| 摘要 |
<p>A uranium-containing fuel is reprocessed by fluorination at 800-900 DEG C. with sulphur hexafluoride, with the formation of uranium hexafluoride. An oxidizing agent, for example oxygen, air, or pyrolusite, may also be present. The reaction may be carried out by a fluidized bed process or in a rotating tube furnace; the spent fuel may be mixed with corundum or fluorspar. Preliminary heating to 700-800 DEG C. volatilizes fission product fluorides and forms uranyl fluoride which is converted to uranium hexafluoride at the higher temperature. The fuel may be in metal, oxide or carbide form. If fuel particles coated with carbon or silicon carbide are treated, they should first be comminuted or treated at 900-1100 DEG C. with oxygen-containing gas in the presence of a combustion catalyst. The UF6 formed may be further decontaminated by passage through columns of sodium fluoride.</p> |
