Determination of Solubility, Supersolubility, and Metastable Zone Width of Li2CO3 in the LiCl–CaCl2–NdCl3–PrCl3–FeCl3 Solution Environment from 293.15 to 363.15 K

The turbidity technology was employed to determine the solubility, supersolubility, and metastable zone width of Li₂CO₃ in the mixed solution of the LiCl–CaCl₂–NdCl₃–PrCl₃–FeCl₃ environment over a temperature span from 293.15 to 363.15 K. The experimental data show that the solubility, supersolubility, and metastable zone width of Li₂CO₃ in a LiCl solution are mainly affected by temperature and concentration of LiCl solution. In addition, increasing the concentration of the Na₂CO₃ solution significantly alters the supersolubility and metastable zone width of Li₂CO₃. The addition of impurity ions (Ca²⁺, Nd³⁺, Pr³⁺, Fe³⁺) noticeably increases the solubility, supersolubility, and metastable zone width of Li₂CO₃. The effect mechanism of impurity ions on the solubility, supersolubility, and metastable zone width of Li₂CO₃ in solution is the salting out of LiCl and salting in of CaCl₂, NdCl₃, PrCl₃, and FeCl₃. Overall, this research provides fundamental data for the industrial-scale manufacture of Li₂CO₃ via crystallization technology.