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氯化锂熔盐中八氧化三铀电解还原基础研究

Electroreduction Fundamental Study of Solid U3O8 in Molten LiCl

    摘要
  • 摘要: 将氧化物乏燃料直接电解还原为粗金属的过程是目前以电解还原-电解精炼为特征的主流干法后处理流程的重要步骤。二氧化铀（UO2）是乏燃料的最主要成分，将致密的UO2芯块转化为八氧化三铀（U3O8）粉末后，再进行电化学还原能有效提高还原速率。因此，以U3O8为研究对象，开展其在氯化锂（LiCl）熔盐中的电解还原机理研究，对后处理干法流程的开发具有重要的现实意义。本文在650 ℃的LiCl熔盐中，采用循环伏安法和恒电位电解法，研究U3O8的电解还原行为；对电解后的样品，运用XRD、SEM等手段分析其组成和形貌，并推测相应的还原机理。

     

    Abstract: Direct reduction of spent oxide fuel to mix-metal is the key step of an important dry reprocessing process, which is feature with electroreduction-electrorefinning. UO2 is the main component in spent fuel. The transform of compact UO2 pellet to U3O8 powder could effectively improve the electroreduction rate. Therefore, taking U3O8 as research object, studying its electrochemical behaviors during the electroreduction process has certain practical significance for the development of this process. In this paper, the electroreduction behaviors of U3O8 in molten LiCl (650 ℃) were studied using cyclic voltammetry and constant potential electrolysis technology. The after electrolysis products were analyzed by XRD and SEM. Finally, a reduction mechanism was also proposed.

     

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