Thermal stability of sodium nitrate–sodium nitrite melts: A Raman spectra study
Thermal stability of sodium nitrate–sodium nitrite melts: A Raman spectra study
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DOI：
10.1080/00387010.2018.1473444
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发表时间：
2018-08
影响因子：
1.7
通讯作者：
Hu Xianwei;Lina Yue;Yu Zongxin;Gao Bingliang;Shi Zhongning;Wang Zhaowen
中科院分区：
文献类型：
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作者：
Hu Xianwei;Lina Yue;Yu Zongxin;Gao Bingliang;Shi Zhongning;Wang Zhaowen
摘要硝酸钠-亚硝酸钠的熔融混合物是一种重要的传热和储存介质。研究这类熔体的热稳定性具有重要意义。利用拉曼光谱研究了空气环境下硝酸钠-亚硝酸钠熔体中硝酸盐和亚硝酸盐离子的平衡，并对熔体的热稳定性进行了分析。结果表明：当温度大于644 K时，当硝酸钠质量含量为90质量%时，硝酸盐离子含量随温度的升高略有下降；而当硝酸钠质量含量为10 ~ 80质量%时，硝酸盐离子含量随温度升高而升高。空气中亚硝酸钠的质量分数分别为15.22%、14.71%和14.60%时，熔体在644 K、762 K和880 K时的热稳定性最佳。本研究结果为优化熔盐的组成和提供适用于重要工业过程的熔盐混合物提供了基础。
Abstract A molten mixture of sodium nitrate–sodium nitrite is an important heat transfer and storage medium. It is important to research the thermal stability of such melts. In the present study, the equilibrium between nitrate and nitrite ion in sodium nitrate–sodium nitrite melts under air atmosphere was studied by Raman spectroscopy and the thermal stability of the melts was analyzed. The results show that when the temperature was greater than 644 K, for melts in which the weighted-in content of sodium nitrate is 90 mass %, the content of nitrate ion decreased slightly with temperature. However, for melts in which the weighted-in content of sodium nitrate was 10–80 mass %, the content of nitrate ion increased with temperature. Melts in which the weighted-in fraction of sodium nitrite were 15.22%, 14.71%, and 14.60% under air atmosphere showed optimal thermal stability at 644 K, 762 K, and 880 K, respectively. The findings of this study have provided a foundation for optimizing the composition of molten salts and for providing molten mixtures applicable to important industrial processes.