ELECTROCHEMISTRY FOR Nd ELECTROWINNING FROM FLUORIDE-OXH)E MOLTEN SALTS

摘要

In this paper, cyclic voltammetry and chronoamperometry have been applied to investigate the effects of Nd_2O_3 concentration on the anode effects, critical potential for the anode effects and Nd_2O_3 reduction in LiF-NdF_3-Nd_2O_3 melts at 950°C . The results show that the oxidation peaks in the potential of about 2.7V are attributed to the oxygen ions oxidation and the peak current density increases with Nd_2O_3 concentration increase from 0 to 0.5wt%. The critical potential caused the anode effects shifts to 0.3V more positive value as Nd_2O_3 content in the melts decreases from 0.01wt% to 0.5wt%. The cyclic votammograms on W electrodes in the LiF-NdF_3-Nd_2O_3 melts present two pairs of reduction and oxidation peaks, indicating that the reduction of Nd ions in the LiF-NdF_3-Nd_2O_3 melts in two steps rather than one step.