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首页> 外文期刊>Journal of nuclear science and technology >Characteristics of Oxidation Reaction of Rare-earth Chlorides for Precipitation in LiCl-KCl Molten Salt by Oxygen Sparging
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Characteristics of Oxidation Reaction of Rare-earth Chlorides for Precipitation in LiCl-KCl Molten Salt by Oxygen Sparging

机译：氧气喷射法在LiCl-KCl熔盐中沉淀氯化稀土的氧化反应特性

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摘要

The precipitation reaction of some rare earth chlorides (La/Ce/Nd/GdCl_3) in a LiCl-KCl molten salt has been carried out by using the oxygen sparging method. In this study, regardless of the oxygen sparging time and the molten salt temperature, oxychlorides (REOCl) for LaCl_3, NdCl_3 and GdCl_3, and an oxide (REO_2) for CeCl_3 are formed as a precipitate. The conversion of rare-earth chlorides into insoluble precipitates was described by using a conversion ratio. The conversion ratio increased exponentially with the oxygen sparging time and finally showed asymptotic value at 1,023 K of the molten salt temperature condition. The conversion ratios of LaCl_3, NdCl_3 and GdCl_3 were increased with the molten salt temperature, however, even though the conversion ratio was increased from 0.660 to 0.995 with increasing molten salt temperature from 823 to 923 K at 60 min of a sparging time, the values of the conversion ratio of CeC_3 were nearly constant (over 0.999) with the molten salt temperature. As a result of the thermogravimetric analysis of the precipitates (oxychlorides), about 11-13% of a weight loss happened in the case of LaOCl, NdOCl and GdOCl, and all the oxychlorides were converted to their oxides i.e. La_2O_3, Nd_2O_3 and Gd_2O_3 at a high temperature and oxygen atmosphere.
机译：通过使用氧气喷射法，已经在LiCl-KCl熔融盐中进行了一些稀土氯化物（La / Ce / Nd / GdCl_3）的沉淀反应。在这项研究中，无论氧气喷射时间和熔融盐温度如何，都会形成LaCl_3，NdCl_3和GdCl_3的氯氧化物（REOCl）和CeCl_3的氧化物（REO_2）作为沉淀。通过使用转化率描述了稀土氯化物向不溶性沉淀物的转化。转化率随氧气喷射时间呈指数增长，并最终在熔融盐温度条件1,023 K处显示渐近值。 LaCl_3，NdCl_3和GdCl_3的转化率随熔盐温度的升高而增加，尽管在60分钟的喷射时间下，随着熔盐温度从823 K升高至923 K，转化率从0.660增至0.995，这些值熔融盐温度下，CeC_3的转化率几乎恒定（超过0.999）。对沉淀物（氧氯化物）进行热重分析的结果表明，在LaOCl，NdOCl和GdOCl的情况下，重量损失约为11-13％，并且所有的氧氯化物在60℃时都转化为其氧化物，即La_2O_3，Nd_2O_3和Gd_2O_3。高温和氧气气氛。

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