Reprocessing method by fluoride volatility process using...

Details Reprocessing method by fluoride volatility process using... Reprocessing method by fluoride volatility process using...

2008-01-29

2008-01-29

Nguyen, Ngoc-Yen (Department: 1754)

Chemistry of inorganic compounds

Radioactive

Transuranium compound

C423S253000, C423S258000, C423S249000, C423S259000, C423S003000, C423S019000

Reexamination Certificate

active

07323153

ABSTRACT:
Fluorine or a fluorine compound is subjected to a reaction with a spent oxide fuel to produce fluorides of uranium and plutonium, and recovering the fluorides using a difference in volatility behavior. The method includes steps of: subjecting a mixture of UO2and PuO2with hydrogen fluoride mixed with hydrogen to HF-fluorinate uranium and plutonium into UF4and PuF3; subjecting UF4and PuF3with a fluorine gas to F2-fluorinate uranium and plutonium into UF6and PuF6; and fractionating UF6and PuF6using a difference in phase change of obtained UF6and PuF6, removing a part of UF6, and volatilizing the remaining UF6and PuF6at the same time. By such a reprocessing method, PuF4hard to undergo a reaction is prevented from being formed as an intermediate fluoride, the material of a reactor is hard to be corroded, and a consumption of expensive fluorine gas is reduced.

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