Abstract
The sorption of neodymium and thorium fluorides by AG-3 activated carbon from molten alkali metal fluorides LiF–NaF–KF has been studied. The sorption isotherm of neodymium fluoride at 650°C has a pronounced convex and is adequately described by the Langmuir equation. The sorption of thorium fluoride under the same conditions is much weaker than that of neodymium fluoride, which is determined by the size of the neodymium and thorium fluoride complexes. The kinetic dependence of the sorption of neodymium fluoride at a temperature of 650°С is adequately described by a first-order equation for a reversible reaction. The temperature dependence of sorption capacity in the range 550–750°С passes a maximum within 600–650°С.
Highlights
Expanding the fuel base and reducing the volume of long-lived radionuclides from SNF reprocessing, a subject to geological disposal, are the promising directions for the stable development of nuclear energy
The sorption of activated carbons occurs via both physical interactions in the pores and chemical reactions
The kinetics of Nd(III) sorption was studied at its constant concentration in the eutectic, equal to 10.5 ± 0.23 mg/g, by activated carbon at a temperature of 650°C
Summary
Expanding the fuel base and reducing the volume of long-lived radionuclides from SNF reprocessing, a subject to geological disposal, are the promising directions for the stable development of nuclear energy. In this regard, non-water technologies based on processes in molten salts (eutectics) have prospects. Owing to the short irradiation time, the fraction of side reactions producing uranium-232 is sharply reduced, which, in principle, allows production of uranium-233 with a minimum content of uranium-232 This approach requires rapid recovery of protactinium-233. The best blanket is molten fluorides of some metals, and the LiF–ThF4 eutectic in particular
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