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Immobilization of 137 Cs in NaY type zeolite matrices using various heat treatment methods

Solid State Sciences, ISSN: 1293-2558, Vol: 154, Page: 107619
2024
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Article Description

The accumulation of liquid radioactive waste presents a significant global challenge, necessitating effective strategies for safe management. This study investigates the immobilization of 137 Cs radionuclides, a prominent component of liquid radioactive waste, in ceramic matrices based on 137 Cs-saturated NaY Faujasite zeolite. Various thermal methods were employed, including cold pressing and sintering, cold pressing and sintering with microwave assistance, hot pressing, and spark plasma sintering, to enhance immobilization capabilities. Zeolite powder was saturated with 137 Cs radionuclides using an adsorption technique with low-activity model liquid radioactive waste. In-situ XRD and dilatometry methods were used to study the thermal behavior during NaY Faujasite annealing. The influence of calcination temperature on lattice parameters and crystallite size was assessed. Immobilization effectiveness was evaluated through relative density, Vickers microhardness, compressive strength, and metal ion leaching kinetics. Mechanistic evaluation was performed using XRD and SEM-EDX studies. Results showed that spark plasma sintering exhibited the highest efficiency for immobilizing 137 Cs radionuclides in NaY Faujasite matrices. This research contributes to liquid radioactive waste management by providing insights into the thermal behavior and enhanced immobilization capabilities of ceramic matrices.

Bibliographic Details

O. O. Shichalin; E. K. Papynov; A. A. Belov; N. P. Ivanov; I. Yu Buravlev; A. O. Lembikov; M. I. Dvornik; P. G. Chigrin; N. M. Vlasova; Yu A. Mirovoy; N. D. Kulagin; E. S. Mirovaya; A. V. Syuy; T. A. Borisenko; A. V. Ukhina; V. O. Kaptakov; A. P. Zavjalov; Yun Shi; A. I. Ivanets

Elsevier BV

Chemistry; Materials Science; Physics and Astronomy

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