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Received November 30, 2024
Accepted February 12, 2025
Available online August 25, 2025
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Geopolymer-Based Solidifi cation and Stabilization of CaO-Induced Concentrated Borate Waste Arising from Nuclear Power Plant Operation
Korea Atomic Energy Research Institute , 111 Daedeok-daero 989Beon-gil, Yuseong-gu , Daejeon 34057 , Republic of Korea
Korean Journal of Chemical Engineering, June 2025, 42(6), 1237-2347(1111)
https://doi.org/10.1007/s11814-025-00424-1
https://doi.org/10.1007/s11814-025-00424-1
Abstract
This study examined geopolymer-based solidifi cation and stabilization of sodium borate waste generated from nuclear power
plants. As the sodium borate is highly soluble in water, the dehydration and dissolution characteristics were preliminarily
investigated. The wasteform containing sodium borate anhydrous (SBA) itself was shown to exhibit a poor compressive
strength after thermal circulation and immersion tests, which was below the strength criterion of 3.44 MPa. Upon the introduction
of CaO to SBA solution to improve the dissolution properties of the borate waste, the synthesized compounds were
found mainly composed of calcium borate hydrate (Ca 2 B 2 O 5
