To make it possible to separate fuel substances from other nuclear fission products without dissolving the substances as they remain oxides.
This method includes (1) a pulverization process for pulverizing fuel elements by heating and oxidizing spent fuel, (2) a selective sulfurization process for reducing the fuel substances and selectively sulfurizing nuclear fission products into sulfide or oxysulfide by heating the pulverulent bodies obtained in the pulverization process in an atmosphere containing a sulfurizer and (3) a magnetic separation process for collecting compounds of fuel elements and those of some nuclear fission product elements by suspending the compounds of the fuel elements and the nuclear fission product elements obtained in the previous process in a fluid and passing them through a magnetic separator and additionally separating them on the basis of the difference in their magnetic susceptibilities.
COPYRIGHT: (C)2005,JPO&NCIPI
Sato Osamu
Kenji Ohara
Sato Osamu
National Institute for Materials Science
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