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The phase diagrams of two binary system of NaNO3-Ca(NO3)2 and KNO3-Ca(NO3)2 were predicted by using experimental method, and the eutectic points of two binary mixed nitrates were obtained. The differenlial scanning calorimetry(DSC)test, thermal gravimetric(TG)analysis and cost analysis of the eutectic point materials were carried out. The research results showed that as high-temperature heat storage materials, KNO3-Ca(NO3)2 eutectic point molten salt has more significant advantages than NaNO3-Ca(NO3)2 eutectic point molten salt, which is possible to be used as high temperature heat carrier for solar thermal power plant and nuclear power plant. © 2018, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.
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