Methods and devices using liquid metal including Bi or Pb or Bi-Pb alloy for separating actinides an

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The present invention relates to a method and a device to purify a whole high level radioactive waste into a middle level radioactive waste or a low level radioactive waste by separating an actinide element group and a rare earth element group from a molten salt generated from a used nuclear fuel pyrochemical process by using a liquid metal including bismuth (Bi) or bismuth-lead (Bi-Pb) alloy at high temperatures to lower the radiation level and thermal density of a final radioactive waste generated from a pyrochemical process. According to the present invention, the actinide element group and the rare earth element group included in the molten salt are reduced and melted to the inside of the liquid metal including Bi or Bi-Pb by electrolytic refining to form a heterogeneous metal compound of a liquid type or a solid type in the liquid metal including Bi or Bi-Pb alloy, and an equilibrium potential among elements in the same element group comes close, thereby making it difficult to separate each element. However, since the density of the heterogeneous metal compound is higher or lower than that of the liquid metal including Bi or Bi-Pb alloy, the heterogeneous metal compound of the two element groups is able to be separated by using a difference in the density. For this separation, configured is a device having a purifier, an agitator, a centrifuge, a magnetic field generator, a pipe, and a valve therein. Moreover, the liquid metal itself including Bi or Bi-Pb alloy remaining after collecting the heterogeneous metal compound is purified after separation, and the purified liquid metal is able to be reused in an electrolytic deposition.(AA) Liquid metal(BB) Molten salt-electrolytic refining device of the liquid metal(CC) Generation of a heterogeneous metal compound in the liquid metal(DD) Heterogeneous metal compound separation device(EE) Liquid metal-rare earth element group heterogeneous metal compound(FF) Vitrification device(GG) Disposal of vitrification radioactive waste(HH) Liquid metal-molten salt in which actinide element group heterogeneous metal compound is melted(II) Liquid metal-actinide element group heterogeneous metal compound molten salt melting device(JJ) Liquid metal-actinide element group heterogeneous metal compoundCOPYRIGHT KIPO 2017