Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (05): 50604-050604.doi: 10.11889/j.0253-3219.2014.hjs.37.050604


Preparation of FLiNaK molten salt

ZONG Guoqiang CHEN Bo ZHANG Long SUN Jiahong DONG Qun’an CHEN Wei XIAO Jichang   

  1. (Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China)
  • Received:2013-12-29 Revised:2014-02-15 Online:2014-05-10 Published:2014-05-08
  • Supported by:

    Thoriumbased Molten Salt Reactor


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.

Key words: FLiNaK molten salt, Preparation, Ammonium hydrogen fluoride, Recrystallization