Development of the Diamex Process for Treating PHWR High-Level Liquid Waste

The extraction behavior of actinides like U(VI), Pu(IV), and Am(III) as well as of fission products like Tc(VII), Zr(IV), Eu(III), and structural material Fe(III) using nitric acid/simulated pressurized heavy water reactor-high-level waste solution as aqueous phase and N,N'-dimethyl-N,N' d...

Full description

Saved in:
Bibliographic Details
Published in:Nuclear technology 2002-09, Vol.139 (3), p.253-262
Main Authors: Kumbhare, L. B., Prabhu, D. R., Mahajan, G. R., Sriram, S., Manchanda, V. K., Badheka, L. P.
Format: Article
Language:English
Subjects:
ACETAMIDE
ACTINIDES
Applied sciences
Aromatic compounds
Cesium
CESIUM 137
Computer simulation
DIAMEX PROCESS
DODECANE
Energy
Exact sciences and technology
EXTRACTION
FISSION PRODUCTS
Fuels
HIGH-LEVEL RADIOACTIVE WASTES
LIQUID WASTES
MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
Nitric acid
Nuclear fuels
PHWR TYPE REACTORS
Pollution
Preparation and processing of nuclear fuels
RADIOACTIVE WASTE PROCESSING
Radioactive wastes
Radioisotopes
SOLUTIONS
SOLVENTS
Strontium
STRONTIUM 90
TECHNETIUM 99
Wastes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The extraction behavior of actinides like U(VI), Pu(IV), and Am(III) as well as of fission products like Tc(VII), Zr(IV), Eu(III), and structural material Fe(III) using nitric acid/simulated pressurized heavy water reactor-high-level waste solution as aqueous phase and N,N'-dimethyl-N,N' dibutyl tetra decyl malonamide (DMDBTDMA) in n-dodecane as solvent was investigated. The present work contributes significantly toward the development of nonphosphorous (environmentally friendly) extractant capable of partitioning long-lived actinides and fission products like 99 Tc from relatively short lived fission products like 90 Sr and 137 Cs as well as inactive components present in high-level waste. The D Am values determined in the temperature range between 15 and 45°C showed a gradual decrease with increase in temperature throughout the acidity range. The effect of N,N di-2-ethylhexyl acetamide (D2EHAA) as phase modifier on the physicochemical properties of DMDBTDMA/n-dodecane solvent was investigated and could be correlated with parameters like the limiting organic concentration value of HNO 3 , D Am , or phase disengagement time. Overall comparison of diamide extraction (Diamex) and transuranium extraction (Truex) solvents has been made.
ISSN:0029-5450
1943-7471
DOI:10.13182/NT02-A3317