Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

In order to remove sulfate(SO₄^2-) and purify the Li₂CO₃, dissolution and recrystallization of crude Li₂CO₃ using distilled water and HCl solution was performed. When Li2CO3 was dissolved using distilled water, the amount of dissolved Li₂CO₃(wt.%) increased as the solution temperature decrease and showed about 1.50 wt.% at 2.5°C. In addition, when Na₂CO₃ was added and the Li₂CO₃ solution was recrystallized, the recrystallization(%) increased with increasing temperature, resulting in a 49.00 % at 95 ℃. On the other hand, when Li₂CO₃ was dissolved using HCl solution, there was no effect of reaction temperature. As the concentration of HCl solution increased, the amount of dissolved Li₂CO₃(wt.%) increased, indicating 7.10 wt.% in 2.0 M HCl solution. When the LiCl solution was recrystallized by adding Na₂CO₃, it exhibited a recrystallization(%) of 86.10 % at a reaction temperature of 70 ℃, and showed a sulfate ion removal(%) of 96.50 % or more. Finally, more than 99.10 % of Na and more than 99.90 % of sulfate were removed from the recrystallized Li₂CO₃ powder through water washing, and purified Li₂CO₃ with a purity of 99.10 % could be recovered.