Thermodynamic and Physical Properties of Molten LiF-ThF4-UF4 Salts Mixture

Density Measurements of Molten Salts

“…Table shows density-temperature correlations of LiF–ThF 4 and LiF–ThF 4 –UF 4 salts from this study compared to those from Hill et al and Das et al , Densities of the LiF–ThF 4 salt from this study are plotted in Figure with the density-temperature correlation developed by Hill et al and the results from the formula of the ideal-mixture density (eq ). Standard uncertainties of the measured densities from this study are 0.010 g/cm 3 .…”

“…There have been many studies on the measurement of density for molten fluoride salts, as fluoride salts are considered as promising coolants and/or fuels for molten salt reactors. − The molten LiF–NaF–KF (46.5–11.5–42.0 mol %, known as FLiNaK) is one of fluoride salts whose density has been actively measured in different temperature ranges. ,− In addition, densities of other fluoride salts, such as LiF–ThF 4 and LiF–ThF 4 –UF 4 salts, have also been measured in previous studies. Hill et al measured the density of molten LiF–ThF 4 with different compositions, and Das et al studied the density of molten LiF–ThF 4 –UF 4 (77.50-19.95-2.55 mol %) …”

“…Different kinds of methods have been used to measure the density of molten salts, such as Archimedean method, − ,− modeling, , and neutron radiography . In addition, Zhang and Simpson developed a method to measure the density of molten chlorides by using a crucible calibration model, which is simpler than the Archimedean method .…”

“…The density-temperature correlation of FLiNaK from Chrenkova et al was used for the calibration of this system since the temperature range that this reference studied is similar to the temperature range that we are interested in. The calibration curves were then used to measure densities of LiF–ThF 4 (80.00–20.00 mol %) and LiF–ThF 4 –UF 4 (77.50–19.95–2.55 mol %) salts to validate the method, as densities of these salts have been measured in previous studies. , Densities of molten NaF–KF–UF 4 from 813 to 1173 K were also obtained by using the calibration curves. Then, these densities were compared to reported density-temperature correlations of molten NaF–KF–UF 4 salts which have similar compositions to the NaF–KF–UF 4 of this study.…”

Recovery of FLiBe from ThF4–FLiBe salt using precipitation–distillation coupled method

“…The lower the activity coefficient, the higher the affinity of the species to the solvent, and the more stable the species were in the solvent. Pratik Das 22 calculated the activity of ThF 4 over molten F 1+3 z Li 1- z Th x U y ( z = x + y , 1 ≤ x ≤ 0, 0 ≤ y ≤ 1) salts phase as a partial value from excess Gibbs energy of the molten salts mixture. They showed that the activity of ThF 4 remains constant up to x ThF 4 = 19.1 mol%, and afterwards it increased with a hump.…”