NDLI: Zirconium Dioxide Solubility in High Temperature Aqueous Solutions

Content Provider	Springer Nature Link
Author	Qiu, Liyan Guzonas, Dave A. Webb, Don G.
Copyright Year	2009
Abstract	The heat transport purification system of CANDU nuclear reactors is used to remove particulates and dissolved impurities from the heat transport coolant. Zirconium dioxide shows some potential as a high-temperature ion-exchange medium for cationic and anionic impurities found in the CANDU heat transport system (HTS). Zirconium in the reactor core can be neutron activated, and potentially can be dissolved and transported to out-of-core locations in the HTS. However, the solubility of zirconium dioxide in high-temperature aqueous solutions has rarely been reported. This paper reports the solubility of zirconium dioxide in 10$^{−4}$ mol⋅kg$^{−1}$ LiOH solution, determined between 298 and 573 K, using a static autoclave. Over this temperature range, the measured solubility of zirconium dioxide is between 0.9 and 12×10$^{−8}$ mol⋅kg$^{−1}$, with a minimum solubility around 523 K. This low solubility suggests that its use as a high-temperature ion-exchanger would not introduce significant concentrations of contaminants into the system. A thermodynamic analysis of the solubility data suggests that Zr(OH) 4 0 likely is the dominant species over a wide pH region at elevated temperatures. The calculated Gibbs energies of formation of Zr(OH) 4 0 (aq) and Zr(OH)$_{4}$(am) at 298.15 K are −1472.6 kJ⋅mol$^{−1}$ and −1514.2 kJ⋅mol$^{−1}$, respectively. The enthalpy of formation of Zr(OH) 4 0 has a value of −1695±11 kJ⋅mol$^{−1}$ at 298.15 K.
Starting Page	857
Ending Page	867
Page Count	11
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	38
Issue Number	7
e-ISSN	15728927
Language	English
Publisher	Springer US
Publisher Date	2009-05-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ZrO$_{2}$ Solubility High temperature Thermodynamics Alkaline solution Condensed Matter Inorganic Chemistry Oceanography Geochemistry Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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