Recovery and separation of Fe and Mn from simulated chlorinated vanadium slag by molten salt electrolysis

Tailings from the vanadium extraction process are discarded each year as waste, which contain approximately 30wt% of Fe. In our previous work, we extracted Fe and Mn from vanadium slag, and Fe and Mn existed in the form of FeCl 2 and MnCl 2 after chlorination by NH 4 Cl to achieve effective and green usage of waste containing Fe and Mn. In this work, square wave voltammetry (SWV) and cyclic voltammetry (CV) were applied to investigate the electrochemical behaviors of Fe 2+ and Mn 2+ in NaCl-KCl melt at 800°C. The reduction processes of Fe 2+ and Mn 2+ were found to involve one step. The diffusion coefficients of FeCl 2 and MnCl 2 in molten salt of eutectic mixtures NaCl-KCl molten salt were measured. The electrodeposition of Fe and Mn were performed using two electrodes at a constant cell voltage. The Mn/Fe mass ratio of the electrodeposited product in NaCl-KCl-2.13wt%FeCl 2 -1.07wt%MnCl 2 was 0.0625 at 2.3 V. After the electrolysis of NaCl-KCl-2.13wt%FeCl 2 -1.07wt%MnCl 2 melted at 2.3 V, the electrolysis was again started under 3.0 V and the Mn/Fe mass ratio of the electrodeposited product was 36.4. This process provides a novel method to effectively separate Fe and Mn from simulated chlorinated vanadium slag.