Study of electrochemical separation in molten fluoride salt media

The paper presents results obtained by Linear Sweep Cyclic Voltammetry Method and by electrolytic experiments that were realized in three eutectic fluoride melts LiF-NaF-KF, LiF-CaF₂ and LiF-BeF₂. Electrochemical properties and separation of selected actinides (U, Th), lanthanides (Nd, Gd, Eu, etc.) and other related elements (Zr, Sr) were studied for application in the Molten Salt Reactors (MSR) fuel concept. Experimental conditions and set-up including electrochemical cell, working under argon atmosphere, placed in the resistance oven inside a nitrogen glove-box and originally designed reference electrode with lanthanum trifluoride single crystal applicable for electrochemistry in molten fluorides are described. Comparison of measured cyclic voltammetry results is presented and separation possibilities of studied components in particular melts are estimated. Results of electro-separation experiments are also discussed. (authors)