Lithium carbonate recovered from the waste solution generated during the lithium secondary battery manufacturingprocess contains heavy metals such as cobalt, nickel, and manganese. In this study, the recrystallization of lithium carbonatewas performed to remove heavy metals contained in the powder and to increase the purity of lithium carbonate. First, theleaching efficiency of lithium carbonate according to pH in the aqueous hydrochloric acid solution was examined, and theeffect on the recrystallization of lithium carbonate according to the equivalent and concentration of sodium carbonate wasconfirmed. As the equivalent and concentration of sodium carbonate increased, the recovery rate of lithium carbonate improved.
And the SEM image showed that the crystal shape was changed depending on the reaction conditions with sodium carbonate.
Finally, the high purity lithium carbonate of 99.9% or more was recovered by washing with water.