Sodium salt recycling process for use in wet reprocessing...

Details Sodium salt recycling process for use in wet reprocessing... Sodium salt recycling process for use in wet reprocessing...

2007-01-15

2010-02-23

Lorengo, Jerry (Department: 1793)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

C588S003000, C588S011000, C588S020000, C588S252000, C588S257000, C210S638000, C210S712000, C210S757000

Reexamination Certificate

active

07666370

ABSTRACT:
The present disclosure relates to a process for recycling a sodium salt by decomposition of a sodium nitride liquid waste, comprising a neutralization step in which a nitric acid liquid waste or an off-gas having nitric acid dissolved therein which is produced through a wet reprocessing process comprising a dissolution step for dissolving a spent nuclear fuel in nitric acid is neutralized by adding or contacting the nitrate liquid waste or the off-gas to or with at least one sodium salt selected from the group consisting of sodium hydroxide, sodium hydrogencarbonate and sodium carbonate, thereby yielding a sodium nitrate liquid waste; a sodium nitrate-decomposition step in which the sodium nitrate liquid waste is reductively decomposed with a reducing agent, thereby decomposing sodium nitrate into a nitrogen gas and the sodium salt; and a recycle step for recycling the sodium salt into the neutralization step or wet reprocessing process.

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RITE-Wakamatsu Second Laboratory, “Development of Wet Reductive Decomposition Processing Technique for Nitrate-Nitrogen in Wastewater”, Report on Completion of Program for Promotion of Technology Development from 2002 to 2004, I-26, Research Institute of Innovative Technology for the Earth, Mar. 2005 and its English abstract.

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