Thermal properties of phosphate glasses for salt waste immobilization

• Published in: Journal of thermal analysis and calorimetry Vol. 117; no. 1; pp. 197 - 204
• Main Authors: Stoch, Pawel, Ciecinska, Malgorzata, Stoch, Agata
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-07-2014; Springer
• Subjects: Analysis; Analytical Chemistry; Chemistry; Chemistry and Materials Science; Crystallization; Glass; Immobilization; Inorganic Chemistry; Iron; Measurement Science and Instrumentation; Phosphate glass; Phosphates; Physical Chemistry; Polymer Sciences; Radioactive wastes; Sodium; Thermal properties; Waste management; Wastes; Thermal properties; Thermal analysis; Iron phosphate glass; Vitrification; Nuclear waste
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-014-3698-2

Vitrification is the most effective method of the hazardous waste immobilization. Toxic elements are incorporated into glass structure. Iron phosphate glasses are presently being considered as a matrix for storage of the radioactive waste which cannot be vitrified using a conventional borosilicate glass. Influence of Na
2
SO
4
as one of the components such the waste on thermal properties and crystallization ability of iron phosphate waste glass was studied. It was observed that Na
2
SO
4
decreases transformation temperature and increases Δ
C
p
. The glass characteristic temperatures, glass crystallization ability, and crystallizing phases were determined. Na
2
SO
4
increases the glass crystallization ability which could be related with Δ
C
p
heat capacity accompanying glass transition changes. The glass internal structure rebuilding, accompanying the sodium content increase, is considered. It is shown that Δ
C
p
is a suitable, structure-sensitive glass crystallization ability, parameter.