Crystallise it from H2O (4mL/g) by partial evaporation, and dry it above 130o in vacuo.
ChEBI: A metal sulfate in which the counterion is lithium and the ratio of lithium to sulfate is 2:1.
White crystalline powder
Lithium sulfate is prepared by neutralization of lithium hydroxide or lithium carbonate with sulfuric acid followed by crystallization:
2LiOH + H2SO4 → Li2SO4 + H2O
Li2CO3 + H2SO4 → Li2SO4 + CO2 + H2O
The product obtained from crystallization in a concentrated solution is the monohydrate, Li2SO4•H2O. Anhydrous salt is obtained by heating the monohydrate in a vacuum.
Lithium sulfate is used in making a special type of high strength glass. It
also is used in medicine as an antidepressant.