Solubility Measurement of Li2O in LiCl Molten Salt for Electro-Reduction Process

摘要

The change of Li2O solubility with the concentration of high heat-generating elements such as Cs and Sr was measured in a LiCl melt, which is generally used as an electrolyte medium in an electrolytic reduction step of pyrochemical processing. The change in Li2O solubility is one of the important parameters in the electrolytic reduction. High temperature filtration using a porous tube and acid-base titration were employed to measure the solubility of Li2O. The solubility of Li2O was found to be 8.8 wt. % in pure LiCl molten salt at 650 °C. The solubility slightly increased when SrCl2 (alkaline earth metal) was added to LiCl. In contrast, the addition of CsCl (alkali metal) significantly decreased the solubility.