Vacuum distillation of a mixture of LiCl-KCl eutectic salts and RE oxidative precipitates and a dechlorination and oxidation of RE oxychlorides.
Vacuum distillation of a mixture of LiCl-KCl eutectic salts and RE oxidative precipitates and a dechlorination and oxidation of RE oxychlorides.
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DOI：
10.1016/j.jhazmat.2008.03.079
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发表时间：
2008-12
影响因子：
13.6
通讯作者：
H. Eun;H. Yang;Y. Cho;Hansoo Lee;Intae Kim
中科院分区：
文献类型：
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作者：
H. Eun;H. Yang;Y. Cho;Hansoo Lee;Intae Kim
在本研究中，对 LiCl-KCl 共晶盐和稀土氧化沉淀物的混合物进行真空蒸馏，以从混合物中分离出纯 LiCl-KCl 共晶盐。此外，还对稀土氯氧化物进行脱氯和氧化，以稳定最终的废物形式。将混合物在710-759.5Torr的减压范围内以4℃/min的固定加热速率进行蒸馏，并且LiCl-KCl低共熔盐从混合物中完全分离。盐蒸馏所需的时间和盐蒸发的起始温度随着压力的降低而降低。稀土氯氧化物的脱氯和氧化在低于 1300°C 的温度下完成，这取决于 O2 分压。在脱氯和氧化过程中，稀土氯氧化物（NdOCl/PrOCl）转化为氧化物（Nd2O3/PrO2）。这些结果将用于设计回收电解精炼过程中的废盐的工艺概念。
In this study, a vacuum distillation of a mixture of LiCl–KCl eutectic salt and rare-earth oxidative precipitates was performed to separate a pure LiCl–KCl eutectic salt from the mixture. Also, a dechlorination and oxidation of the rare-earth oxychlorides was carried out to stabilize a final waste form. The mixture was distilled under a range of 710–759.5Torr of a reduced pressure at a fixed heating rate of 4°C/min and the LiCl–KCl eutectic salt was completely separated from the mixture. The required time for the salt distillation and the starting temperature for the salt vaporization were lowered with a reduction in the pressure. Dechlorination and oxidation of the rare-earth oxychlorides was completed at a temperature below 1300°C and this was dependent on the partial pressure of O2. The rare-earth oxychlorides (NdOCl/PrOCl) were transformed to oxides (Nd2O3/PrO2) during the dechlorination and oxidation process. These results will be utilized to design a concept for a process for recycling the waste salt from an electrorefining process.