Zinc(II) oxide solubility and phase behavior in aqueous sodium phosphate solutions at elevated temperatures
A platinum-lined, flowing autoclave facility is used to investigate the solubility/phase behavior of zinc(II) oxide in aqueous sodium phosphate solutions at temperatures between 290 and 560 K. ZnO solubilities are observed to increase continuously with temperature and phosphate concentration. At higher phosphate concentrations, a solid phase transformation to NaZnPO{sub 4} is observed. NaZnPO{sub 4} solubilities are retrograde with temperature. The measured solubility behavior is examined via a Zn(II) ion hydrolysis/complexing model and thermodynamic functions for the hydrolysis/complexing reaction equilibria are obtained from a least-squares analysis of the data. The existence of two new zinc(II) ion complexes is reported for the first time: Zn(OH){sub 2}(HPO{sub 4}){sup 2{minus}} and Zn(OH){sub 3}(H{sub 2}PO{sub 4}){sup 2{minus}}. A summary of thermochemical properties for species in the systems ZnO-H{sub 2}O and ZnO-Na{sub 2}O-P{sub 2}O{sub 5}-H{sub 2}O is also provided. 21 refs., 10 figs., 7 tabs.
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, NY (USA)
- Sponsoring Organization:
- DOE/NE
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 6409978
- Report Number(s):
- KAPL-4716; ON: DE91004969
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
DISSOLUTION
HIGH TEMPERATURE
HYDROLYSIS
LYSIS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
PHASE STUDIES
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SOLUBILITY
SOLUTIONS
SOLVOLYSIS
STABILITY
THERMODYNAMIC PROPERTIES
ZINC COMPOUNDS
ZINC OXIDES
ZINC PHOSPHATES