|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||Effect of Na2CO3 and/or K2CO3 Addition on the Thermal Stability of Solar Salt and Hitec
||Xianwei Hu, Guojun Che, Jiangyu Yu, Zhongning Shi, Bingliang Gao, Zhaowen Wang
|On-Site Speaker (Planned)
Solar salt(60%NaNO3-40%KNO3) and Hitec(7%NaNO3-53%KNO3-40%NaNO2) are two of important heat transfer and storage mediums. However, the thermal stability of the salts at high temperatures(higher than 600℃ for solar salt and 535℃ for Hitec) needs to be improved to achieve more effective application. In the present study, Na2CO3 and/or K2CO3 were added to the systems and the thermal stability was studied. It was found that with the addition of Na2CO3 and/or K2CO3, the thermal stability of solar salt at 650 and 700 ℃ was improved. Contrastively, Na2CO3 additive had better improving effect than K2CO3. Nevertheless, with the addition of Na2CO3 and/or K2CO3, the thermal stability of Hitec at 650℃ got worse. The results were explained from the view of the equilibrium shift between NO3- and NO2- in the melts.