Key Experimental Results of the PYROSMANI Project

Abstract The presented key results were obtained in the course of experiments carried out within the PYROSMANI (PYROchemical processes Study for Minor ActiNIdes recycling in molten salt chlorides and fluorides) Project supported by Rosatom. The individual and joint solubility of UF 4 , PuF 3 and CeF 3 in ternary LiF–NaF–KF and LiF- ThF 4 -UF 4 melts was measured by method of isothermal saturation for the temperature range 550-800°C. The solubility measurement technique based on isothermal saturation was verified in LiF–NaF–KF eutectics for praseodymium trifluoride by the reflectance spectroscopy. The process under investigation was the extraction of lanthanum, neodymium, europium and samarium trifluorides from 73LiF-27BeF 2 melt (mole %) into liquid bismuth at 600-610°C. There were defined temperature dependences of kinematic viscosity and melting temperatures for molten 46.5LiF–11.5NaF–42KF; 73LiF-27BeF 2 ; 85LiF-15AlF 3 and 43.5LiF–24.3NaF–32.2UF 4 salt mixtures from liquidus temperature to 840°C.