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P. Govindan Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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A. Palamalai Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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K. Vijayan Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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S. Subbuthai Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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S. Murugesan Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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S. Mohan Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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R. Subba Rao Indira Gandhi Centre for Atomic Research Reprocessing Plant Operations Division, Reprocessing Group Kalpakkam 603 102 India

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Abstract  

Ammonium uranyl carbonate (AUC) precipitation is developed for the conversion of uranyl nitrate to oxide in the uranium reconversion step of reprocessing of irradiated fuel by the addition of ammonium carbonate salt. Different precipitation conditions of AUC are studied. The solubility of AUC as a function of uranium concentration in the feed at different temperatures using ammonium carbonate salt as precipitant is studied. This study indicates that 95-99.8% of uranium is recovered as AUC by precipitating 5-125 g/l of uranium with loss of uranium (250-10 ppm) in the filtrate by adding ammonium carbonate salt. It is also observed that the solubility of AUC increased as the concentration of uranium decreased. Thermal decomposition is carried out by thermogravimetry/differential thermal analysis (TG/DTA) and evolved gas analysis-mass spectrometry (EGA-MS) to find out AUC decomposition and gases evolved during decomposition. Studies are also carried out to characterize AUC by using X-ray diffraction (XRD). The data show that AUC obtained by the above conditions is very much consistent with published information.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)