Abstract The dissolution characteristics and electrochemical reduction mechanism of oxides of refractory metals ZrO2, HfO2 and MoO3 in NaCl-KCl-NaF melts are studied. The results shows that there are no chemical reaction of ZrO2 and HfO2 in NaCl-KCl-NaF melts, the dissolution of MoO3 is chemically dissolved, and MoO3 reactwith melts to form Na2Mo2O7. The reduction process of zirconium in the NaCl-KCl-NaF-ZrO2 melts is a reversible process of one-step electron transfer controlled by diffusion. The electrochemical reduction process of ruthenium is a one-step reversible process and the product is insoluble; Electrochemical reduction of metallic molybdenum in melts is controlled by the diffusion and electron transfer process of active ion Mo2O27 − . The electrochemical reduction process of the metal molybdenum in the melts is carried out in two steps.

中文翻译：

---

几种难熔金属氧化物在 FClNaKmelts 中的电化学还原机理

摘要 研究了难熔金属ZrO2、HfO2和MoO3的氧化物在NaCl-KCl-NaF熔体中的溶解特性和电化学还原机理。结果表明，在NaCl-KCl-NaF熔体中ZrO2和HfO2没有发生化学反应，MoO3的溶解是化学溶解，MoO3与熔体反应生成Na2Mo2O7。NaCl-KCl-NaF-ZrO2 熔体中锆的还原过程是一个由扩散控制的一步电子转移的可逆过程。钌的电化学还原过程为一步可逆过程，产物不溶；熔体中金属钼的电化学还原受活性离子 Mo2O27 - 的扩散和电子转移过程控制。熔体中金属钼的电化学还原过程分两步进行。