Uranium Tetrachloride



{| class="toccolours" border="1" style="float: right; clear: right; margin: 0 0 1em 1em; border-collapse: collapse;"! | Uranium tetrachloride |-| align="center" colspan="2" bgcolor="#ffffff" | |-| IUPAC nomenclature| Tetrachlorouranium|-| Other names| Uranium (IV) Chloride|-| Molecular formula| 379.84 g/mol|-| [CAS number| 4720 kg/m3|-| [Solubility (Water (molecule))| -------|-| Melting point| 791°C|-| [Crystal structure|-|}Uranium tetrachloride (UCl4) is a dark green compound of [uranium. Uranium metal was first isolated (1841) by Eugène-Melchior Péligot by the reduction of uranium tetrachloride with potassium. Commercially uranium tetrachloride is produced by the reaction of carbon tetrachloride with pure uranium dioxide UO2 at 370°C. It is radioactive and is soluble in water.

Uranium tetrachloride is used as feed in the electromagnetic isotope separation (EMIS) process of uranium enrichment. Beginning in 1944, the Y-12 National Security Complex converted UO3 to UCl4 feed for the for Ernest O. Lawrence’s calutron. Its major benefit being the uranium tetrachloride used in the calutrons is not as corrosive as the uranium hexafluoride used in most other enrichment technologies This process was abandoned in the 1950s. In the 1980s, however, Iraq unexpectedly revived this option as part of its nuclear weapons program. In the enrichment process, uranium tetrachloride is ionized into a uranium plasma (physics).The uranium ions are then accelerated and passed through a strong magnetic field. After traveling along half of a circle the beam is split into a region nearer the outside wall which is depleted and a region nearer the inside wall which is enriched in U-235. The large amounts of energy required in maintaining the strong magnetic fields as well as the low recovery rates of the uranium feed material and slower more inconvenient facility operation make this an unlikely choice for large scale enrichment plants.

Work is being done in the use of molten uranium chloride-alkali chloride mixtures as reactor fuels in molten salt reactors. Uranium tetrachloride melts dissolved in a lithium chloride-potassium chloride eutectic have also be explored as a means to recover actinides from irradiated nuclear fuels through pyrochemical nuclear reprocessing.

References

DOI

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