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Leaching Properties on Waste Form with Garnet Structure  

Chae Soo-Chun (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Jang Young-Nam (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Bae In-Kook (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Ryu Kyung-Won (Department of Earth and Environment Science, Chungbuk National University)
Ioudintseva T.S. (Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry)
Yudintsev S.V. (Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry)
Publication Information
Economic and Environmental Geology / v.39, no.2, 2006 , pp. 181-190 More about this Journal
Abstract
Garnet has been suggested as one of the most promising material for the immobilization of radionuclide in high level waste. But data on its chemical durability are sufficiently available. Accordingly, Gd and Ce garnets were synthesized as imitators for $Pu^{3+}\;and\;Pu^{4+}$ were synthesized, and their leaching rates, the parameters of the chemical durability were measured by changing the conditions. In distilled water, the ranges of leaching rates of Gd and Ce were $1.2{\times}10^{-4}{\sim}4.6{\times}10^{-6}g/m^2/day\;and\;7.5{\times}10^{-5}{\sim}1.8{\times}10^{-7}g/m^2/day$, respectively. A comparison with previous data suggests that the chemical durabilities of garnets synthesized from this study are superior to those of other waste forms. Additional leaching experiments were performed with 0.01M-HCl and 0.01M-NaOH solutions to see Gd and Ce leaching at acidic and alkalinity conditions. In 0.01 H-HCl solution, the ranges of leaching rates of Gd and Ce were $2.5{\times}10^{-1}{\sim}6.9{\times}10^{-3}g/m^2/day\;and\;3.7{\times}10^{-1}{\sim}3.1{\times}10^{-3}g/m^2/day$, respectively, while were $3.1{\times}10^{-4}{\sim}1.3{\times}10^{-6}g/m^2/day\;and\;1.8{\times}10^{-3}{\sim}0g/m^2/day$, respectively in 0.01M-NaOH solution. It is believed that leaching data can be used in understanding chemical durabilities of waste from garnets in acidic and alkaline conditions.
Keywords
garnet; leaching rate; waste form; immobilization; chemical durability;
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Times Cited By KSCI : 1  (Citation Analysis)
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