Uranium Mining

$31.00
US$/lb
25 August 2014

Chemical Properties of Uranium

Uranium like thorium belongs to the actinide series mainly represented by transuranic artificially received elements (plutonium, americium, curium etc.). However, by its chemical properties uranium has many features in common with molybdenum, tungsten and chrome. Its main chemical peculiarities are variable valency, amphoteric nature in quadrivalent state and propensity to forming a complex ion — uranyl (UO2)+2.

Most of the compounds of four-valent uranium are not soluble in water, however in oxidizing environment they decay and uranium transforms into hexavalent state. In neutral and acidic solutions hexavalent uranium mainly exists in the form of uranyl ion which forms salts well soluble in water. Fluoride of hexavalent uranium (hexafluoride) sublimes at 56ÓC and is used in the process of enrichment of natural uranium with U235 isotope.

Main Chemical Properties of Uranium
Uranium valency
2+, 3+, 4+, 5+, 6+
including in natural compounds
19.6 — 21, bhu 2
Ionic radius, nm
 
uranium 4+
1.408
uranium 5+
4.091
uranium 6+
0.98
Reaction with:
272 — 470
Water
22.5
Acids
27.66
Alkalies
10.7
atmospheric oxygen
29.0 x 10-4
metals
1.72 x 10-6

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