Effects of temperature on conversion of Li2CO3 to LiOH in Ca（OH）2 suspension

The effects of temperature on the convecsion of Li2 CO3 Co LiOH in a Ca（OH）2 suspension were investigated. Li2CO3 microplates were used as the Li source. The results showed that Li2CO3 was converted to LiOH via in situ ion-exchange and dissolution-precipitation routes. The formation of mixed CaxLiz-2xCO3 inter- mediate species confirmed that at 25℃ need/e-like CaCO3 was formed heterogeneously on the Li2CO3 surface via in situ ion-exchange. At 60-100℃, isolated CaCO3 agglomerates were formed homogeneously via dissolution-precipitation. Temperature increases accelerated the dissolution and conversion of Li2 CO3 to LiOH, producing solutions with high [CO32-1][Ca^2＋] ratios; this favored homogeneous precipitation of isolated CaCO3 agglomerates,