Background: Possessing a series of advantages

such as low neutron absorption cross section

much lower vapor pressure and good heat transfer performance fluoride molten salts are widely used in the high-temperature hydrogen

solar storage

nuclear fuel and other energy fields. Among them

ternary mixture of LiF-NaF-KF (FLiNaK) is one of the most common candidate molten salt systems. Purpose: We aim to examine the effect of temperature

time

crucible material and fluoride reagents on the quality of the molten salt

and preliminarily master key process parameters for preparation of FLiNaK molten salt. Methods: The formation of FLiNaK molten salt was studied by a vacuum melting platform. The optional preparation conditions were obtained through the screening of melting temperature

timing

crucible material and fluorination reagent. Results: In the presence of NH4HF2

the oxygen content in FLiNaK salt could be controlled below 2×10?4. Metal ion impurities in molten salt

according to the general requirements of the quality standard for molten salt reactor

of which Be

Cu

Fe

Zr and Cd contents are less than 5×10?6. And impurities of sulfate and phosphate anions are less than 1×10?4 and 3×10?5

respectively. Conclusion: Using the present preparation method

the corrosion of furnace was greatly reduced. It was an efficient

low-cost

and safe process for the preparation of FLiNaK molten salt.Cited