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Title: Dissolution studies with pilot plant and actual INTEC calcines

Abstract

The dissolution of Idaho Nuclear Technology and Engineering Center (INTEC) pilot plant calcines was examined to determine solubility of calcine matrix components in acidic media. Two representatives pilot plant calcine types were studied: Zirconia calcine and Zirconia/Sodium calcine. Dissolution of these calcines was evaluated using lower initial concentrations of nitric acid than used in previous tests to decrease the [H+] concentration in the final solutions. Lower [H+] concentrations contribute to more favorable TRUEX/SREX solvent extraction flowsheet performance. Dissolution and analytical results were also obtained for radioactive calcines produced using high sodium feeds blended with non-radioactive Al(NO{sub 3}){sub 3} solutions to dilute the sodium concentration and prevent bed agglomeration during the calcination process. Dissolution tests indicated {gt}95 wt.% of the initial calcine mass can be dissolved using the baseline dissolution procedure, with the exception that higher initial nitric acid concentrations are required. The higher initial acid concentration is required for stoichiometric dissolution of the oxides, primarily aluminum oxide. Statistically designed experiments using pilot plant calcine were performed to determine the effect of mixing rate on dissolution efficiency. Mixing rate was determined to provide minimal effects on wt.% dissolution. The acid/calcine ratio and temperature were the predominate variables affecting the wt.% dissolution,more » a result consistent with previous studies using other similar types of pilot plant calcines.« less

Authors:
;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Environmental Management (EM) (US)
OSTI Identifier:
752073
Report Number(s):
INEEL/EXT-99-00325
TRN: US0001108
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Apr 1999
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; ZIRCONIUM OXIDES; SODIUM OXIDES; DISSOLUTION; NITRIC ACID; TRUEX PROCESS; SOLVENT EXTRACTION; CALCINATION; ALUMINIUM OXIDES; SOLUBILITY; CALCINE; ACIDIC; ZIRCONIA; TRUEX/SREX; FLOWSHEET; SODIUM; ALUMINUM OXIDE; MIXING RATE; ACID/CALCINE RATIO; TEMPERATURE

Citation Formats

Herbst, R S, and Garn, T G. Dissolution studies with pilot plant and actual INTEC calcines. United States: N. p., 1999. Web. doi:10.2172/752073.
Herbst, R S, & Garn, T G. Dissolution studies with pilot plant and actual INTEC calcines. United States. https://doi.org/10.2172/752073
Herbst, R S, and Garn, T G. 1999. "Dissolution studies with pilot plant and actual INTEC calcines". United States. https://doi.org/10.2172/752073. https://www.osti.gov/servlets/purl/752073.
@article{osti_752073,
title = {Dissolution studies with pilot plant and actual INTEC calcines},
author = {Herbst, R S and Garn, T G},
abstractNote = {The dissolution of Idaho Nuclear Technology and Engineering Center (INTEC) pilot plant calcines was examined to determine solubility of calcine matrix components in acidic media. Two representatives pilot plant calcine types were studied: Zirconia calcine and Zirconia/Sodium calcine. Dissolution of these calcines was evaluated using lower initial concentrations of nitric acid than used in previous tests to decrease the [H+] concentration in the final solutions. Lower [H+] concentrations contribute to more favorable TRUEX/SREX solvent extraction flowsheet performance. Dissolution and analytical results were also obtained for radioactive calcines produced using high sodium feeds blended with non-radioactive Al(NO{sub 3}){sub 3} solutions to dilute the sodium concentration and prevent bed agglomeration during the calcination process. Dissolution tests indicated {gt}95 wt.% of the initial calcine mass can be dissolved using the baseline dissolution procedure, with the exception that higher initial nitric acid concentrations are required. The higher initial acid concentration is required for stoichiometric dissolution of the oxides, primarily aluminum oxide. Statistically designed experiments using pilot plant calcine were performed to determine the effect of mixing rate on dissolution efficiency. Mixing rate was determined to provide minimal effects on wt.% dissolution. The acid/calcine ratio and temperature were the predominate variables affecting the wt.% dissolution, a result consistent with previous studies using other similar types of pilot plant calcines.},
doi = {10.2172/752073},
url = {https://www.osti.gov/biblio/752073}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {4}
}