crystals; density 10.97 g/cm3; Mohs hardness 5.5; melts at 2,827°C; insoluble in water and dilute acids; soluble in concentrated acids.

Uses

URANIUM(IV) OXIDE is a crystalline (or pellet) form is used to pack nuclear fuel rods.

Preparation

Uranium dioxide occurs in mineral uraninite. Purified oxide may be obtained from uraninite after purification. The commercial material, however, also is recovered from other uranium sources. Uranium dioxide is obtained as an intermediate during production of uranium metal (See Uranium). Uranyl nitrate, UO2(NO3)2, obtained from digesting the mineral uraninite or pitchblende with concentrated nitric acid and separated by solvent extraction, is reduced with hydrogen at high temperatures to yield the dioxide.

Hazard

High radiation risk. Ignites spontaneously in finely divided form.

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