Owing to its capability of high-temperature operation, a salt waste treatment process in a pyrochemical process which uses molten salt as an electrolyte for the recycling of spent nuclear fuel adopted melt-crystallization method to purify a molten salt waste generated during the processes. However, because of its high operating temperature, there is a corrosion problem in the crystallizer made of Inconel 625 alloy, resulting in the contamination of crystallized salt on the crystallization plates. To solve the corrosion problem stemming from the molten salt waste under high operation temperature, a reactive-crystallization method was suggested in this study, in which the corrosion products are precipitated by the addition of lithium carbonate as a precipitation agent. To determine the effectiveness of the process, the concentration of corrosion products were analyzed for each stage of the process with respect to the values obtained using the previous melt-crystallization method. In addition, the nuclide separation efficiencies of group I/II and rare-earth nuclides were investigated using the reactive-crystallization method. Through the study, it is found that the reactive-crystallization method is effective in terms of removal of corrosion products, thus resulting in high nuclide separation efficiency.

中文翻译：

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一种净化氯化锂盐废料的反应结晶法

由于其具有高温操作能力，以熔盐为电解液回收乏核燃料的高温化学过程中的盐废物处理过程采用熔融结晶法来净化过程中产生的熔盐废物。但因工作温度高，Inconel 625合金结晶器存在腐蚀问题，导致结晶盐污染结晶板上。为了解决熔盐废料在高温下产生的腐蚀问题，本研究提出了一种反应结晶法，通过添加碳酸锂作为沉淀剂来沉淀腐蚀产物。为了确定过程的有效性，相对于使用先前熔融结晶方法获得的值，对过程的每个阶段的腐蚀产物浓度进行了分析。此外，使用反应结晶方法研究了 I/II 族和稀土核素的核素分离效率。通过研究发现，反应结晶法在去除腐蚀产物方面是有效的，因此核素分离效率高。