Immobilization of contaminated sodium: an optimization study
Source abstract
Abstract
Abstract Borosilicate glasses (BSG) are promising vitrification matrix for immobilization of contaminated sodium. Nine compositions of BSG were synthesized with O/Si ratio ranging from 3.7 to 4.8 by melt quench method. X-ray diffraction technique and scanning electron microscopy were used to ascertain the amorphous nature of glass and crystalline nature of heat treated glass. Linear thermal expansion of borosilicate glasses was determined by dilatometry. Based on maximum loading of Na2O, high density, minimum weight loss during synthesis, and volatilization studies, BSG with 45.1 SiO2 – 30.4 Na2O – 11.1 B2O3 -7.3 CaO - 6.2 ZnO (mol %) was chosen as the recommended composition and also demonstrated the immobilization of contamination of sodium with the addition of U3O8. Cold crystallization of pristine and contaminated sodium revealed the formation of Na4Ca4(Si6O18) phase during heat treatment at 1013 K in air atmosphere. Volatilization studies of above chosen composition under dynamic argon flow showed a maximum of 0.2 % weight loss, an advantage during the homogenization of the melt.
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Research context
OpenAlex topics: Glass properties and applications · Luminescence Properties of Advanced Materials · Nuclear materials and radiation effects
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