Mixed molten salt

with large heat capacity

low cost

low vapor pressure

low viscosity

wide using temperature range and so on

has become recognized as a considerable regenerative potential of the heat transfer medium.36 kinds of mixed carbonate molten salts were prepared by mixing potassium carbonate

lithium carbonate

sodium carbonate in accordance with different proportions.The melting point

decomposition temperature

and specific heat are measured by the analysis of the TGA and DSC curves.In addition

the fitting curves of specific heat are obtained.The results show that melting points of major ternary carbonate are close at around 400℃ and decomposition temperatures of most ternary carbonate are 800—850℃.Decomposition temperatures of some ternary carbonate are 900℃.During the measurement

it is necessary to pay attention to the phenomenon of segregation of some components in the cooling process.The specific heats of most carbonates fitted with quartic polynomial of temperature very well.