影响CaCl_(2)-NaCl熔盐电脱氧法制备金属Zr的工艺条件  

Effects of Technological Conditions on Preparation of Metal Zr Using Electro-Deoxidation Method in CaCl_(2)-NaCl Molten Salt

作　　者：王有群 林如山[2] 何辉[2] 王欢[1] 刘云海 WANG You-qun;LIN Ru-shan;HE Hui;WANG Huan;LIU Yun-hai(School Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China;China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)

机构地区：[1]东华理工大学核科学与工程学院,江西南昌330013 [2]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2022年第1期83-89,共7页Journal of Nuclear and Radiochemistry

摘　　要：将氧化物转化为金属是熔盐电解精炼干法后处理氧化物乏燃料流程的关键步骤之一。在等摩尔CaCl_(2)-NaCl混合熔盐体系中,以石墨棒为阳极,采用高温烧结后的ZrO_(2)模拟UO_(2)开展了电脱氧制备金属Zr的FFC剑桥工艺条件优化。研究了工艺条件(槽电压、电解时间、烧结温度和电解温度等)对电脱氧制备Zr的影响。采用场发射扫描电子显微镜(SEM)和X射线衍射(XRD)分别分析了电解前后ZrO_(2)阴极的微观结构和物相组成。优化后的工艺条件为:电压3.4 V、电解时间12 h、烧结温度900℃和电解温度722℃。同时,研究结果表明,ZrO_(2)电脱氧还原为Zr时,存在中间产物CaZrO_(3)和ZrO。The conversion of oxides into metals is one of the key steps in the dry reprocessing of spent oxide fuel using the molten salt electrorefining method.In this study,in the CaCl_(2)-NaCl molten salt system,graphite rods were used as anodes,and the high-temperature sintered ZrO_(2) flakes were simulated UO_(2) cathode.Besides,the FFC Cambridge process conditions of electro-deoxidation to prepare metal zirconium in CaCl_(2)-NaCl molten salt were optimized.The effects of electrolysis process conditions(cell voltage,electrolysis time,sintering temperature,and electrolysis temperature,etc.)on the preparation of Zr by electro-deoxidation was studied systematically.SEM and XRD were utilized to analyze the microstructure and phase composition of the ZrO_(2) cathode before and after electrolysis,respectively.The optimized process conditions are voltage of 3.4 V,electrolysis time of 12 h,sintering temperature of 900℃,and electrolysis temperature of 722℃.At the same time,the intermediate products CaZrO_(3) and ZrO are found in the conversion of ZrO_(2) into Zr.

关 键 词：FFC剑桥工艺 ZrO_(2) 熔盐电脱氧 CaCl_(2)-NaCl熔盐 干法后处理 

分 类 号：TL241.1[核科学技术—核燃料循环与材料]