NaCl-KCl熔盐体系电解制备金属铈工艺研究

为优化熔盐电解还原制备金属铈的工艺条件，开展了NaCl-KCl熔盐体系中CeCl₃的电化学行为及电解工艺研究。结果表明，在830 ℃下，以钼棒为工作电极、石墨棒为对电极、阴极电位高于1.9 V(Ag/AgCl为参比电极，下同)时，Ce³⁺可快速电解，提高Ce3+浓度有利于反应的进行。槽电压为4.41 V、相应的阴极电位为2.27 V时，电流效率最佳。固定阳极面积改变阴极面积的研究结果显示，随着阴极面积的减小，槽电压逐渐升高。实验条件下，槽电压随电极中心距的变化是线性的，与电极中心距的改变相比，电流的变化对槽电压的影响更显著。

Electrolytic Extraction of Ce from NaCl-KCl Molten Salt

In order to optimize the technological conditions of cerium preparation by electrolytic reduction of molten salt, the electrochemical behavior of CeCl₃ in NaCl-KCl molten salt and the electrodeposition process on Mo electrode were carried out. The results indicate that Ce³⁺ can be quickly electrolyzed at the cathode potential more than 1.9 V (vs. Ag/AgCl) using Mo rod (ø4 mm). Increasing the concentration of Ce³⁺ is beneficial to the electrolytic reaction. The optimal electrolytic voltage is determined to be 4.41 V using two-electrode system, and the cathode potential is 2.27 V (vs. Ag/AgCl). It is found that the voltage increases with the decrease of cathode area when the anode area is fixed, and the cathode area is changed. Under the experimental conditions, the voltage varies linearly with the electrode center distance. Compared with the change of electrode center distance, the effect of current change on voltage is more significant.