<p>Electrochemical reduction of U(III) ions on a liquid reactive Al electrode in molten 0.34 NaCl–0.66 CsCl eutectic was investigated using cyclic voltammetry, open-circuit potentiometry and galvanostatic electrolysis. These data are interest for the application of molten salt electrolysis in pyrochemical reprocessing of spent nuclear fuel. Electrode reaction of uranium deposition was proceeded in one step with a significant depolarization with formation of UAl₃ and UAl₄ intermetallic compounds. Conditions for electrochemical alloy production were determined. The activity, solubility of uranium in liquid aluminum, and basic thermodynamic properties of uranium compounds in molten salt media were calculated.</p> Graphical abstract <p></p>