Ternary chloride fused salt with high-temperature thermal stability and preparation method thereof
A chloride and stability technology, applied in the field of ternary chloride molten salt and its preparation, can solve problems such as large vapor pressure
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[0028] Make sure that the equipment and consumables for preparing molten salt in the glove box, such as electronic balance (accuracy 0.001g), tweezers, weighing spoon, salt container, crucible tongs, are dry and clean for later use.
[0029] The experimental crucible was ultrasonically cleaned with acetone, deionized water, and alcohol, and dried in an oven, and then dried and stored in a glove box covered with an inert atmosphere for future use.
[0030] First, select the appropriate lattice stability parameters according to the characteristics of the system; evaluate and optimize the corresponding phase equilibrium and thermochemical data, and calculate the intermediate compound KCaCl with the help of first principles 3 The zero-point energy is used as the initial value of the next phase diagram optimization; select the appropriate thermodynamic model, use the phase diagram software to optimize the interaction coefficient of the corresponding phase, and repeat the calculation...
Embodiment 1
[0033] After calibrating the electronic balance (0.001g) and adjusting the level, weigh 26.7wt.% of NaCl, 7.7wt.% of KCl, and 65.6wt.% of CaCl in the glove box 2 .
[0034] placed in the pre-treated Al 2 o 3 In the crucible, stir and mix evenly, cover the corresponding crucible lid, put the crucible containing molten salt into a resistance furnace connected to the glove box, raise the temperature at a heating rate of 2.0°C / min, and keep the temperature at 100-300°C for 0.5 -10h, to remove the moisture that may remain in the molten salt.
[0035] Afterwards, the temperature was raised to 700°C at a heating rate of 4.0°C / min, kept at this temperature for 5 hours, poured out the molten salt in the molten state, and cooled naturally to room temperature for the test of melting point.
[0036] DSC is used to test the prepared ternary chloride molten salt system. The upper limit of the test temperature is 620°C, and the heating rate is 10°C / min. figure 1 As shown, the shape of th...
Embodiment 2
[0039] After calibrating the electronic balance (0.001g) and adjusting the level, weigh 24.0wt.% of NaCl, 10.0wt.% of KCl, and 66.0wt.% of CaCl in the glove box 2 .
[0040] placed in the pre-treated Al 2 o 3 In the crucible, stir and mix evenly, cover the corresponding crucible lid, put the crucible containing molten salt into a resistance furnace connected to the glove box, raise the temperature at a heating rate of 2.0°C / min, and keep the temperature at 100-300°C for 0.5 -10h, to remove the moisture that may remain in the molten salt.
[0041] Afterwards, the temperature was raised to 700°C at a heating rate of 4.0°C / min, kept at this temperature for 5 hours, poured out the molten salt in the molten state, and cooled naturally to room temperature for the test of melting point.
[0042] DSC is used to test the prepared ternary chloride molten salt system. The upper limit of the test temperature is 620°C, and the heating rate is 10°C / min. figure 2 As shown, the shape of ...
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